CN113054984A

CN113054984A - Pressure-sensitive detection circuit, chip, system and pressure-sensitive detection method

Info

Publication number: CN113054984A
Application number: CN202110549103.3A
Authority: CN
Inventors: 秦涛; 张聪
Original assignee: Shanghai Aiwei Microelectronics Technology Co ltd
Current assignee: Shanghai Aiwei Microelectronics Technology Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2021-06-29
Anticipated expiration: 2041-05-20
Also published as: CN113054984B

Abstract

The invention provides a pressure-sensitive detection circuit, a chip, a system and a pressure-sensitive detection method, wherein the pressure-sensitive detection circuit comprises: the N gain amplification modules are used for receiving the analog electric signals output by the corresponding pressure sensors and performing gain amplification; the N-channel analog-to-digital conversion module is used for sequentially performing analog-to-digital conversion on the amplified signals output by the N gain amplification modules; the interrupt generation module is connected to the output end of the N-channel analog-to-digital conversion module, and is used for performing signal processing on digital signals sequentially output by the N-channel analog-to-digital conversion module and generating interrupt signals, wherein the interrupt signals comprise at least one of ADC interrupt signals, comparison interrupt signals and press interrupt signals; wherein N is a positive integer greater than or equal to 1. The pressure-sensitive detection circuit, the chip, the system and the pressure-sensitive detection method provided by the invention solve the problems of large interaction power consumption, data missing report, large cost and area and the like when the conventional pressure-sensitive detection chip interacts with an external host.

Description

Pressure-sensitive detection circuit, chip, system and pressure-sensitive detection method

Technical Field

The invention belongs to the technical field of pressure detection, and particularly relates to a pressure detection circuit, a pressure detection chip, a pressure detection system and a pressure detection method.

Background

The pressure sensing detection principle is that when a pressure sensor senses pressure, an analog electric signal is generated according to a certain rule, the analog electric signal is amplified and subjected to analog-to-digital conversion to generate a digital signal which is in direct proportion to the pressure, and the digital signal is subjected to algorithm processing and then can be used for recognizing pressing actions or sliding gestures.

At present, a great amount of pressure detection is used for key and gesture detection on devices such as mobile phones, TWS (true wireless stereo) earphones and household appliances which are particularly sensitive to power consumption and cost, and at the moment, high power consumption caused by pressure keys is a problem which has to be faced, and particularly when the pressure detection is used on electronic mobile devices such as TWS earphones and mobile phones, the problem of power consumption is more and more obvious.

The pressure-sensitive detection chip generally needs to monitor the change condition of the signal of the pressure sensor at regular time so as to quickly respond to the key or gesture operation which occurs at any time, and even if an external host is in a standby state, whether the pressure sensor is pressed or not needs to be monitored; when a press is detected, the pressure data is usually reported to an external host to execute a corresponding program.

At present, the interaction between the pressure detection chip and an external host is realized in two ways: one is a mode of storing pressure data by using a register and waiting for timing and active access of an external host, but the scheme has large interactive power consumption and is easy to cause data missing report; the other method is to integrate an MCU (microprocessor) in the pressure detection chip and actively transmit pressure data to an external host by using the MCU, but the scheme has the problems of large interaction power consumption, large chip cost and large area due to the existence of the MCU.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a pressure sensing detection circuit, a pressure sensing detection chip, a pressure sensing detection system and a pressure sensing detection method, which are used to solve the problems of the prior pressure sensing detection chip in interacting with an external host.

To achieve the above and other related objects, the present invention provides a pressure sensing circuit, including:

the N gain amplification modules are used for receiving the analog electric signals output by the corresponding pressure sensors and carrying out gain amplification on the analog electric signals;

the N-channel analog-to-digital conversion module is correspondingly connected to the output ends of the N gain amplification modules and is used for sequentially performing analog-to-digital conversion on the amplification signals output by the N gain amplification modules;

the interrupt generating module is connected to the output end of the N-channel analog-to-digital conversion module and is used for performing signal processing on digital signals sequentially output by the N-channel analog-to-digital conversion module and generating interrupt signals, wherein the interrupt signals comprise at least one of ADC interrupt signals, comparison interrupt signals and press interrupt signals;

wherein N is a positive integer greater than or equal to 1.

Optionally, the interrupt generating module includes: the filtering unit is connected to the output end of the N-channel analog-to-digital conversion module and is used for filtering the digital signals sequentially output by the N-channel analog-to-digital conversion module to generate N groups of pressure data;

when the interrupt signal comprises an ADC interrupt signal, the filtering unit generates the ADC interrupt signal after the N-channel analog-to-digital conversion module finishes N-channel sampling;

when the interrupt signal includes a comparison interrupt signal, the interrupt generation module further includes: the comparison unit is connected with the output end of the filtering unit and used for sequentially comparing N groups of pressure data with a comparison threshold value and generating a comparison interrupt signal when the pressure data is greater than the comparison threshold value;

when the interrupt signal includes a press interrupt signal, the interrupt generation module further includes: and the N pressing identification units are respectively connected to the output ends of the filtering units and used for carrying out effective pressing judgment according to the corresponding pressure data and generating pressing interrupt signals when effective pressing occurs.

Optionally, when the interrupt signal includes at least two of an ADC interrupt signal, a comparison interrupt signal, and a press interrupt signal, the interrupt generating module further includes: and the output selection unit is connected to the filtering unit and the output ends of the comparison unit and/or the N press identification units, and is used for selectively outputting at least one of the ADC interrupt signal, the comparison interrupt signal and the press interrupt signal.

Optionally, when the interrupt signal includes a comparison interrupt signal, the interrupt generating module further includes: the N comparison state storage units are connected to the output ends of the comparison units and used for storing the comparison state of the pressure data corresponding to each channel;

when the interrupt signal includes a press interrupt signal, the interrupt generation module further includes: and the N pressing state storage units are correspondingly connected to the output ends of the N pressing identification units and are used for storing the pressing states of the pressure data corresponding to each channel.

Optionally, the pressure sensing circuit further comprises: and the data storage module is connected to the output end of the filtering unit and used for storing N groups of pressure data into address units corresponding to N channels.

Optionally, the pressure sensing circuit further comprises: and the N compensation modules are correspondingly connected between the N gain amplification modules and the filtering unit and used for generating compensation signals according to the corresponding pressure data when no pressing occurs so as to compensate the analog electric signals.

Optionally, when N is greater than or equal to 2, one gain amplification module is used to replace the N gain amplification modules, and one compensation module is used to replace the N compensation modules; at this time, the pressure-sensitive detection circuit further includes: and the multiplexer is connected between the pressure sensor and the gain amplification module and is used for realizing time division multiplexing of the gain amplification module.

The invention also provides a pressure-sensitive detection chip, which comprises: the pressure sensing circuit according to any one of the above claims, wherein the pressure sensing circuit is connected to the outside through an input interface, an interrupt interface, and a communication interface.

The present invention also provides a pressure-sensitive detection system, including: the pressure detection chip is connected with the corresponding pressure sensor through an input interface and is connected with the external host through an interrupt interface and a communication interface; the external host is used for reading the stored pressure data in an active access mode to judge the pressing event after receiving the corresponding interrupt signal; and when the corresponding interrupt signal comprises at least one of a comparison interrupt signal and a press interrupt signal, the external host is also used for performing clear interrupt operation on the interrupt interface.

The invention also provides a pressure-sensitive detection method, which comprises the following steps:

acquiring an analog electrical signal generated by at least one pressure sensor; the pressure sensor generates the analog electric signal according to the deformation of the corresponding key acquired by the pressure sensor;

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; wherein the interrupt signal comprises at least one of an ADC interrupt signal, a comparison interrupt signal, and a press interrupt signal;

and outputting the interrupt signal.

Optionally, the pressure-sensitive detection method further includes: and after receiving the interrupt signal, the external host reads the pressure data in an active access mode and processes the data to realize the judgment of the pressing event.

Optionally, the pressure data generation method includes: and sequentially carrying out gain amplification, analog-to-digital conversion and filtering processing on the analog electric signal output by the pressure sensor, and generating and storing the pressure data.

Optionally, when the interrupt signal includes an ADC interrupt signal, the method of generating the ADC interrupt signal includes: when the analog electric signal subjected to gain amplification is subjected to analog-to-digital conversion, the ADC interrupt signal is generated after sampling of all channels is completed;

when the interrupt signal comprises a comparison interrupt signal, the method of generating the comparison interrupt signal comprises: comparing the pressure data to a comparison threshold and generating the comparison interrupt signal when the pressure data is greater than the comparison threshold;

when the interrupt signal includes a press interrupt signal, the method of generating the press interrupt signal includes: and judging effective pressing according to the pressure data, and generating the pressing interrupt signal when effective pressing occurs.

As described above, according to the pressure-sensitive detection circuit, the chip, the system and the pressure-sensitive detection method, the external host is enabled to read the pressure data in time by using the interrupt interaction mode so as to reduce the access times to a certain extent, and when no interrupt occurs, the external host can execute other programs or enter the sleep mode, so that the interaction power consumption between the pressure-sensitive detection chip and the external host is reduced, the interaction efficiency between the pressure-sensitive detection chip and the external host is improved, and the repeated reading or the missing reading of the pressure data is avoided; the invention also realizes that the external host reads the pressure data only when the external host is pressed by using a comparatively interrupted interactive mode, thereby further reducing the interactive power consumption between the pressure-sensitive detection chip and the external host; the invention also realizes that the external host reads the pressure data only when the pressure is effectively pressed by using a press interruption interactive mode, thereby further reducing the interactive power consumption between the pressure sensing detection chip and the external host and further avoiding false triggering; the invention can configure different interrupt interaction modes (at least one of ADC interrupt, comparison interrupt and press interrupt) between the pressure sensing detection chip and the external host aiming at different application scenes, thereby improving the interaction flexibility between the pressure sensing detection chip and the external host; the invention does not need to integrate MCU in the chip, thereby reducing the cost and area of the pressure-sensitive detection chip.

Drawings

Fig. 1 is a schematic circuit diagram of a pressure-sensitive detection system according to an embodiment of the invention.

Fig. 2 is a schematic circuit diagram of another circuit structure of the pressure-sensitive detection system according to an embodiment of the invention.

Fig. 3 is a schematic circuit diagram of a pressure-sensitive detection system according to a second embodiment of the present invention.

Fig. 4 is a schematic circuit diagram of a pressure-sensitive detection system according to a third embodiment of the present invention.

Fig. 5 is a schematic circuit diagram of a pressure-sensitive detection system according to a fourth embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of a pressure-sensitive detection system according to a fifth embodiment of the present invention.

Fig. 7 is a schematic circuit diagram of a pressure-sensitive detection system according to a sixth embodiment of the present invention.

Fig. 8 is a schematic circuit diagram of a pressure-sensitive detection system according to a seventh embodiment of the present invention.

Element number description: the device comprises a 10 pressure-sensitive detection chip, a 100 pressure-sensitive detection circuit, a 101 gain amplification module, a 102N channel analog-to-digital conversion module, a 103 interrupt generation module, a 1031 filtering unit, a 1032 comparison unit, a 1033 comparison state storage unit, a 1034 output selection module, a 1035 pressing identification unit, a 1036 pressing state storage unit, a 104 data storage module, a 105 compensation module, a 106 multiplexer, a 20 pressure sensor and a 30 external host.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Please refer to fig. 1 to 8. It should be noted that the drawings provided in the present embodiment are only schematic and illustrate the basic idea of the present invention, and although the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation, the form, quantity and proportion of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

Example one

As shown in fig. 1, the present embodiment provides a pressure sensing circuit, where the pressure sensing circuit 100 includes:

the N gain amplification modules 101 are configured to receive analog electrical signals output by corresponding pressure sensors and perform gain amplification on the analog electrical signals;

the N-channel analog-to-digital conversion module 102 is correspondingly connected to the output ends of the N gain amplification modules 101, and is configured to sequentially perform analog-to-digital conversion on the amplification signals output by the N gain amplification modules 101;

an interrupt generating module 103, connected to the output end of the N-channel analog-to-digital conversion module 102, configured to perform signal processing on the digital signals sequentially output by the N-channel analog-to-digital conversion module 102 and generate an interrupt signal, where the interrupt signal includes an ADC interrupt signal;

wherein N is a positive integer greater than or equal to 1.

In this example, as shown in fig. 1, the interrupt generating module 103 includes: and a filtering unit 1031, connected to the output end of the N-channel analog-to-digital conversion module 102, and configured to perform filtering processing on the digital signals sequentially output by the N-channel analog-to-digital conversion module 102 to generate N sets of pressure data, and generate an ADC interrupt signal after the N-channel analog-to-digital conversion module 102 completes sampling of N channels.

Specifically, the gain amplification module 101 is implemented by using a programmable gain amplifier, the N-channel analog-to-digital conversion module 102 is implemented by using a SAR ADC (successive approximation analog-to-digital converter), a Sigma-delta ADC (Sigma-delta analog-to-digital converter), a pipeline ADC (pipelined analog-to-digital converter), or a flash ADC (fast analog-to-digital converter), and the filtering unit 1031 is implemented by using at least one of an arithmetic mean filter, a weighted mean filter, a moving mean filter, a median filter, and a low-pass filter. In specific application, the number of the gain amplification modules is set according to the number of the actual pressure sensors, and the analog-to-digital conversion modules with corresponding channel numbers are selected; of course, when N is greater than or equal to 2, one gain amplification module may be used to replace N gain amplification modules; in this case, the pressure sensing circuit 100 further includes: and a multiplexer 106 connected between the pressure sensor 20 and the gain amplification module 101 for implementing time division multiplexing of the gain amplification module (as shown in fig. 2). In this example, the longest time required from sampling by the ADC to generating the ADC interrupt signal is related to the sampling rate, the number of channels, and the number of samples per channel, so the time to generate the ADC interrupt signal can be reduced by increasing the sampling rate; in practical applications, the generation time of the ADC interrupt signal can be set to about 200 μm in this way.

As an example, as shown in fig. 1, the pressure sensing circuit 100 further includes: and a data storage module 104, connected to the output end of the filtering unit 1031, for storing N sets of the pressure data in address units corresponding to the N channels. Specifically, the data storage module 104 is implemented by using a data register.

As an example, as shown in fig. 1, the pressure sensing circuit 100 further includes: and N compensation modules 105, correspondingly connected between the N gain amplification modules 101 and the filtering unit 1031, for generating compensation signals according to the corresponding pressure data when no compression occurs, so as to compensate the analog electrical signals. Specifically, when no pressing occurs, the compensation module 105 performs digital-to-analog conversion on the pressure data of the corresponding channel output by the filter unit 1031 to obtain a corresponding pressure measured value, and then compares the pressure measured value with zero to generate a pressure compensation value according to the comparison result (if the pressure measured value is greater than zero, a negative pressure compensation value is generated, and if the pressure measured value is less than zero, a positive pressure compensation value is generated), so as to compensate the analog electrical signal to make the value of the analog electrical signal zero when no pressing occurs, thereby calibrating the pressure sensor, avoiding measurement errors caused by long-time use of the pressure sensor, and improving the measurement accuracy. Alternatively, when N is greater than or equal to 2 and the pressure sensing circuit 100 includes only one gain amplifying module 101, one compensation module may be used to replace the N compensation modules, so as to implement time division multiplexing of the compensation module 105 (as shown in fig. 2).

Accordingly, as shown in fig. 1 and 2, the present embodiment further provides a pressure-sensitive detection chip 10, including: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 1 and 2, the present embodiment also provides a pressure-sensitive detection system including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving the ADC interrupt signal.

Correspondingly, the present embodiment further provides a pressure-sensitive detection method, including:

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; wherein the interrupt signal comprises an ADC interrupt signal;

and outputting the interrupt signal.

As an example, the pressure-sensitive detection method further includes: and after receiving the interrupt signal, the external host reads the pressure data in an active access mode and processes the data to realize the judgment of the pressing event.

As an example, the method of generating pressure data comprises: and sequentially carrying out gain amplification, analog-to-digital conversion and filtering processing on the analog electric signal output by the pressure sensor, and generating and storing the pressure data.

As an example, the method of generating the ADC interrupt signal includes: and when the analog electric signal subjected to gain amplification is subjected to analog-to-digital conversion, the ADC interrupt signal is generated after sampling of all channels is completed.

The working process of the pressure-sensing detection method of the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 1.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on the analog electric signals output by the pressure sensors 20 to generate and store N groups of pressure data, and generates and outputs an ADC (analog-to-digital converter) interrupt signal after completing sampling of N channels; after receiving the ADC interrupt signal, the external host 30 sequentially reads the pressure data of each channel stored in the pressure-sensitive detection chip 10, and performs data processing on the read pressure data of each channel, so as to determine a pressing event (e.g., no pressing event, false triggering event, long pressing event, single pressing event, two consecutive pressing events, etc.) of the current pressing state occurring at each pressure sensor. It should be noted that, in one sampling period, the pressure-sensitive detection chip 10 of this example enters the low power consumption mode after generating the ADC interrupt signal, so as to wait for the next sampling period to arrive; in addition, the pressure-sensitive detection chip 10 enters the low power consumption mode to perform the automatic clear interrupt operation on the interrupt Interface (INT), so in practical applications, the pressure-sensitive detection chip 10 in this example does not need to perform the clear interrupt operation on the interrupt Interface (INT) through an external host.

Example two

As shown in fig. 3 (taking N equal to 1 as an example), compared to the pressure-sensitive detection circuit according to the first embodiment, the interrupt generating module 103 of the present embodiment includes:

a filtering unit 1031, connected to the output end of the N-channel analog-to-digital conversion module 102, for performing filtering processing on the digital signals sequentially output by the N-channel analog-to-digital conversion module 102 to generate N sets of pressure data;

a comparing unit 1032, connected to the output end of the filtering unit 1031, configured to sequentially compare the N sets of pressure data with a comparison threshold, and generate a comparison interrupt signal when the pressure data is greater than the comparison threshold.

Specifically, the comparison unit 1032 is implemented by using a comparator; when N is greater than 1, the comparing unit 1032 may be implemented by using only one comparator, or may be implemented by using N comparators; when the N comparators are used for implementation, the comparison thresholds corresponding to the N comparators may be the same or different. In fact, when N is greater than 1, the comparing unit 1032 may further adopt comparators with a number greater than 1 and less than N, where at least part of the comparators are shared, and the comparison thresholds corresponding to the comparators may be the same or may be different. It should be noted that whether the comparison thresholds are the same and their values can be set according to practical applications, and usually, the comparison thresholds are set to be the same for the case where N is greater than 1. In the present example, whether a press occurs at the corresponding pressure sensor is determined by comparing the pressure data of each channel with a comparison threshold, and a comparison interrupt signal is generated when a press occurs; since the maximum time required from the occurrence of the press to the generation of the comparison interrupt signal is related to the operating frequency (scanning frequency) of the pressure-sensitive detection circuit 100, that is, the higher the operating frequency of the pressure-sensitive detection circuit 100, the shorter the time from the occurrence of the press to the generation of the comparison interrupt signal, in practical applications, the operating frequency of the pressure-sensitive detection circuit 100 may be set at about 100Hz to make the time from the occurrence of the press to the generation of the comparison interrupt signal as short as possible while satisfying the circuit operation requirements.

As an example, as shown in fig. 3, the interrupt generating module 103 further includes: and N comparison state storage units 1033 connected to the output end of the comparison unit 1032 and configured to store comparison states of the pressure data corresponding to each channel, so that when interaction is implemented, an external host may only read the pressure data corresponding to the pressure sensor where pressure occurs based on the comparison state of the pressure data of each channel, thereby improving interaction efficiency. Optionally, the comparison state storage unit 1033 is implemented by using a state register.

Accordingly, as shown in fig. 3, the present embodiment further provides a pressure-sensitive detection chip, where the pressure-sensitive detection chip 10 includes: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 3, the present embodiment further provides a pressure-sensitive detection system, including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving the comparison interrupt signal, and meanwhile, the external host 30 is further configured to perform an interrupt clearing operation on the interrupt interface.

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; wherein the interrupt signal comprises a comparison interrupt signal;

and outputting the interrupt signal.

As an example, the method of generating the comparison interrupt signal includes: compare the pressure data to a comparison threshold and generate the comparison interrupt signal when the pressure data is greater than the comparison threshold.

Next, the working process of the pressure-sensing detection method according to the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 3.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on the analog electrical signals output by the pressure sensors 20 to generate and store N groups of pressure data, the pressure-sensitive detection chip 10 further sequentially compares the N groups of pressure data with a comparison threshold value and stores the comparison state of each channel, and generates and outputs a comparison interrupt signal when the pressure data is greater than the comparison threshold value; after receiving the comparison interrupt signal, the external host 30 first reads the pressure data of the current channel based on the comparison state of the channel, and performs data processing on the read pressure data, so as to realize the pressing event judgment (such as a false trigger event, a long pressing event, a single pressing event, two consecutive pressing events and the like) on the current pressing state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface so as to output the comparison interrupt signal generated by the following channel.

EXAMPLE III

As shown in fig. 4 (taking N equal to 1 as an example), compared to the pressure-sensitive detection circuit according to the first embodiment, the interrupt generating module 103 of the present embodiment includes:

a filtering unit 1031, connected to the output end of the N-channel analog-to-digital conversion module 102, and configured to perform filtering processing on the digital signals sequentially output by the N-channel analog-to-digital conversion module 102 to generate N sets of pressure data, and generate an ADC interrupt signal after the N-channel analog-to-digital conversion module 102 completes sampling of N channels;

As an example, as shown in fig. 4, the interrupt generating module 103 further includes: and N comparison state storage units 1033 connected to the output end of the comparison unit 1032 and configured to store comparison states of the pressure data corresponding to each channel, so that when interaction is implemented, an external host may only read the pressure data corresponding to the pressure sensor where pressure occurs based on the comparison state of the pressure data of each channel, thereby improving interaction efficiency. Optionally, the comparison state storage unit 1033 is implemented by using a state register.

As an example, as shown in fig. 4, the interrupt generating module 103 further includes: an output selection module 1034, connected to the output ends of the filtering unit 1031 and the comparing unit 1032, and configured to select and output at least one of the ADC interrupt signal and the comparison interrupt signal, so as to improve the application flexibility of the pressure sensing detection circuit 100 and implement different interrupt interaction modes with an external host for different application scene configurations.

Accordingly, as shown in fig. 4, the present embodiment further provides a pressure-sensitive detection chip, where the pressure-sensitive detection chip 10 includes: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 4, the present embodiment further provides a pressure-sensitive detection system, including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving at least one of the ADC interrupt signal and the comparison interrupt signal, and meanwhile, the external host 30 is further configured to perform an interrupt clearing operation on the interrupt interface after receiving the comparison interrupt signal. In practical applications, the external host 30 may generate a corresponding interrupt configuration signal to control an interrupt interaction manner between the external host 30 and the pressure sensing chip 10, such as an ADC interrupt interaction manner, a comparative interrupt interaction manner, or an ADC interrupt and comparative interrupt interaction manner.

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; wherein the interrupt signal comprises an ADC interrupt signal and a comparison interrupt signal;

outputting the interrupt signal; of course, in a specific application, at least one of the ADC interrupt signal and the comparison interrupt signal may also be selectively output according to actual requirements. As an example, the pressure-sensitive detection method further includes: and after receiving the interrupt signal, the external host reads the pressure data in an active access mode and processes the data to realize the judgment of the pressing event.

As an example, the method of generating the ADC interrupt signal includes: when the analog electric signal subjected to gain amplification is subjected to analog-to-digital conversion, the ADC interrupt signal is generated after sampling of all channels is completed; the method for generating the comparison interrupt signal comprises the following steps: compare the pressure data to a comparison threshold and generate the comparison interrupt signal when the pressure data is greater than the comparison threshold.

Next, the working process of the pressure-sensing detection method according to the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 4.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on the analog electrical signals output by the pressure sensors 20 to generate and store N groups of pressure data, and generates an ADC (analog-to-digital converter) interrupt signal after completing sampling of N channels, the pressure-sensitive detection chip 10 further sequentially compares the N groups of pressure data with a comparison threshold value and stores the comparison state of each channel, and generates a comparison interrupt signal when the pressure data is greater than the comparison threshold value, and the pressure-sensitive detection chip 10 is controlled by an interrupt configuration signal to selectively output at least one of the ADC interrupt signal and the comparison interrupt signal; when the pressure-sensitive detection chip 10 selects to output the comparison interrupt signal, the external host 30, after receiving the comparison interrupt signal, first reads the pressure data of the current channel based on the comparison state of the channel, and performs data processing on the read pressure data, so as to realize the pressing event judgment (such as a false trigger event, a long pressing event, a single pressing event, a continuous two-time pressing event, and the like) on the current pressing state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface so as to facilitate the output of the comparison interrupt signal generated by the subsequent channel. It should be noted that, since the operation performed by the external host 30 after receiving the ADC interrupt signal is the same as that in the first embodiment, the description is omitted here.

Example four

As shown in fig. 5 (taking N equal to 1 as an example), compared to the pressure-sensitive detection circuit according to the first embodiment, the interrupt generating module 103 of the present embodiment includes:

n press recognition units 1035, respectively connected to the output end of the filter unit 1031, are configured to perform effective press determination according to the corresponding pressure data, and generate a press interrupt signal when an effective press occurs.

Specifically, the press recognition unit 1035 includes: a threshold comparing unit connected to the output end of the filtering unit 1031, for comparing the pressure data of the corresponding channel with a set threshold; and the duration judging unit is connected with the output end of the threshold comparing unit and is used for counting the times that the corresponding channel pressure data is greater than the set threshold and judging the current pressing to be effective pressing when the times are greater than the set times. In this example, since the longest time required from the occurrence of the press to the generation of the press interrupt signal is associated with the set number of times, that is, the larger the set number of times, the longer the time from the occurrence of the press to the generation of the press interrupt signal, in practical applications, the time can be set to 400ms by the set number of times.

As an example, as shown in fig. 5, the interrupt generating module 103 further includes: the N pressing state storage units 1036, correspondingly connected to the output ends of the N pressing identification units 1035, are configured to store the pressing states of the pressure data corresponding to each channel, so that when interaction is implemented, an external host can only read the pressure data corresponding to the pressure sensor where effective pressing occurs based on the pressing state of the pressure data of each channel, thereby improving interaction efficiency. Optionally, the pressed state storage unit 1036 is implemented by a state register.

Accordingly, as shown in fig. 5, the present embodiment further provides a pressure-sensitive detection chip, where the pressure-sensitive detection chip 10 includes: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 5, the present embodiment further provides a pressure-sensitive detection system, including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving a pressing interrupt signal, and meanwhile, the external host 30 is further configured to perform an interrupt clearing operation on an interrupt interface.

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; wherein the interrupt signal comprises a press interrupt signal;

and outputting the interrupt signal.

As an example, the method of generating the press interrupt signal includes: and judging effective pressing according to the pressure data, and generating the pressing interrupt signal when effective pressing occurs.

Next, the working process of the pressure-sensing detection method according to the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 5.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on the analog electrical signals output by the pressure sensors 20 to generate and store N groups of pressure data, the pressure-sensitive detection chip 10 further sequentially performs effective pressing judgment according to the N groups of pressure data and stores the pressing state of each channel, and generates and outputs a pressing interruption signal when effective pressing occurs; after receiving the pressing interrupt signal, the external host 30 first reads the pressure data of the channel based on the pressing state of the current channel, and performs data processing on the read pressure data, so as to realize pressing event judgment (such as a long pressing event, a single pressing event, two consecutive pressing events, and the like) on the current pressing state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface so as to output the pressing interrupt signal generated by the subsequent channel.

EXAMPLE five

As shown in fig. 6 (taking N equal to 1 as an example), compared to the pressure-sensitive detection circuit according to the first embodiment, the interrupt generating module 103 of the present embodiment includes:

and N press recognition units 1035, respectively connected to the output end of the filter unit 1032, for performing effective press judgment according to the corresponding pressure data, and generating a press interrupt signal when effective press occurs.

As an example, as shown in fig. 6, the interrupt generating module 103 further includes: the N pressing state storage units 1036, correspondingly connected to the output ends of the N pressing identification units 1035, are configured to store the pressing states of the pressure data corresponding to each channel, so that when interaction is implemented, an external host can only read the pressure data corresponding to the pressure sensor where effective pressing occurs based on the pressing state of the pressure data of each channel, thereby improving interaction efficiency. Optionally, the pressed state storage unit 1036 is implemented by a state register.

As an example, as shown in fig. 6, the interrupt generating module 103 further includes: an output selection unit 1034, connected to the output ends of the filtering unit 1031 and the N press identification units 1035, and configured to selectively output at least one of the ADC interrupt signal and the press interrupt signal, so as to improve the application flexibility of the pressure-sensitive detection circuit 100 and implement different interrupt interaction modes with respect to different application scenarios and external hosts.

Accordingly, as shown in fig. 6, the present embodiment further provides a pressure-sensitive detection chip, where the pressure-sensitive detection chip 10 includes: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 6, the present embodiment also provides a pressure-sensitive detection system, including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving at least one of the ADC interrupt signal and the pressing interrupt signal, and meanwhile, the external host 30 is further configured to perform an interrupt clearing operation on the interrupt interface after receiving the pressing interrupt signal. In practical applications, the external host 30 may generate a corresponding interrupt configuration signal to control an interrupt interaction manner between the external host 30 and the pressure-sensing chip 10, such as an ADC interrupt interaction manner between the external host 30 and the pressure-sensing chip 10, a press interrupt interaction manner, or an ADC interrupt and press interrupt interaction manner.

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; the interrupt signal comprises an ADC interrupt signal and a press interrupt signal;

outputting the interrupt signal; of course, in a specific application, at least one of the ADC interrupt signal and the press interrupt signal may be selectively output according to actual requirements.

As an example, the method of generating the ADC interrupt signal includes: when the analog electric signal subjected to gain amplification is subjected to analog-to-digital conversion, the ADC interrupt signal is generated after sampling of all channels is completed; the method for generating the press interrupt signal includes: and judging effective pressing according to the pressure data, and generating the pressing interrupt signal when effective pressing occurs.

Next, the working process of the pressure-sensing detection method according to the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 6.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on analog electric signals output by the pressure sensors 20 to generate and store N groups of pressure data, generates an ADC (analog-to-digital converter) interrupt signal after completing sampling of N channels, the pressure-sensitive detection chip 10 further performs effective pressing judgment and stores the pressing state of each channel according to the N groups of pressure data, generates a pressing interrupt signal when effective pressing occurs, and the pressure-sensitive detection chip 10 is controlled by an interrupt configuration signal to selectively output at least one of the ADC interrupt signal and the pressing interrupt signal; when the pressure-sensitive detection chip 10 selects to output the press interrupt signal, the external host 30, after receiving the press interrupt signal, first reads the pressure data of the current channel based on the press state of the channel, and performs data processing on the read pressure data, so as to determine the press event (such as a long press event, a single press event, two consecutive press events, etc.) of the current press state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface to facilitate the output of the press interrupt signal generated by the following channel. It should be noted that, since the operation performed by the external host 30 after receiving the ADC interrupt signal is the same as that in the first embodiment, the description is omitted here.

EXAMPLE six

As shown in fig. 7 (taking N equal to 1 as an example), compared to the pressure-sensitive detection circuit according to the first embodiment, the interrupt generating module 103 of the present embodiment includes:

a comparing unit 1032 connected to the output end of the filtering unit 1031, and configured to sequentially compare the N sets of pressure data with a comparison threshold, and generate a comparison interrupt signal when the pressure data is greater than the comparison threshold;

As an example, as shown in fig. 7, the interrupt generating module 103 further includes: n comparison state storage units 1033, respectively connected to the output ends of the comparison units 1032, for storing the comparison states of the pressure data corresponding to each channel; the N pressing state storage units 1036 are correspondingly connected to the output ends of the N pressing identification units 1035, and are configured to store the pressing states of the pressure data corresponding to each channel. In this example, through the design of the N comparison state storage units 1033 and the N pressing state storage units 1036, when interaction is implemented, the external host may only read the pressure data corresponding to the pressure sensor where pressing occurs based on the comparison state of each channel pressure data, and/or may only read the pressure data corresponding to the pressure sensor where effective pressing occurs based on the pressing state of each channel pressure data, so as to improve interaction efficiency. Optionally, the comparison state storage unit 1033 and the pressing state storage unit 1036 are implemented by using a state register.

As an example, as shown in fig. 7, the interrupt generating module 103 further includes: the output selection unit 1034 is connected to the output ends of the comparison unit 1032 and the N press identification units 1035, and is configured to select and output at least one of the comparison interrupt signal and the press interrupt signal, so as to improve the application flexibility of the pressure sensing detection circuit 100 and implement different interrupt interaction modes with an external host for different application scene configurations.

Accordingly, as shown in fig. 7, the present embodiment further provides a pressure-sensitive detection chip, where the pressure-sensitive detection chip 10 includes: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 7, the present embodiment also provides a pressure-sensitive detection system, including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving at least one of the comparison interrupt signal and the pressing interrupt signal, and the external host 30 is further configured to perform an interrupt clearing operation on the interrupt interface after receiving at least one of the comparison interrupt signal and the pressing interrupt signal. In practical applications, the external host 30 may generate a corresponding interrupt configuration signal to control an interrupt interaction manner between the external host 30 and the pressure-sensing chip 10, for example, an interaction manner between the external host 30 and the pressure-sensing chip 10 that employs interrupt comparison, an interaction manner that employs interrupt pressing, or an interaction manner that employs interrupt comparison and interrupt pressing simultaneously.

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; wherein the interrupt signal comprises a comparison interrupt signal and a press interrupt signal;

outputting the interrupt signal; of course, in a specific application, at least one of the comparison interrupt signal and the pressing interrupt signal may be selectively output according to actual requirements.

As an example, the method of generating the comparison interrupt signal includes: comparing the pressure data to a comparison threshold and generating the comparison interrupt signal when the pressure data is greater than the comparison threshold; the method for generating the press interrupt signal includes: and judging effective pressing according to the pressure data, and generating the pressing interrupt signal when effective pressing occurs.

Next, the working process of the pressure-sensing detection method according to the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 7.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on analog electric signals output by the pressure sensors 20 to generate and store N groups of pressure data, the pressure-sensitive detection chip 10 further sequentially compares the N groups of pressure data with a comparison threshold value and stores the comparison state of each channel, and generates a comparison interrupt signal when the pressure data is greater than the comparison threshold value, the pressure-sensitive detection chip 10 further sequentially performs effective pressing judgment according to the N groups of pressure data and stores the pressing state of each channel, and generates a pressing interrupt signal when effective pressing occurs, and the pressure-sensitive detection chip 10 is controlled by an interrupt configuration signal to select and output at least one of the comparison interrupt signal and the pressing interrupt signal; when the pressure-sensitive detection chip 10 selects to output the comparison interrupt signal, after receiving the comparison interrupt signal, the external host 30 first reads the pressure data of the current channel based on the comparison state of the channel, and performs data processing on the read pressure data, so as to realize the pressing event judgment (such as a false trigger event, a long pressing event, a single pressing event, two continuous pressing events and the like) on the current pressing state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface so as to facilitate the output of the comparison interrupt signal generated by the following channel; when the pressure-sensitive detection chip 10 selects to output the press interrupt signal, the external host 30, after receiving the press interrupt signal, first reads the pressure data of the current channel based on the press state of the channel, and performs data processing on the read pressure data, so as to determine the press event (such as a long press event, a single press event, two consecutive press events, etc.) of the current press state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface to facilitate the output of the press interrupt signal generated by the following channel.

EXAMPLE seven

As shown in fig. 8 (taking N equal to 1 as an example), compared to the pressure-sensitive detection circuit according to the first embodiment, the interrupt generating module 103 of the present embodiment includes:

As an example, as shown in fig. 8, the interrupt generating module 103 further includes: n comparison state storage units 1033, respectively connected to the output ends of the comparison units 1032, for storing the comparison states of the pressure data corresponding to each channel; the N pressing state storage units 1036 are correspondingly connected to the output ends of the N pressing identification units 1035, and are configured to store the pressing states of the pressure data corresponding to each channel. In this example, through the design of the N comparison state storage units 1033 and the N pressing state storage units 1036, when interaction is implemented, the external host may only read the pressure data corresponding to the pressure sensor where pressing occurs based on the comparison state of each channel pressure data, and/or may only read the pressure data corresponding to the pressure sensor where effective pressing occurs based on the pressing state of each channel pressure data, so as to improve interaction efficiency. Optionally, the comparison state storage unit 1033 and the pressing state storage unit 1036 are implemented by using a state register.

As an example, as shown in fig. 8, the interrupt generating module 103 further includes: an output selection unit 1034, connected to the output ends of the filtering unit 1031, the comparing unit 1032, and the N press identification units 1035, and configured to select and output at least one of the ADC interrupt signal, the comparison interrupt signal, and the press interrupt signal, so as to improve the application flexibility of the pressure-sensitive detection circuit 100 and implement interrupt interaction modes different from that of an external host configured for different application scenarios.

Accordingly, as shown in fig. 8, the present embodiment further provides a pressure-sensitive detection chip, where the pressure-sensitive detection chip 10 includes: the pressure-sensitive detection circuit 100 as described above; the pressure sensing circuit 100 is connected to the outside through an Input interface (Input), an interrupt Interface (INT), and a communication interface (TX/RX).

Accordingly, as shown in fig. 8, the present embodiment also provides a pressure-sensitive detection system, including: the pressure sensor system comprises N pressure sensors 20, the pressure sensing detection chip 10 and an external host 30, wherein the pressure sensing detection chip 10 is connected with the corresponding pressure sensor 20 through an Input interface (Input) and is connected with the external host 30 through an interrupt Interface (INT) and a communication interface (TX/RX); the external host 30 is configured to read the stored pressure data in an active access manner to determine a pressing event after receiving at least one of the ADC interrupt signal, the comparison interrupt signal, and the pressing interrupt signal, and the external host 30 is further configured to perform an interrupt clearing operation on the interrupt interface after receiving at least one of the comparison interrupt signal and the pressing interrupt signal. In practical applications, the external host 30 may control an interrupt interaction manner between the external host 30 and the pressure-sensitive detection chip 10 by generating a corresponding interrupt configuration signal, for example, an interaction manner using ADC interrupt between the external host 30 and the pressure-sensitive detection chip 10, or an interaction manner using comparative interrupt, or an interaction manner using press interrupt, or an interaction manner using both ADC interrupt and comparative interrupt, or an interaction manner using both ADC interrupt and press interrupt, or an interaction manner using both comparative interrupt and press interrupt, or an interaction manner using both ADC interrupt, comparative interrupt and press interrupt.

processing the analog electric signal, and generating corresponding pressure data and an interrupt signal; the interrupt signal comprises an ADC interrupt signal, a comparison interrupt signal and a press interrupt signal;

outputting the interrupt signal; of course, in a specific application, at least one of the ADC interrupt signal, the comparison interrupt signal and the press interrupt signal may be selectively output according to actual requirements.

As an example, the generating method of generating the ADC interrupt signal includes: when the analog electric signal subjected to gain amplification is subjected to analog-to-digital conversion, the ADC interrupt signal is generated after sampling of all channels is completed; the method for generating the comparison interrupt signal comprises the following steps: comparing the pressure data to a comparison threshold and generating the comparison interrupt signal when the pressure data is greater than the comparison threshold; the method for generating the press interrupt signal includes: and judging effective pressing according to the pressure data, and generating the pressing interrupt signal when effective pressing occurs.

Next, the working process of the pressure-sensing detection method according to the present embodiment will be described with reference to the pressure-sensing detection system shown in fig. 8.

The N pressure sensors 20 regularly acquire the current pressing states of the corresponding keys and generate analog electric signals corresponding to the current pressing states; the pressure-sensitive detection chip 10 sequentially performs gain amplification, analog-to-digital conversion and filtering processing on analog electric signals output by each pressure sensor 20 to generate and store N groups of pressure data, generates an ADC (analog-to-digital converter) interrupt signal after completing sampling of N channels, the pressure-sensitive detection chip 10 further sequentially compares the N groups of pressure data with a comparison threshold value and stores the comparison state of each channel, generates a comparison interrupt signal when the pressure data is greater than the comparison threshold value, the pressure-sensitive detection chip 10 further sequentially performs effective pressing judgment according to the N groups of pressure data and stores the pressing state of each channel, generates a pressing interrupt signal when effective pressing occurs, and the pressure-sensitive detection chip 10 is controlled by an interrupt configuration signal to selectively output at least one of the ADC interrupt signal, the comparison interrupt signal and the pressing interrupt signal; when the pressure-sensitive detection chip 10 selects to output the comparison interrupt signal, after receiving the comparison interrupt signal, the external host 30 first reads the pressure data of the current channel based on the comparison state of the channel, and performs data processing on the read pressure data, so as to realize the pressing event judgment (such as a false trigger event, a long pressing event, a single pressing event, two continuous pressing events and the like) on the current pressing state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface so as to facilitate the output of the comparison interrupt signal generated by the following channel; when the pressure-sensitive detection chip 10 selects to output the press interrupt signal, the external host 30, after receiving the press interrupt signal, first reads the pressure data of the current channel based on the press state of the channel, and performs data processing on the read pressure data, so as to determine the press event (such as a long press event, a single press event, two consecutive press events, etc.) of the current press state occurring at the corresponding pressure sensor, and then performs an interrupt clearing operation on the interrupt interface to facilitate the output of the press interrupt signal generated by the following channel. It should be noted that, since the operation performed by the external host 30 after receiving the ADC interrupt signal is the same as that in the first embodiment, the description is omitted here.

In summary, according to the pressure-sensitive detection circuit, the pressure-sensitive detection chip, the pressure-sensitive detection system and the pressure-sensitive detection method, the external host is enabled to read the pressure data in time by using the interrupt interaction mode so as to reduce the access times to a certain extent, and when no interrupt occurs, the external host can execute other programs or enter the sleep mode, so that the interaction power consumption between the pressure-sensitive detection chip and the external host is reduced, the interaction efficiency between the pressure-sensitive detection chip and the external host is improved, and the repeated reading or the missing reading of the pressure data is avoided; the invention also realizes that the external host reads the pressure data only when the external host is pressed by using a comparatively interrupted interactive mode, thereby further reducing the interactive power consumption between the pressure-sensitive detection chip and the external host; the invention also realizes that the external host reads the pressure data only when the pressure is effectively pressed by using a press interruption interactive mode, thereby further reducing the interactive power consumption between the pressure sensing detection chip and the external host and further avoiding false triggering; the invention can configure different interrupt interaction modes (at least one of ADC interrupt, comparison interrupt and press interrupt) between the pressure sensing detection chip and the external host aiming at different application scenes, thereby improving the interaction flexibility between the pressure sensing detection chip and the external host; the invention does not need to integrate MCU in the chip, thereby reducing the cost and area of the pressure-sensitive detection chip. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A pressure sensing circuit, comprising:

wherein N is a positive integer greater than or equal to 1.

2. The pressure sensing circuit of claim 1, wherein the interrupt generation module comprises: the filtering unit is connected to the output end of the N-channel analog-to-digital conversion module and is used for filtering the digital signals sequentially output by the N-channel analog-to-digital conversion module to generate N groups of pressure data;

3. The pressure sensing circuit of claim 2, wherein when the interrupt signal comprises at least two of an ADC interrupt signal, a compare interrupt signal, and a press interrupt signal, then the interrupt generation module further comprises: and the output selection unit is connected to the filtering unit and the output ends of the comparison unit and/or the N press identification units, and is used for selectively outputting at least one of the ADC interrupt signal, the comparison interrupt signal and the press interrupt signal.

4. The pressure sensing circuit of claim 2, wherein when the interrupt signal comprises a compare interrupt signal, then the interrupt generation module further comprises: the N comparison state storage units are connected to the output ends of the comparison units and used for storing the comparison state of the pressure data corresponding to each channel;

5. The pressure sensing circuit according to any of claims 2-4, further comprising: and the data storage module is connected to the output end of the filtering unit and used for storing N groups of pressure data into address units corresponding to N channels.

6. The pressure sensing circuit according to any of claims 2-4, further comprising: and the N compensation modules are correspondingly connected between the N gain amplification modules and the filtering unit and used for generating compensation signals according to the corresponding pressure data when no pressing occurs so as to compensate the analog electric signals.

7. The pressure sensing circuit according to claim 6, wherein when N is greater than or equal to 2, one gain amplification module is used to replace N gain amplification modules, and one compensation module is used to replace N compensation modules; at this time, the pressure-sensitive detection circuit further includes: and the multiplexer is connected between the pressure sensor and the gain amplification module and is used for realizing time division multiplexing of the gain amplification module.

8. A pressure-sensitive detection chip, characterized in that it comprises: the pressure sensing circuit of any of claims 1-7, wherein the pressure sensing circuit is externally connected through an input interface, an interrupt interface, and a communication interface.

9. A pressure sensing detection system, comprising: the pressure-sensitive detection system comprises N pressure sensors, a pressure-sensitive detection chip as claimed in claim 8 and an external host, wherein the pressure-sensitive detection chip is connected with the corresponding pressure sensors through an input interface and is connected with the external host through an interrupt interface and a communication interface; the external host is used for reading the stored pressure data in an active access mode to judge the pressing event after receiving the corresponding interrupt signal; and when the corresponding interrupt signal comprises at least one of a comparison interrupt signal and a press interrupt signal, the external host is also used for performing clear interrupt operation on the interrupt interface.

10. A pressure-sensitive detection method, characterized by comprising:

and outputting the interrupt signal.

11. The pressure-sensitive detection method according to claim 10, further comprising: and after receiving the interrupt signal, the external host reads the pressure data in an active access mode and processes the data to realize the judgment of the pressing event.

12. The pressure-sensitive detection method of claim 10, wherein the pressure data generation method comprises: and sequentially carrying out gain amplification, analog-to-digital conversion and filtering processing on the analog electric signal output by the pressure sensor, and generating and storing the pressure data.

13. The pressure sensing method of claim 12, wherein when the interrupt signal comprises an ADC interrupt signal, the method of generating the ADC interrupt signal comprises: when the analog electric signal subjected to gain amplification is subjected to analog-to-digital conversion, the ADC interrupt signal is generated after sampling of all channels is completed;