CN111273368B - Geomagnetic sensor circuit, circuit board and electronic equipment - Google Patents
Geomagnetic sensor circuit, circuit board and electronic equipment Download PDFInfo
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- CN111273368B CN111273368B CN202010071888.3A CN202010071888A CN111273368B CN 111273368 B CN111273368 B CN 111273368B CN 202010071888 A CN202010071888 A CN 202010071888A CN 111273368 B CN111273368 B CN 111273368B
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/40—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for measuring magnetic field characteristics of the earth
Abstract
The embodiment of the application provides a geomagnetic sensor circuit, a circuit board and electronic equipment, wherein the geomagnetic sensor circuit comprises a first magnetic sensor, a second magnetic sensor, an amplifier, an analog-to-digital converter and an interface unit; the first magnetic sensor is used for acquiring a first magnetic signal; the second magnetic sensor is used for acquiring a second magnetic signal, and the range of the magnetic signal acquired by the second magnetic sensor is larger than that of the magnetic signal acquired by the first magnetic sensor; the first magnetic sensor and the second magnetic sensor are both connected with the input end of the amplifier, and the amplifier is used for amplifying signals input into the amplifier; the analog-to-digital converter is used for acquiring the signal amplified by the amplifier and converting the amplified signal into a digital signal; the interface unit is used for acquiring the digital signal converted by the analog-to-digital converter and transmitting the digital signal. The method can support the measurement of small-range high precision and the measurement of large-range.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a geomagnetic sensor circuit, a circuit board and electronic equipment.
Background
The application of geomagnetic sensors in electronic devices is becoming more and more widespread, and geomagnetic sensors can detect the earth magnetic field and realize the function of indicating the direction. In electronic devices such as smart phones, applications of geomagnetic sensors are very abundant.
Disclosure of Invention
The embodiment of the application provides a geomagnetic sensor circuit, a circuit board and an electronic device, and can improve the measuring range of the geomagnetic sensor circuit.
The embodiment of this application still provides a geomagnetic sensor circuit, and it includes:
the first magnetic sensor is used for acquiring a first magnetic signal;
the second magnetic sensor is used for acquiring a second magnetic signal, and the range of the magnetic signal acquired by the second magnetic sensor is larger than that of the magnetic signal acquired by the first magnetic sensor;
the first magnetic sensor and the second magnetic sensor are both connected with the input end of the amplifier, and the amplifier is used for amplifying signals input into the amplifier;
the input end of the analog-to-digital converter is connected with the output end of the amplifier, and the analog-to-digital converter is used for acquiring the signal amplified by the amplifier and converting the amplified signal into a digital signal; and
and the interface unit is connected with the output end of the analog-to-digital converter and used for acquiring the digital signal converted by the analog-to-digital converter and transmitting the digital signal.
The embodiment of the present application further provides a circuit board, which includes:
a substrate;
the geomagnetic sensor circuit is arranged on the substrate and is the above-mentioned geomagnetic sensor circuit.
An embodiment of the present application further provides an electronic device, which includes:
a housing;
the circuit board is arranged in the shell and is the circuit board.
In this application embodiment, first magnetic force sensor can be used for measuring the magnetic signal of miniverrange, and second magnetic force sensor can be used for measuring the magnetic signal of wide-range, and the geomagnetic sensor circuit in this application embodiment both can support the measurement of miniverrange high accuracy, can support the measurement of wide-range again, can be suitable for more scenes, can enlarge the magnetic signal that first magnetic force sensor and second magnetic force sensor acquireed through the amplifier simultaneously to subsequent module can acquire more accurate data.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below.
Fig. 1 is a schematic diagram of a first structure of a geomagnetic sensor circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a second structure of a geomagnetic sensor circuit according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a third structure of a geomagnetic sensor circuit according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a fourth structure of a geomagnetic sensor circuit according to an embodiment of the present application.
Fig. 5 is a circuit schematic diagram of a geomagnetic sensor circuit according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a circuit board according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Fig. 8 is another schematic view of the electronic device shown in fig. 7.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present application.
The embodiment of the application provides a geomagnetic sensor circuit, a circuit board and an electronic device. The geomagnetic sensor circuit is explained in detail below.
Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of a geomagnetic sensor circuit according to an embodiment of the present application. The geomagnetic sensor circuit 100 includes a first magnetic sensor 122, a second magnetic sensor 124, an amplifier 140, an analog-to-digital converter 160, and an interface unit 180.
The first magnetic sensor 122 is configured to obtain a first magnetic signal, the second magnetic sensor 124 is configured to obtain a second magnetic signal, and a range of the magnetic signal obtained by the second magnetic sensor 124 is greater than a range of the magnetic signal obtained by the first magnetic sensor 122.
The amplifier 140 may be a buffer amplifier or a pre-amplifier, and the first magnetic sensor 122 and the second magnetic sensor 124 are connected to an input terminal of the amplifier 140, and the amplifier 140 is used for amplifying a signal inputted to the amplifier 140. For example, the first magnetic force signal and/or the second magnetic force signal may be amplified. The Amplifier (Pre Amplifier) 140 may be a fixed multiple Amplifier, such as 71 times. The amplifier 140 may also be a variable-rate amplifier, and different signals input to the amplifier 140 may be amplified by different rates according to requirements. Illustratively, the variable rate amplifier may be adjustable between 0-100 times.
An input terminal of an analog-to-digital Converter (a/D Converter) 160 is connected to an output terminal of the amplifier 140, and the analog-to-digital Converter 160 is configured to obtain the signal amplified by the amplifier 140 and convert the amplified signal into a digital signal.
The interface unit 180 is connected to the output end of the analog-to-digital converter 160, and the interface unit 180 is configured to obtain the digital signal converted by the analog-to-digital converter 160 and transmit the digital signal.
The first magnetic sensor 122 can be used for measuring magnetic signals of a small range, the second magnetic sensor 124 can be used for measuring magnetic signals of a large range, the geomagnetic sensor circuit 100 can support high-precision measurement of the small range and measurement of the large range, and is suitable for more scenes, and meanwhile, the amplifier 140 can amplify the magnetic signals acquired by the first magnetic sensor 122 and the second magnetic sensor 124, so that subsequent modules can acquire more accurate data.
Referring to fig. 2, fig. 2 is a schematic diagram of a second structure of a geomagnetic sensor circuit according to an embodiment of the present disclosure. The geomagnetic Sensor circuit 100 further includes a Temperature Sensor 132 (Temperature Sensor), the Temperature Sensor 132 is configured to obtain Temperature information of the geomagnetic Sensor circuit 100, and the Temperature Sensor 132 is connected to the interface unit 180. The interface unit 180 may be configured to acquire temperature information of the temperature sensor 132, and transmit the temperature information in association with the digital signal. In some other embodiments, the interface unit 180 may be further configured to obtain temperature information of the temperature sensor 132, adjust the digital signal according to the temperature information, and transmit the adjusted digital signal.
The temperature information collected by the temperature sensor 132 may be used to correct the results of the geomagnetic sensor circuit 100. The magnetic force signals obtained at different temperatures will be corrected differently. For example, when the temperature information is higher than the preset temperature information, the magnetic force signal is correspondingly decreased; when the temperature information is lower than the preset temperature information, the magnetic force signal is correspondingly increased. The temperature information acquired by the temperature sensor 132 may be used to correct the magnetic signal at the back end, or may be corrected in the geomagnetic sensor circuit 100 (e.g., the interface unit 180), and then transmitted to the back end after the correction is completed.
The temperature sensor 132 itself may also be used to correct the obtained temperature information of the geomagnetic sensor circuit 100. The obtained temperature information of the geomagnetic sensor circuit 100 may be corrected according to the ambient temperature of the geomagnetic sensor circuit 100. For example, when the ambient temperature is higher than the temperature information of the geomagnetic sensor circuit 100, the obtained temperature information of the geomagnetic sensor circuit 100 may be adjusted down correspondingly. When the ambient temperature is lower than the temperature information of the geomagnetic sensor circuit 100, the obtained temperature information of the geomagnetic sensor circuit 100 may be adjusted up. The temperature information of the geomagnetic sensor circuit 100 obtained may also be corrected according to the historical temperature of the geomagnetic sensor circuit 100. The obtained temperature information of the geomagnetic sensor circuit 100 may also be corrected according to a temperature curve of the current temperature information of the geomagnetic sensor circuit 100. For example, when the temperature curve is an ascending curve, the obtained temperature information of the geomagnetic sensor circuit 100 may be adjusted to be low. When the temperature curve is a descending curve, the obtained temperature information of the geomagnetic sensor circuit 100 can be adjusted to be higher. By the method, the precision of the acquired temperature information can be controlled within 0.1 ℃, and the test precision is improved.
The coil area of the second magnetic force sensor 124 may be larger than the coil area of the first magnetic force sensor 122 to achieve that the range of the magnetic force signal acquired by the second magnetic force sensor 124 is larger than the range of the magnetic force signal acquired by the first magnetic force sensor 122.
The number of coils of the second magnetic sensor 124 is smaller than that of the first magnetic sensor 122, so that the range of the magnetic force signal acquired by the second magnetic sensor 124 is larger than that acquired by the first magnetic sensor 122.
The coil area of the second magnetic sensor 124 may be larger than the coil area of the first magnetic sensor 122, and meanwhile, the number of coils of the second magnetic sensor 124 is smaller than the number of coils of the first magnetic sensor 122, so that the range of the magnetic signal acquired by the second magnetic sensor 124 is larger than the range of the magnetic signal acquired by the first magnetic sensor 122.
It should be noted that the second magnetic sensor 124 can also measure a large magnetic flux change, and the range of the magnetic signal acquired by the second magnetic sensor 124 is larger than that acquired by the first magnetic sensor 122, but the measurement accuracy may be smaller than that of the first magnetic sensor.
Referring to fig. 3, fig. 3 is a schematic diagram of a third structure of a geomagnetic sensor circuit according to an embodiment of the present disclosure. The geomagnetic sensor circuit 100 may further include a third magnetic sensor 126, where the third magnetic sensor 126 obtains a third magnetic signal, and the third magnetic signal is used to calculate a magnetic signal in cooperation with the first magnetic signal. The magnetic signal range obtained by the third magnetic signal is the same as the magnetic signal range obtained by the first magnetic sensor 122. The third magnetic signal can be matched with the first magnetic signal to realize high-precision detection, the detection can be carried out again when the value difference between the first magnetic signal and the third magnetic signal exceeds a threshold value, and the average value output or the multiplication of the average value and the corresponding weight output can be carried out when the value difference between the first magnetic signal and the third magnetic signal is within the threshold value range. For example, the first magnetic force signal has a weight of 0.6 and the third magnetic force signal has a weight of 0.4.
It can be understood that the first magnetic sensor 122, the second magnetic sensor 124, and the third magnetic sensor 126 can detect magnetic signals in three directions X \ Y \ Z, and it can also be understood that the first magnetic signal, the second magnetic signal, and the third magnetic signal all include magnetic signals in three directions X \ Y \ Z.
The interface unit 180 may include an I2C interface or an I3C interface. The geomagnetic sensor circuit 100 is electrically connected to other devices through the interface unit 180, and transmits the magnetic signal acquired by the geomagnetic sensor circuit 100 to other devices. For example, the geomagnetic sensor circuit 100 is electrically connected to the processor through the interface unit 180, and transmits the magnetic signal to the processor, and after the processor obtains the magnetic signal, the processor may adjust application programs, such as compass, game, and navigation application programs. The I3C interface has higher transmission speed, supports multiple working modes in power consumption and saves more power. In some embodiments, the Interface unit 180 may be a Serial Data Interface (Serial Data Interface).
The geomagnetic sensor circuit 100 may further include a Reset coil 134 (Reset coils), where the Reset coil 134 is used to restore the magnetic sensor element to a normal operating state under the action of a strong magnetic field, and the magnetic field generated by the Reset coil 134 is driven to restore the original performance of the sensor element, so as to effectively improve the test accuracy.
The geomagnetic sensor circuit 100 may further include a Test Coils 136 (Test Coils), and the Test Coils 136 are used to generate a reference magnetic field to Test the sensor elements for simple diagnosis.
The geomagnetic sensor circuit 100 may further include an on-chip Voltage Regulator 138 (Voltage Regulator), where the on-chip Voltage Regulator 138 supplies power to the internal circuits.
The geomagnetic sensor circuit 100 may further include a Reset unit 142 (Power-on Reset), the Reset unit 142 being configured to generate a signal to Reset and initialize the device register via a Power supply voltage ramp when the chip is powered on.
The geomagnetic sensor circuit 100 may further include an on-chip Clock Generator 144 (Clock Generator) for generating a Clock signal and providing the Clock signal to the internal circuit.
The geomagnetic sensor circuit 100 may further include a Power Down Control 146 for controlling the voltage.
It can be understood that the geomagnetic sensor circuit includes a geomagnetic sensor chip, specifically referring to fig. 4, and fig. 4 is a schematic diagram of a fourth structure of the geomagnetic sensor circuit provided in this embodiment of the present application. The geomagnetic sensor chip 190 includes the first magnetic sensor 122, the second magnetic sensor 124, an amplifier 140, an analog-to-digital converter 160, and an interface unit 180. It can also be understood that the geomagnetic sensor chip 190, the geomagnetic sensor chip 190 includes the first magnetic sensor 122, the second magnetic sensor 124, the amplifier 140, the analog-to-digital converter 160, and the interface unit 180 integrated in the geomagnetic sensor chip 190.
Certainly, the geomagnetic sensor circuit 100 in the above embodiments may be integrated in one geomagnetic sensor chip 190, so that the integration is higher, the size of the geomagnetic sensor circuit can be very small, the geomagnetic sensor chip does not occupy space, and the space utilization rate is improved.
Referring to fig. 5, fig. 5 is a circuit diagram of a geomagnetic sensor circuit according to an embodiment of the present disclosure. The geomagnetic sensor circuit 100 may include a geomagnetic sensor chip 190 and a peripheral matching circuit. Specifically, the geomagnetic sensor chip includes a power supply pin (VDD), a first reset pin (VCAP), a second reset pin (VPP), a TEST pin (TEST), a null pin (NC), communication pins (SDA, SCL), and a ground pin (VSA).
The second reset pin may be connected to a series resistor R2507 to reduce overshoot effects.
The power pin connects pull-up resistor R2515 and capacitor C2507 (1 uF) to ground for stabilizing the input voltage.
The first reset pin is connected to capacitor C2505 (4.7 uF) to ground, and also to the first voltage terminal (VIO 28-PMU). The first reset pin is a reset power supply pin of the geomagnetic Sensor device, an Anisotropic magnetoresistance effect (AMR) technical device is easily magnetized by an external magnetic field, and the first reset pin is discharged through a capacitor in chip design to be reset (reset), so that the influence of external magnetic field interference is eliminated. The reset current is 500-600 mA, and the holding time is 0.4uS, since the reset of the device will draw current from the capacitor terminal, a voltage drop (i.e. ripple) will occur at the first reset pin terminal. The reset strategy used by the geomagnetic sensor circuit 100 is to detect magnetic saturation before resetting. In the related art, some of the equipment platforms do not have a sensor hub (sensor hub), and need to use a G-sensor to assist, specifically, when it is detected that the data of the G-sensor is changed and the geomagnetism is not changed, it is determined that the geomagnetism is saturated, so that the device performs reset calibration, but the G-sensor needs to be turned on all the time. The other part of the platform adopts a fixed time interval for resetting, and the resetting is carried out once every 5 s. The reset strategy selected by the geomagnetic sensor circuit 100 in this embodiment is reset after magnetic saturation is detected, and the accuracy is higher, and meanwhile, the geomagnetic sensor circuit can be compatible with different platforms, and the reset can be performed after magnetic saturation is detected no matter whether the platform has a sensor center. It should be noted that magnetic saturation is considered when the detected magnetic flux is greater than 95% of the maximum range. The device platform may be understood as a chip platform of the electronic device 300, such as an MTK platform, a high-pass platform, and the like.
The AMR technology can be understood that when the external magnetic field forms a zero angle with the direction of the magnetic field built in the magnet, the resistance does not change with the change of the external magnetic field; however, when the external magnetic field and the built-in magnetic field of the magnet have a certain angle, the internal magnetization vector of the magnet can shift, and the sheet resistance is reduced, which is called anisotropic magnetoresistance effect.
The communication pins (SDA, SCL) are I2C or I3C communication pins, and the NC pin can select different I2C or I3C addresses by connecting high level and ground.
The embodiment of the present application further provides a circuit board, specifically referring to fig. 6, and fig. 6 is a schematic structural diagram of the circuit board provided in the embodiment of the present application. The circuit board 200 includes a substrate 220 and the geomagnetic sensor circuit 100. The geomagnetic sensor circuit 100 may be the geomagnetic sensor circuit 100 in any of the embodiments described above.
Capacitors (C2505, C2507) in the geomagnetic sensor circuit 100 are disposed close to the geomagnetic sensor chip, the geomagnetic sensor chip is far away from the device platform processor, and when the interface unit (e.g., I2C or I3C) is wired longer or close to the antenna, two signal lines (SDA, SCL) of the interface unit are wired in parallel, and meanwhile, ground lines are added to two sides of the two signal lines for protection, so as to prevent a near layer from generating high-speed signal lines and the like. When the geomagnetic sensor chip is used for the first time, a 0 ohm resistor is connected in series with the two signal lines, and the geomagnetic sensor chip is cancelled after a small-batch Process Verification Test (PVT) and meanwhile, the address conflict is prevented.
The circuit board 200 further includes a power supply module 230, the geomagnetic sensor circuit 100 includes a power supply pin, the power supply pin is connected to the power supply module 230 through a power supply trace 240, the circuit board 200 is further provided with a signal line 250, and the power supply trace 240 and the signal line 250 are arranged at an interval. Specifically, the method comprises the following steps:
1) When the current change range of the power supply wiring can reach 10mA, the safety distance between the power supply wiring and the surrounding signal wires is more than 3 mm;
2) When the change range of the power supply wiring current can reach 50mA, the safe distance between the power supply wiring current and the surrounding signal wires is more than 7 mm;
3) When the change range of the power supply wiring current can reach 100mA, the safety distance between the power supply wiring current and the surrounding signal wires is more than 10 mm;
4) When the current variation range of the power supply wiring can reach 200mA, the safety distance between the power supply wiring and the surrounding signal wires is more than 20 mm.
The geomagnetic sensor circuit 100 and the capacitor connected to the power pin thereof may be placed inside the shielding cover 260 (the main shielding cover or the single small shielding cover sealed around, the shielding cover may be made of cupronickel, etc.), and may be placed below the arched shielding bracket, so as to prevent the geomagnetic sensor circuit 100 and the capacitor connected to the power pin from being corroded after the liquid is fed into the apparatus.
The circuit board 200 is further provided with a preset magnetic component 270, and the geomagnetic sensor circuit 100 and the preset magnetic component 270 are arranged at an interval. The geomagnetic sensor circuit 100 is as far away from the magnetic device as possible, or the magnetic device is avoided, and the predetermined magnetic component 270 may include a magnetic device made of hard iron material, such as a receiver, a speaker, a magnetic switch, a shaft, a camera module, a vibration motor, a TV antenna, an inductor, a hall switch, and so on. In addition, the device containing soft iron material can be used for LCD, RF shielding frame, memory card seat, SIM card seat, various connectors, rotating shaft, battery, NFC antenna and other metal structural parts, etc. Before layout, the magnetic field intensity of each device can be measured by a probe to find a proper position. For example, the geomagnetic sensor circuit 100 may be provided at the periphery of the circuit board 200. The distance between the geomagnetic sensor circuit 100 and other magnetic devices may be specifically:
1) The safety distance between the magnetic switch device and the magnetic switch device is more than 20mm;
2) The safe distance between the loudspeaker and the loudspeaker is 10-20 mm;
3) The safe distance between the vibration motor and the vibration motor is more than 10 mm;
4) The safety distance between the camera module and the camera module is more than 10 mm;
5) The safety distance between the memory card seat and the memory card seat is more than 5 mm;
6) The safety distance between the magnetic shielding frame and the magnetic shielding frame is more than 10 mm;
7) The safe distance between the microphone and the receiver is more than 10 mm;
8) The safety distance between the inductor and the large inductor is more than 5 mm;
9) The safe distance of the rotating shaft is more than 10 mm;
10 More than 15mm from the NFC antenna;
11 5mm from the bending edge area of a soft magnetic material such as an LCD frame (if the requirement cannot be met, the LCD adopts a nonmagnetic material;
12 10mm away from the switching power supply.
The geomagnetic sensor circuit 100 of the present embodiment (geomagnetic sensor circuit after modification) has significant advantages over the geomagnetic sensor circuit in the related art (geomagnetic sensor circuit before modification). The geomagnetic sensor chip in the geomagnetic sensor circuit 100 of this embodiment adopts a high integration process, so that the integration is stronger and the volume is smaller. The first magnetic sensor, the second magnetic sensor and the third magnetic sensor in the geomagnetic sensor circuit 100 are used for measuring the magnetic field intensity, the first magnetic sensor and the third magnetic sensor are used for measuring a small range, high precision is achieved, the second magnetic sensor is used for measuring a large range, and the range is wide. The geomagnetic sensor circuit 100 adds temperature compensation to the temperature of 0.1 degree, so that the temperature compensation is more accurate. The geomagnetic sensor circuit 100 is internally packaged and shielded well, and has strong anti-interference capability and high reliability. The geomagnetic sensor circuit 100 supports a low power consumption mode, and consumes less power. The geomagnetic sensor circuit 100 is compatible with each device platform. The following table one is an exemplary example.
Table one: angular data
Standard deviation STDRV-X =0.140 in the X direction of the geomagnetic sensor after improvement, and standard deviation STDRV-X =0.171 in the X direction of the geomagnetic sensor before improvement; standard deviation STDRV-Y =0.223 in the Y direction of the geomagnetic sensor after improvement and before improvement, standard deviation STDRV-Y =0.152 in the Y direction of the geomagnetic sensor; standard deviation STDRV-Z =0.264 in the Z direction of the geomagnetic sensor after improvement and standard deviation STDRV-Z =0.187 before improvement; the improved geomagnetic sensor is higher in angle precision, and the performance of the improved geomagnetic sensor is obviously improved.
It should be noted that only a part of the signal lines and a part of the preset magnetic member are shown on the circuit board shown in the figure.
The embodiment of the application further provides electronic equipment, an electronic equipment shell and a circuit board, wherein the circuit board is installed in the shell, and the circuit board can be the circuit board in any embodiment.
The electronic device may be a mobile terminal such as a smart phone or a tablet computer, or may be a game device, an Augmented Reality (AR) device, a Virtual Reality (VR) device, a data storage device, an audio playing device, a video playing device, a wearable device, or other devices having a display device, where the wearable device may be a smart bracelet, smart glasses, a smart watch, a smart decoration, or the like. The following description will be given taking a mobile phone as an example of the electronic device. Referring to fig. 7 and 8 in detail, fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure, and fig. 8 is a schematic another side diagram of the electronic device shown in fig. 7. The electronic device 300 further includes a display screen 310, a housing 320, a motherboard 330, and a battery 340.
Wherein, the housing 320 includes a bezel 322 and a rear cover 324. The display screen 310 and the rear cover 324 are located at two opposite sides of the electronic device 300, and the electronic device 300 further includes a middle plate around which a bezel 320 is disposed, wherein the bezel 320 and the middle plate may form a middle frame of the electronic device 300. The middle plate and the frame 320 form a receiving cavity on each side of the middle plate, one of the receiving cavities receives the display screen 310, and the other receiving cavity receives the main board 330, the battery 340, and other electronic components or functional modules of the electronic device 300.
The middle plate may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The middle frame is used for providing a supporting function for the electronic elements or functional components in the electronic device 300 so as to mount the electronic elements or functional components in the electronic device 300 together. Functional components of the electronic device 300, such as a camera assembly, a receiver, a circuit board, and a battery, may be mounted on the center frame or main board 330 for fixation. It is understood that the material of the middle frame may include metal or plastic.
The main board 330 may be mounted on the middle frame. One or more of the functional components of a microphone, a speaker, a headphone interface, a camera assembly, an acceleration sensor, a gyroscope, and a processor may be integrated on the main board 330. Meanwhile, the display screen 310 may be electrically connected to the main board 330, so as to control the display of the display screen through the processor on the main board 330.
The battery 340 may be mounted on the center frame. Meanwhile, the battery 340 is electrically connected to the motherboard 330, so that the battery 340 supplies power to the electronic device 300. The main board 330 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 340 to the various electronic components in the electronic device 300.
The display screen 310 forms a display surface of the electronic device 300 for displaying information such as images, text, and the like. The Display screen 310 may be a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen.
The display screen 310 may be a shaped screen, and the display screen 310 may include a display area 312 and a non-display area 314. The display area 312 performs a display function of the display screen 310 for displaying information such as images and texts. The non-display area 314 does not display information, and the non-display area 314 is used for cooperating with the front camera module 382. For example, the non-display area 314 is a high-transmittance area, and the front camera module 382 can obtain an external image through the non-display area 314, such as taking a picture, taking a video, and the like. In some other embodiments, the display screen can be the full-face screen, that is, the front of the display screen is basically all display areas, the display areas of the display screen are consistent, and the front camera module can adopt the driving mechanism to make a video recording from the inside of the electronic equipment to the outside of the electronic equipment. The display area of display screen can also include main display area and vice display area, vice display area's luminousness is greater than main display area's luminousness, the leading module of making a video recording corresponds vice display area and sets up, if set up in vice display area's below, vice display area can cooperate main display area display image, when vice display area does not show image, the module of making a video recording can see through vice display area and make a video recording, exemplarily, the non-display area that figure 7 shows can be replaced by vice display area.
The electronic device 300 further includes a rear camera module 384, the rear cover 324 is provided with a light-transmitting area corresponding to the rear camera module 384, and the rear camera module 384 can obtain an external image through the light-transmitting area of the rear cover 324.
It is understood that the main board in this embodiment may be the circuit board in the above embodiment, and the circuit board in the above embodiment may also be other circuit boards in the electronic device.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying a number of the indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more.
The geomagnetic sensor circuit, the circuit board, and the electronic device provided in the embodiments of the present application are described in detail above. The principles and embodiments of the present application are described herein using specific examples, which are presented only to aid in the understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (12)
1. A geomagnetic sensor circuit, comprising a geomagnetic sensor chip, the geomagnetic sensor chip comprising:
the first magnetic sensor is used for acquiring a first magnetic signal;
the second magnetic sensor is used for acquiring a second magnetic signal, and the range of the magnetic signal acquired by the second magnetic sensor is larger than that of the magnetic signal acquired by the first magnetic sensor;
the third magnetic sensor is used for acquiring a third magnetic signal, the range of the magnetic signal acquired by the third magnetic sensor is the same as that of the magnetic signal acquired by the first magnetic sensor, and when the value difference between the first magnetic signal and the third magnetic signal is within a threshold value range, the magnetic signal is output by averaging or multiplying the magnetic signal by corresponding weight;
the first magnetic sensor, the second magnetic sensor and the third magnetic sensor are all connected with the input end of the amplifier, and the amplifier is used for amplifying signals input into the amplifier;
the input end of the analog-to-digital converter is connected with the output end of the amplifier, and the analog-to-digital converter is used for acquiring the signal amplified by the amplifier and converting the amplified signal into a digital signal; and
the interface unit is connected with the output end of the analog-to-digital converter and used for acquiring the digital signal converted by the analog-to-digital converter and transmitting the digital signal;
the first reset pin is used for being grounded through a first capacitor and is also used for being connected with a first voltage end, and when the geomagnetic sensor chip is in magnetic saturation, the first reset pin is discharged through the first capacitor to reset;
the second reset pin is connected with the series resistor and is used for receiving a reset signal through the series resistor;
the reset coil is used for enabling the magnetic sensor element to recover to a normal working state under the action of a strong magnetic field;
a test coil for generating a reference magnetic field to test the magnetic sensor element;
and the reset unit is used for generating a signal through a power supply voltage ramp to reset and initialize the equipment register when the geomagnetic sensor chip is electrified.
2. A geomagnetic sensor circuit according to claim 1, further comprising a temperature sensor, wherein the temperature sensor is configured to obtain temperature information of the geomagnetic sensor circuit, the temperature sensor is connected to the interface unit, and the interface unit is configured to obtain temperature information of the temperature sensor, correlate the temperature information with the digital signal, and transmit the correlated temperature information.
3. A geomagnetic sensor circuit according to claim 1, further comprising a temperature sensor, wherein the temperature sensor is configured to obtain current temperature information of the geomagnetic sensor circuit, the temperature sensor is connected to the interface unit, and the interface unit is configured to obtain temperature information of the temperature sensor, adjust the digital signal according to the temperature information, and transmit the adjusted digital signal.
4. A geomagnetic sensor circuit according to claim 1, wherein the amplifier is an adjustable magnification amplifier, and the amplifier is configured to amplify different signals input to the amplifier by different magnifications.
5. A geomagnetic sensor circuit according to claim 1, wherein a coil area of the second magnetic sensor is larger than a coil area of the first magnetic sensor;
and/or
The number of coils of the second magnetic force sensor is smaller than the number of coils of the first magnetic force sensor.
6. A geomagnetic sensor circuit according to claim 1, wherein the interface unit includes an I2C interface or an I3C interface.
7. A circuit board, comprising:
a substrate;
a geomagnetic sensor circuit disposed on the substrate, the geomagnetic sensor circuit being the geomagnetic sensor circuit according to any one of claims 1 to 6.
8. The circuit board according to claim 7, wherein a shielding cover is further disposed on the circuit board, and the geomagnetic sensor circuit is disposed in the shielding cover.
9. The circuit board of claim 7, wherein the interface unit comprises two signal lines, the two signal lines being arranged in parallel.
10. The circuit board of claim 7, wherein a predetermined magnetic component is further disposed on the circuit board, and the geomagnetic sensor circuit is spaced apart from the predetermined magnetic component.
11. The circuit board of claim 7, further comprising a power supply module, wherein the geomagnetic sensor circuit is connected to the power supply module through a power line, and the circuit board is further provided with a signal line, and the power line and the signal line are spaced apart from each other.
12. An electronic device, comprising:
a housing; and
a circuit board mounted in the housing, the circuit board being as claimed in any one of claims 7 to 11.
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| CN111273368A (en) | 2020-06-12 |
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