CN216207098U - Novel digital temperature sensor with variable resolution - Google Patents
Novel digital temperature sensor with variable resolution Download PDFInfo
- Publication number
- CN216207098U CN216207098U CN202122525162.5U CN202122525162U CN216207098U CN 216207098 U CN216207098 U CN 216207098U CN 202122525162 U CN202122525162 U CN 202122525162U CN 216207098 U CN216207098 U CN 216207098U
- Authority
- CN
- China
- Prior art keywords
- temperature sensor
- digital
- analog
- temperature
- cyclic redundancy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model relates to a novel digital temperature sensor with variable resolution, which comprises an analog temperature sensor, a band gap reference voltage source, an oscillator, a read-only memory, a nonvolatile erasable memory, an analog-to-digital converter, a linear corrector and a cyclic redundancy checker, wherein the digital temperature sensor adopts a single data line structure, the analog temperature sensor is the information input end of the digital temperature sensor, a voltage signal output by the analog temperature sensor is firstly received by the analog-to-digital converter and then converted into a digital signal, and then is connected with the linear corrector, and the cyclic redundancy checker outputs a cyclic redundancy check result signal and outputs the cyclic redundancy check result signal to the nonvolatile erasable memory. The integrated nonvolatile erasable memory and the analog-to-digital converter are convenient for realizing variable resolution, the integrated digital temperature sensor is small in size and small in occupied circuit board area, the simplification and miniaturization of a temperature measuring system are facilitated, and a single data line interface is more beneficial to a component sensor network.
Description
Technical Field
The utility model relates to the field of detection and control semiconductors, in particular to a novel digital temperature sensor with variable resolution.
Background
The temperature sensors applied at present are divided into analog temperature sensors and digital temperature sensors, wherein most of the analog temperature sensors are contact temperature sensors and must be in direct contact with a measured object, and the temperature of the measured object can be transmitted to the temperature sensors to achieve the purpose of temperature measurement. In addition, the contact type analog temperature sensor has a large volume and can only observe a specific object, so that the application field is limited. The more common contact sensors are pressure type thermometers, resistance type thermometers, bimetallic thermometers, glass liquid thermometers and the like.
The analog temperature sensor consumes more labor cost in the using process, and cannot realize high-efficiency, automatic and large-scale temperature measurement and monitoring.
Digital temperature sensors, also known as smart temperature sensors, were first introduced in the middle of the twentieth century or the years. The digital temperature sensor can convert the temperature analog quantity into digital quantity which is easy to be processed by an intelligent instrument, a computer and the like, and can realize real-time temperature measurement control through a corresponding software program, thereby improving the measurement efficiency and saving manpower and material resources.
Most temperature sensors have a measurement range of-40 ℃ to-125 ℃, and the measurement temperature range is small, so that the temperature sensors are not beneficial to use under more extreme conditions, and the temperature measurement range of the temperature sensors needs to be increased in the face of more complicated application conditions and more severe environmental conditions.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is that the existing analog temperature sensor consumes more labor cost in the using process and cannot realize high-efficiency, automatic and large-scale temperature measurement and monitoring, thereby providing a novel digital temperature sensor with variable resolution.
In order to solve the above technical problems, the present invention provides a novel digital temperature sensor with variable resolution, which comprises an analog temperature sensor, a bandgap reference voltage source, an oscillator, a read-only memory, a non-volatile erasable memory, an analog-to-digital converter, a linear corrector, a cyclic redundancy checker, the digital temperature sensor adopts a single data line structure, the analog temperature sensor is the information input end of the digital temperature sensor, the band-gap reference voltage source is respectively connected with the circuit modules of the digital temperature sensor in a power supply way, the non-volatile erasable memory stores the information of alarm temperature set value and temperature conversion resolution, the voltage signal output by the analog temperature sensor is firstly connected with an analog-to-digital converter and then converted into a digital signal, and then is connected with a linear corrector, the cyclic redundancy checker outputs a cyclic redundancy check result signal, and the cyclic redundancy check result signal is output to the nonvolatile erasable memory.
In an embodiment of the utility model, the scheme for configuring the circuit connection in the digital temperature sensor adopts a temperature sensing module based on a bipolar transistor, and when a bias current is injected into an emitter junction of the bipolar transistor, a V with a negative temperature coefficient is generatedBE(ii) a When two currents with constant current density ratio are injected into the collectors of two transistors, respectively, V of the two transistorsBEDifference of delta VBEIs a PTAT voltage VPTATThese temperature-closely related quantities V in bipolar transistorsBEAnd Δ VBEIs the basis of the temperature sensor.
In one embodiment of the utility model, the bandgap reference voltage source and the configuration circuit bias the voltage difference between the base and emitter of the bipolar transistors with different areas under the same current to be a positive temperature coefficient because the base and emitter of the bipolar transistor are in negative temperature coefficients.
In one embodiment of the utility model, the oscillator can generate a digital clock signal with low temperature drift, and provide an accurate clock reference for a circuit module of the digital temperature sensor, wherein the clock frequency is 550kHz, and the temperature coefficient is 68 ppm/DEG C.
In one embodiment of the utility model, the ROM comprises a 64-bit ROM comprising an 8-bit product single line series code, followed by a unique serial number for each device, for a total of 48 bits, with the last 8 bits being the cyclic redundancy check code of the first 56 bits of data.
In an embodiment of the utility model, the nonvolatile erasable memory can be programmed after being externally written into an upper computer.
In one embodiment of the utility model, the analog-to-digital converter comprises a sigma-delta analog-to-digital converter, the voltage output by the analog temperature sensor is converted into a digital signal, the analog-to-digital converter adopts a proprietary increment accumulation type architecture, variable speed and resolution without delay are realized, and 9-16 bit resolution can be set.
In an embodiment of the present invention, the linear corrector is configured to perform linear correction processing on the output of the analog-to-digital converter within the full temperature measurement range, so as to effectively ensure the linearity of the output result within the full temperature measurement range.
In one embodiment of the present invention, the cyclic redundancy checker generates a CRC cyclic redundancy check code, which is a data transmission error detection function, performs polynomial calculation on data, and attaches the obtained result to the rear of a data frame.
Compared with the prior art, the technical scheme of the utility model has the following advantages: this novel digital temperature sensor's data interface mainly has RS232 interface, RS485 interface, CAN bus interface, TCP/IP interface etc. compares in single data line interface, and other data line interfaces need more host computer IO mouth resources, and the peripheral circuit configuration of more complicacy, the temperature sensor of single data line interface only needs power cord, data line and ground wire CAN realize order receipt and data transmission's two-way communication function. The integrated digital temperature sensor has small volume and small occupied circuit board area, is favorable for realizing the simplification and the miniaturization of a temperature measuring system, and the single data line interface is more favorable for a component sensor network.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.
FIG. 1 is a schematic diagram of the principle structure of a novel integrated digital temperature sensor;
fig. 2 is a circuit schematic diagram of a novel integrated digital temperature sensor.
Detailed Description
As shown in fig. 1, this embodiment provides a novel digital temperature sensor with variable resolution, which includes an analog temperature sensor, a bandgap reference voltage source, an oscillator, a read-only memory, a non-volatile erasable memory, an analog-to-digital converter, a linear corrector, and a cyclic redundancy checker, where the digital temperature sensor adopts a single data line structure, the analog temperature sensor is an information input terminal of the digital temperature sensor, the bandgap reference voltage source is respectively connected to circuit modules of the digital temperature sensor for supplying power to provide a reference voltage with low temperature drift, the non-volatile erasable memory stores information of an alarm temperature setting value and temperature conversion resolution, after a system is powered off, the information is not lost, a voltage signal output by the analog temperature sensor is first received by the analog-to-digital converter and then converted into a digital signal, and the cyclic redundancy checker outputs a cyclic redundancy check result signal and outputs the cyclic redundancy check result signal to the nonvolatile erasable memory.
Furthermore, the measurement range is-55 ℃ to 150 ℃, the temperature measurement range of-55 ℃ to 125 ℃ of the traditional digital sensor is broken through, the temperature measurement precision is high, and the error in the temperature measurement range is only +/-2 ℃. Data transmission adopts single data line structure, only needs a data line can realize host computer and digital temperature sensor's two-way communication, and is small, and peripheral circuit design is simple, and the interference killing feature is strong, can easily establish temperature sensor network to have high low temperature transfinite alarming function. When the digital temperature sensor is used for measuring the temperature, the internal analog temperature sensor is used for sensing the temperature change and converting the temperature analog quantity into the voltage analog quantity. The analog-to-digital converter converts the voltage into digital quantity, adopts a special increment accumulation type framework, realizes variable speed and resolution without delay, and can set the resolution of 9-16 bits. The linear corrector performs linear correction on the digital quantity output by the analog-to-digital converter, and ensures the measurement precision and the measurement linearity in the full-temperature measurement range. The inner 64-bit ROM unit contains an 8-bit product single line series code, followed by a unique serial number for each device, for a total of 48 bits, with the last 8 bits being the CRC check code (cyclic redundancy check code) of the first 56 bits. And the nonvolatile erasable memory (EEPROM) is used for storing alarm temperature set values, temperature conversion resolution and the like, and information is not lost after the system is powered down.
Furthermore, the digital temperature sensor is produced and manufactured by adopting a silicon process, utilizes the temperature-related characteristic of the bipolar transistor and adopts a PTAT structure to realize the conversion of temperature analog quantity into digital quantity.
As shown in fig. 2, the connection scheme of the configuration circuit in the digital temperature sensor adopts a temperature sensing module based on a bipolar transistor, and when a bias current is injected into an emitter junction of the bipolar transistor, a V with a negative temperature coefficient is generatedBE(ii) a When two currents with constant current density ratio are injected into the collectors of two transistors, respectively, V of the two transistorsBEDifference of delta VBEIs a PTAT voltage VPTATThese temperature-closely related quantities V in bipolar transistorsBEAnd Δ VBEIs the basis of the temperature sensor.
The band-gap reference voltage source and the configuration circuit have the advantages that the base voltage and the emitter voltage of the bipolar transistor are in negative temperature coefficients, the voltage difference between the base voltage and the emitter voltage of the bipolar transistor biased in different areas under the same current is in positive temperature coefficients, and the base voltage and the emitter voltage are added under the condition that the temperature coefficients of the base voltage and the emitter voltage are the same, so that the reference voltage irrelevant to temperature can be obtained. The band-gap reference voltage circuit included in the utility model outputs 1.27V reference voltage, and the temperature coefficient of the reference voltage is 53.5 ppm/DEG C.
The oscillator can generate a digital clock signal with low temperature drift, provides accurate clock reference for a circuit module of the digital temperature sensor, and has the clock frequency of 550kHz and the temperature coefficient of 68 ppm/DEG C.
The read-only memory comprises a 64-bit read-only memory, and comprises 8-bit product single line series codes, then a unique serial number of each device, and 48 bits in total, wherein the last 8 bits are cyclic redundancy check codes of the first 56 bits of data.
The nonvolatile erasable memory can be programmed after being externally written into the upper computer, and the information of the alarm temperature set value and the temperature conversion resolution ratio is programmed and modified according to actual requirements.
The analog-to-digital converter comprises a sigma-delta analog-to-digital converter, the voltage output by the analog temperature sensor is converted into a digital signal, the analog-to-digital converter adopts a special increment accumulation type framework, the variable speed and the resolution without delay are realized, the 9-to-16 bit resolution can be set, and a user can configure different working modes according to requirements.
In the full-temperature measurement range of the linear corrector, linear errors exist after the analog temperature sensor converts the temperature analog quantity into the digital quantity. After the output of the analog-to-digital converter is subjected to linear correction processing, the linearity of an output result in a full-temperature measurement range can be effectively ensured, and meanwhile, the temperature measurement precision is improved.
The cyclic redundancy checker generates a CRC (cyclic redundancy check) cyclic redundancy check code, the cyclic redundancy check is a data transmission error detection function, polynomial calculation is carried out on data, an obtained result is attached to the back of a data frame, and the receiving equipment also executes a similar algorithm to ensure the correctness and the integrity of data transmission.
Further, when the digital temperature sensor receives a temperature transition command, the transition is started. The converted temperature values are stored in the scratch pad memory in 8-bit signed two's complement. The single chip microcomputer can read the data through the single-wire interface, and the high bit is behind and the low bit is in front during reading.
The control command and temperature data transmission of the host and the digital temperature sensor are completed by a single data interface. The host computer has an initialization time sequence, a reading time sequence and a writing time sequence for the control time sequence of the temperature sensor, the host computer initiates the control time sequence, the temperature sensor receives a command and completes corresponding actions, and the transmission of data and the command is in front of the low order.
The user can set the upper and lower temperature alarm limits TH and TL by himself (the temperature alarm is still stored after power failure). After the digital temperature sensor completes temperature conversion, the measured temperature value is automatically compared with the set upper limit value and the set lower limit value of high and low temperature, and if the temperature measurement result is higher than the set upper limit value or lower than the set lower limit value, the temperature sensor can send out warning data.
Each digital temperature sensor is provided with a unique 64-bit serial number, so that a plurality of temperature sensors can be mounted on a single data line, and a temperature monitoring network can be conveniently built. The temperature data is transmitted in a digital signal mode, the anti-interference capability is strong, the remote transmission can be realized, and the measurement precision and the system stability are improved.
The specific parameters of the novel digital temperature sensor are as follows:
working voltage: 3.3V-5.0V;
temperature measurement range: -55 ℃ to +150 ℃;
temperature measurement precision: @ 1 ℃ to 10 ℃ to 85 ℃ and @ 2 ℃ to 55 ℃ to 150 ℃;
ADC precision: 9-16 bit;
switching speed: less than or equal to 750 ms;
power supply current: IDD is less than or equal to 2 mA;
inputting high and low level voltage: VIH is more than or equal to 2.2V; VIL is less than or equal to 0.8V.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the spirit or scope of the utility model.
Claims (9)
1. A novel digital temperature sensor with variable resolution is characterized in that: the digital temperature sensor adopts a single data line structure, the analog temperature sensor is the information input end of the digital temperature sensor, the band gap reference voltage source is respectively connected with the circuit modules of the digital temperature sensor in a power supply mode, the nonvolatile erasable memory stores the information of alarm temperature set values and temperature conversion resolution ratios, voltage signals output by the analog temperature sensor are firstly received by the analog-to-digital converter and then converted into digital signals, and then the digital signals are connected with the linear corrector, and the cyclic redundancy checker outputs cyclic redundancy check result signals to be output to the nonvolatile erasable memory.
2. The novel variable resolution digital temperature sensor of claim 1, wherein: the connection scheme of the configuration circuit in the digital temperature sensor adopts a temperature sensing module based on a bipolar transistor, and when a bias current is injected into an emitter junction of the bipolar transistor, a V with a negative temperature coefficient is generatedBE(ii) a When two currents with constant current density ratio are injected into the collectors of two transistors, respectively, V of the two transistorsBEDifference of delta VBEIs a PTAT voltage VPTATThese temperature-closely related quantities V in bipolar transistorsBEAnd Δ VBEIs the basis of the temperature sensor.
3. The novel variable resolution digital temperature sensor of claim 1, wherein: the band-gap reference voltage source and the configuration circuit have the advantages that the voltages of the base stage and the emitter of the bipolar transistor are in negative temperature coefficients, and the voltage difference between the base stage and the emitter of the bipolar transistor biased in different areas under the same current is in positive temperature coefficients.
4. The novel variable resolution digital temperature sensor of claim 1, wherein: the oscillator can generate a digital clock signal with low temperature drift, provides accurate clock reference for a circuit module of the digital temperature sensor, and has the clock frequency of 550kHz and the temperature coefficient of 68 ppm/DEG C.
5. The novel variable resolution digital temperature sensor of claim 1, wherein: the read-only memory comprises a 64-bit read-only memory, and comprises 8-bit product single line series codes, then a unique serial number of each device, and 48 bits in total, wherein the last 8 bits are cyclic redundancy check codes of the first 56 bits of data.
6. The novel variable resolution digital temperature sensor of claim 1, wherein: the nonvolatile erasable memory can be externally connected with an upper computer and then programmed.
7. The novel variable resolution digital temperature sensor of claim 1, wherein: the analog-to-digital converter comprises a sigma-delta analog-to-digital converter, the voltage output by the analog temperature sensor is converted into a digital signal, the analog-to-digital converter adopts a special increment accumulation type framework, the variable speed and the resolution without delay are realized, and the 9-to-16-bit resolution can be set.
8. The novel variable resolution digital temperature sensor of claim 1, wherein: the linear corrector can effectively ensure the linearity of the output result in the full-temperature measurement range after the output of the analog-to-digital converter is subjected to linear correction processing in the full-temperature measurement range.
9. The novel variable resolution digital temperature sensor of claim 1, wherein: the cyclic redundancy checker generates a Cyclic Redundancy Check (CRC) code, the CRC code is a data transmission error detection function, polynomial calculation is carried out on data, and an obtained result is attached to the back of a data frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122525162.5U CN216207098U (en) | 2021-10-20 | 2021-10-20 | Novel digital temperature sensor with variable resolution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122525162.5U CN216207098U (en) | 2021-10-20 | 2021-10-20 | Novel digital temperature sensor with variable resolution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216207098U true CN216207098U (en) | 2022-04-05 |
Family
ID=80885110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122525162.5U Active CN216207098U (en) | 2021-10-20 | 2021-10-20 | Novel digital temperature sensor with variable resolution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216207098U (en) |
-
2021
- 2021-10-20 CN CN202122525162.5U patent/CN216207098U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102032974B (en) | Temperature compensation method for pressure sensor | |
| US6283628B1 (en) | Intelligent input/output temperature sensor and calibration method therefor | |
| CN204142381U (en) | Temperature measuring circuit | |
| CN216207098U (en) | Novel digital temperature sensor with variable resolution | |
| CN106556724A (en) | Ammeter and its clock correcting method | |
| CN101158604A (en) | Humiture measurement mechanism | |
| CN210719453U (en) | Thermal resistance temperature measuring device based on RS485 bus | |
| CN202939786U (en) | Wireless data acquisition device for mechanical property detection of concrete pole | |
| CN204389714U (en) | A kind of weather monitoring instrument realizing Temperature and Humidity based on SHT2X chip | |
| CN201247272Y (en) | Electronic type single-phase multi-fee-rate electric energy meter | |
| CN204346538U (en) | A kind of reservoir level remote supervision system | |
| CN207456644U (en) | A kind of mining temperature sensor | |
| CN113411085A (en) | Successive approximation type capacitance detection circuit | |
| CN214149638U (en) | Temperature detection circuit based on DS18B20 temperature sensor | |
| CN2601395Y (en) | Digitized weighting module | |
| CN209803234U (en) | Single-phase voltage digital display instrument | |
| CN215726432U (en) | Novel single-point temperature measurement circuit | |
| CN219328908U (en) | Meteorological data acquisition and transmission system | |
| CN220121183U (en) | DS18B 20-based digital display temperature measurement and control device | |
| CN115585890A (en) | Non-contact temperature measurement system | |
| CN215986458U (en) | Radio frequency-infrared meter calibrating device | |
| CN212622765U (en) | High-precision broadband digital display millivoltmeter based on STC89C52 | |
| CN210895057U (en) | Data acquisition system | |
| CN218156567U (en) | Electronic thermometer circuit | |
| CN218889650U (en) | Novel intelligent infant body temperature bracelet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |