CN214538295U - Open-leakage IO pin temperature sampling circuit - Google Patents
Open-leakage IO pin temperature sampling circuit Download PDFInfo
- Publication number
- CN214538295U CN214538295U CN202120707326.3U CN202120707326U CN214538295U CN 214538295 U CN214538295 U CN 214538295U CN 202120707326 U CN202120707326 U CN 202120707326U CN 214538295 U CN214538295 U CN 214538295U
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- electrically connected
- capacitor
- terminal
- 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.)
- Expired - Fee Related
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims description 101
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model relates to a temperature sampling technical field, concretely relates to open and leak IO pin and carry out temperature sampling circuit. The DC input circuit is electrically connected with the filter circuit, the filter circuit output end is respectively connected with the drive circuit input end and the signal circuit, the signal circuit is electrically connected with the control circuit, the drive circuit output end is electrically connected with the AC output circuit, the voltage of the AC output circuit is collected by the voltage collecting circuit, the current of the AC output circuit is collected by the current collecting circuit, the signal ends of the voltage collecting circuit and the current collecting circuit are both electrically connected with the control circuit, and the signal end of the temperature sampling circuit is electrically connected with the control circuit. The utility model provides a singlechip use when the condition inadequately at the AD sample connection, carry out the temperature sampling through two ordinary IO mouths of drain electrode open circuit type, fine must have solved also can read the temperature value under the condition that only has ordinary IO mouth.
Description
Technical Field
The utility model relates to a temperature sampling technical field, concretely relates to open and leak IO pin and carry out temperature sampling circuit.
Background
In many low-cost singlechips, do not have AD conversion module or AD conversion pin under the less not enough condition of using, if need increase the temperature sampling then need change the singlechip, the cost is very big like this, consequently, needs to develop a sampling circuit who has the temperature acquisition function under the condition of not changing current singlechip chip.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's not enough and defect, providing one kind in the system do not have AD sampling module and when needing to read the temperature value, can be accurate through two ordinary drain electrode open circuit type IO mouths and carry out the temperature sampling circuit with leaking IO pin of opening that reads the temperature value.
The purpose of the utility model is realized through the following technical scheme:
an open-drain IO pin temperature sampling circuit, comprising: filter circuit, drive circuit, control circuit, voltage sampling circuit, current sampling circuit, temperature sampling circuit and signal circuit, DC input line and filter circuit electric connection, the filter circuit output respectively with drive circuit input and signal circuit electric connection, signal circuit and control circuit electric connection, drive circuit output and AC output line electric connection, the voltage of AC output line is gathered to the voltage acquisition circuit, and the current of AC output line is gathered to the current acquisition circuit, and the signal end of voltage acquisition circuit and current acquisition circuit all with control circuit electric connection, the signal end and the control circuit electric connection of temperature sampling circuit.
Specifically, the driving circuit comprises three driving units with the same structure, the three driving units are connected in parallel, the filter circuit is electrically connected with the input ends of the three driving units respectively, and the output ends of the three driving units are electrically connected with the AC output line.
Specifically, the driving unit includes: a resistor R1, a resistor R3, a resistor R9, a resistor R12, a resistor R28, a capacitor C28, a MOS tube Q1, a MOS tube Q11 and a triode Q6, wherein the base of the triode Q6 is in signal connection with the control circuit through a resistor R3, specifically, the base of the triode Q6 of the first driving unit is in signal connection with a 16-pin signal of the control circuit singlechip U4 through a resistor R3, the base of the triode Q6 of the second driving unit is in signal connection with a 13-pin signal of the control circuit singlechip U4 through a resistor R3, the base of the triode Q6 of the third driving unit is in signal connection with a 17-pin signal of the control circuit singlechip U4 through a resistor R3, the emitter of the triode Q6 is grounded, the collector of the triode Q6 is in electrical connection with one end of the resistor R9 and the gate of the MOS tube Q1, the source of the MOS tube Q1 is in electrical connection with the other end of the resistor R9, one end of the resistor R1 and the output end of the filter circuit, the drain of the MOS transistor Q1 is electrically connected to the drain of the MOS transistor Q10, one end of the capacitor C28, one end of the resistor R28, and the collecting end of the voltage collecting module, specifically, the first driving unit is electrically connected to one end of R20 of the voltage collecting module, the second driving unit is electrically connected to one end of R21 of the voltage collecting module, the third driving unit is electrically connected to one end of R22 of the voltage collecting module, the gate of the MOS transistor Q11 is electrically connected to the control circuit through the resistor R12, specifically, the gate of the MOS transistor Q11 of the first driving unit is electrically connected to the 6-pin signal of the control circuit monolithic computer U4 through the resistor R12, the gate of the MOS transistor Q11 of the second driving unit is electrically connected to the 5-pin signal of the control circuit monolithic computer U4 through the resistor R13, the gate of the MOS transistor Q11 of the third driving unit is electrically connected to the monolithic computer 1-pin signal of the control circuit U4 through the resistor R14, the source of the MOS transistor Q11 is electrically connected to one end of the capacitor C31 and the AC output line, respectively, the other end of the capacitor C31 is electrically connected to the other end of the capacitor R28, and the other end of the resistor R1 is electrically connected to the other end of the capacitor C28.
Specifically, the voltage acquisition circuit comprises a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a capacitor C25, and a capacitor C25, an output end of the filter circuit is electrically connected with one end of the resistor R25, the other end of the resistor R25 is electrically connected with one end of the resistor R25, one end of the capacitor C25, and the control circuit respectively, specifically, the other end of the resistor R25 is electrically connected with a 14 pin of the control circuit singlechip U25, the other end of the resistor R25 is electrically connected with the other end of the capacitor C25, one end of the resistor R25, one end of the capacitor C25, and one end of the capacitor C25 are electrically connected with the ground, the other end of the resistor R25 is electrically connected with the other end of the capacitor C25, one end of the resistor R25 and the control circuit respectively, and the pin of the control circuit 3620, the other end of the resistor R20 is electrically connected with the driving circuit, specifically, the other end of the resistor R20 is electrically connected with the drain of a MOS transistor Q1 of one driving circuit, the drain of a MOS transistor Q10, one end of a capacitor C28 and one end of a resistor R28 respectively, the other end of the resistor R25 is electrically connected with the other end of a capacitor C16, one end of a resistor R21 and the control circuit respectively, specifically, the other end of the resistor R25 is electrically connected with a pin 3 of a singlechip U4 of the control circuit, the other end of the resistor R21 is electrically connected with the driving circuit, specifically, the other end of the resistor R21 is electrically connected with the drain of a MOS transistor Q1 of a second driving circuit, the drain of a MOS transistor Q10, one end of a capacitor C28 and one end of a resistor R28 respectively, the other end of the resistor R26 is electrically connected with the other end of a capacitor C17, one end of a resistor R22 and the control circuit respectively, specifically, the other end of the resistor R19 is electrically connected with a pin 2 of a singlechip U4, the other end of the resistor R22 is electrically connected to the driving circuit, and specifically, the other end of the resistor R22 is electrically connected to the drain of the MOS transistor Q1, the drain of the MOS transistor Q10, one end of the capacitor C28, and one end of the resistor R28 of the third driving circuit, respectively.
Specifically, the current sampling circuit includes a resistor R15, a resistor 16, a resistor 17, a resistor 18, a resistor 6, a comparator U2, a capacitor C4, and a capacitor C10, an AC output line is electrically connected to the resistor R16 and the resistor R15, the resistor R16 is electrically connected to the resistor R17 and grounded, the resistor R17 is electrically connected to the negative input terminals of the resistor R18, the capacitor C10, and the comparator U2, the resistor R15 is electrically connected to the positive input terminals of the capacitor C10 and the comparator U2, the other end of the resistor R18 is electrically connected to the output terminal of the comparator U2 and one end of the resistor R6, the other end of the resistor R6 is electrically connected to one end of the capacitor C4 and the control circuit, specifically, the other end of the resistor R6 is electrically connected to the pin of the control circuit U4, and the other end of the capacitor C4 is grounded.
Specifically, the temperature sampling circuit includes resistance R31, resistance R32, resistance R33 and electric capacity C21, resistance R31 one end and +5V power electric connection, the resistance R31 other end respectively with resistance R32 one end, resistance R33 one end, electric capacity C21 one end electric connection, electric capacity C21 other end ground connection, the resistance R32 other end and control circuit electric connection, the resistance R33 other end and control circuit electric connection, specifically, the resistance R32 other end and control circuit singlechip U4's 11 pin electric connection, the resistance R33 other end and control circuit singlechip U4's 12 pin electric connection.
Specifically, the control circuit includes singlechip U4, electric capacity C18, electric capacity C19 and electric capacity C20, singlechip U4 model is STM8A, 4 pins and the electric capacity C18 one end electric connection of singlechip U4, the other end ground connection of electric capacity C18, 8 pins and the electric capacity C19 one end electric connection of singlechip U4, 9 pins and the electric capacity C20 one end electric connection of singlechip U4 and with +5V power electric connection, the electric capacity C19 other end respectively with the electric capacity C20 other end, 7 pins electric connection and ground connection of singlechip U4, 15 pins and the signal circuit electric connection of singlechip U4.
Specifically, still include control power supply circuit, control power supply circuit input and filter circuit output electric connection, control power supply circuit output and control circuit electric connection.
Specifically, the programming circuit is further included, an input end of the programming circuit is electrically connected with an output end of the filter circuit, and the programming circuit is electrically connected with the control circuit.
Compared with the prior art, the utility model following advantage and beneficial effect are included:
the utility model provides a singlechip use when the condition inadequately at the AD sample connection, carry out the temperature sampling through two ordinary IO mouths of drain electrode open circuit type, fine must have solved also can read the temperature value under the condition that only has ordinary IO mouth.
Drawings
Fig. 1 is a circuit diagram of the voltage acquisition circuit of the present invention.
Fig. 2 is a circuit diagram of the control circuit and the signal circuit of the present invention.
Fig. 3 is a circuit diagram of the control power supply circuit of the present invention.
Fig. 4 is a circuit diagram of the filter circuit of the present invention.
Fig. 5 is a circuit diagram of the driving circuit and the current sampling circuit of the present invention.
Fig. 6 is a circuit diagram of the programming circuit of the present invention.
Fig. 7 is a circuit diagram of the temperature acquisition circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
As shown in fig. 1 to 7, an open-drain IO pin temperature sampling circuit includes: filter circuit, drive circuit 3, control circuit 1, voltage sampling circuit, current sampling circuit 4, temperature sampling circuit and signal circuit 2, DC input line and filter circuit electric connection, the filter circuit output respectively with drive circuit 3 input and signal circuit 2 electric connection, signal circuit 2 and control circuit 1 electric connection, 3 output and AC output line electric connection of drive circuit, voltage acquisition circuit gathers AC output line's voltage, current acquisition circuit gathers AC output line's electric current, voltage acquisition circuit and current acquisition circuit's signal end all with control circuit 1 electric connection, temperature sampling circuit's signal end and control circuit 1 electric connection. The filter circuit is used for rectifying and filtering a power supply, the control circuit 1 is used for controlling the start and stop of the drive circuit 3, the drive circuit 3 is used for controlling AC output, the voltage acquisition circuit is used for acquiring voltage on an AC output line, and the current acquisition circuit is used for acquiring current in the AC output line.
Specifically, the driving circuit 3 includes three driving units with the same structure, the three driving units are connected in parallel, the filter circuit is electrically connected to the input ends of the three driving units, and the output ends of the three driving units are electrically connected to the AC output line.
Specifically, the driving unit includes: a resistor R1, a resistor R3, a resistor R9, a resistor R12, a resistor R28, a capacitor C28, a MOS transistor Q1, a MOS transistor Q11 and a triode Q6, wherein the base of a triode Q6 is in signal connection with the control circuit 1 through a resistor R3, specifically, the base of a triode Q6 of the first driving unit is in signal connection with a 16-pin signal of the singlechip U4 of the control circuit 1 through the resistor R3, the base of a triode Q6 of the second driving unit is in signal connection with a 13-pin signal of the singlechip U4 of the control circuit 1 through the resistor R3, the base of a triode Q6 of the third driving unit is in signal connection with a 17-pin signal of the singlechip U4 of the control circuit 1 through the resistor R3, the emitter of the triode Q6 is grounded, the collector of the triode Q6 is in electrical connection with one end of the resistor R9 and the gate of the MOS transistor Q1, the source of the MOS transistor Q1 is in electrical connection with the other end of the resistor R9, one end of the resistor R1 and the output end of the filter circuit, the drain of the MOS transistor Q1 is electrically connected to the drain of the MOS transistor Q10, one end of the capacitor C28, one end of the resistor R28, and the collecting end of the voltage collecting module, specifically, the first driving unit is electrically connected to one end of R20 of the voltage collecting module, the second driving unit is electrically connected to one end of R21 of the voltage collecting module, the third driving unit is electrically connected to one end of R22 of the voltage collecting module, the gate of the MOS transistor Q11 is signal-connected to the control circuit 1 through the resistor R12, specifically, the gate of the MOS transistor Q11 of the first driving unit is signal-connected to the 6-pin of the control circuit 1 single chip microcomputer U4 through the resistor R12, the gate of the MOS transistor Q11 of the second driving unit is signal-connected to the 5-pin of the control circuit 1 single chip microcomputer U4 through the resistor R13, and the gate of the MOS transistor Q11 of the third driving unit is signal-connected to the 1-pin of the control circuit 1 single chip microcomputer U4 through the resistor R14, the source of the MOS transistor Q11 is electrically connected to one end of the capacitor C31 and the AC output line, respectively, the other end of the capacitor C31 is electrically connected to the other end of the capacitor R28, and the other end of the resistor R1 is electrically connected to the other end of the capacitor C28.
Referring to fig. 1, the voltage acquisition circuit includes a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a capacitor C25, and a capacitor C25, an output end of the filter circuit is electrically connected to one end of the resistor R25, another end of the resistor R25 is electrically connected to one end of the resistor R25, one end of the capacitor C25, and the control circuit 1, specifically, another end of the resistor R25 is electrically connected to the 14 pin of the control circuit 1, the another end of the resistor R25 is electrically connected to another end of the capacitor C25, one end of the resistor R25, one end of the capacitor C25, and one end of the capacitor C25 are electrically connected to ground, another end of the resistor R25 is electrically connected to another end of the control circuit 25, and the control circuit 1, specifically, the other end of the resistor R25 is electrically connected to the control pin of the control circuit 3620, the other end of the resistor R20 is electrically connected with the driving circuit 3, specifically, the other end of the resistor R20 is electrically connected with the drain of the MOS transistor Q1 of one driving circuit 3, the drain of the MOS transistor Q10, one end of the capacitor C28 and one end of the resistor R28 respectively, the other end of the resistor R25 is electrically connected with the other end of the capacitor C16, one end of the resistor R21 and the control circuit 1 respectively, specifically, the other end of the resistor R25 is electrically connected with the 3 pins of the singlechip U4 of the control circuit 1, the other end of the resistor R21 is electrically connected with the driving circuit 3, specifically, the other end of the resistor R21 is electrically connected with the drain of the MOS transistor Q1 of the second driving circuit 3, the drain of the MOS transistor Q10, one end of the capacitor C28 and one end of the resistor R28 respectively, the other end of the resistor R26 is electrically connected with the other end of the capacitor C17, one end of the resistor R22 and the control circuit 1 respectively, specifically, the other end of the resistor R19 is electrically connected with the 2 pins of the control circuit 1U 4, the other end of the resistor R22 is electrically connected to the driving circuit 3, and specifically, the other end of the resistor R22 is electrically connected to the drain of the MOS transistor Q1, the drain of the MOS transistor Q10, one end of the capacitor C28, and one end of the resistor R28 of the third driving circuit 3, respectively.
Referring to fig. 5, the current sampling circuit 4 includes a resistor R15, a resistor 16, a resistor 17, a resistor 18, a resistor 6, a comparator U2, a capacitor C4, and a capacitor C10, an AC output line is electrically connected to the resistor R16 and the resistor R15, the resistor R16 is electrically connected to the resistor R17 and grounded, the resistor R17 is electrically connected to the resistor R18, the capacitor C10, and a negative input terminal of the comparator U2, the resistor R15 is electrically connected to the positive input terminals of the capacitor C10 and the comparator U2, the other end of the resistor R18 is electrically connected to the output terminal of the comparator U2 and one end of the resistor R6, the other end of the resistor R6 is electrically connected to one end of the capacitor C4 and the control circuit 1, specifically, the other end of the resistor R6 is electrically connected to the pin 19 of the control circuit 1U 4, and the other end of the capacitor C4 is grounded.
Referring to fig. 7, the temperature sampling circuit includes a resistor R31, a resistor R32, a resistor R33, and a capacitor C21, one end of the resistor R31 is electrically connected to a +5V power supply, the other end of the resistor R31 is electrically connected to one end of a resistor R32, one end of a resistor R33, and one end of the capacitor C21, the other end of the capacitor C21 is grounded, the other end of the resistor R32 is electrically connected to the control circuit 1, the other end of the resistor R33 is electrically connected to the control circuit 1, specifically, the other end of the resistor R32 is electrically connected to an 11 pin of the singlechip U4 of the control circuit 1, and the other end of the resistor R33 is electrically connected to a 12 pin of the singlechip U4 of the control circuit 1. The utility model discloses an increase a reference resistance R32, a charge-discharge electric capacity C21 and a charging resistor R31, it is full of the electricity for charge-discharge electric capacity C21 through charging resistor R31, and record the discharge time when sampling resistor R33 discharges and the time when discharging of reference resistance R32, compare, through comparing the discharge time, can be more accurate reacing thermistor value, reachs the temperature after the singlechip is gathered. The circuit has low requirement on the precision of the capacitor, and the sampling accuracy depends on the reference resistor and the discharge threshold value.
Referring to fig. 2, the control circuit 1 includes a single chip microcomputer U4, a capacitor C18, a capacitor C19 and a capacitor C20, the model of the single chip microcomputer U4 is STM8A, a pin 4 of the single chip microcomputer U4 is electrically connected to one end of the capacitor C18, the other end of the capacitor C18 is grounded, a pin 8 of the single chip microcomputer U4 is electrically connected to one end of the capacitor C19, a pin 9 of the single chip microcomputer U4 is electrically connected to one end of the capacitor C20 and is electrically connected to a +5V power supply, the other end of the capacitor C19 is electrically connected to the other end of the capacitor C20 and a pin 7 of the single chip microcomputer U4 and is grounded, and a pin 15 of the single chip microcomputer U4 is electrically connected to the signal circuit 2.
Referring to fig. 3, the filter further includes a control power circuit, an input end of the control power circuit is electrically connected to an output end of the filter circuit, and an output end of the control power circuit is electrically connected to the control circuit 1. The control power supply circuit is used to control the operation of the circuit 1.
Referring to fig. 6, the apparatus further includes a programming circuit, an input terminal of the programming circuit is electrically connected to an output terminal of the filter circuit, and the programming circuit is electrically connected to the control circuit 1. The programming circuit is used for recording programs into the control circuit 1.
The utility model discloses a concrete implementation process as follows:
the method comprises the steps of firstly fully charging a capacitor C21 through a resistor R31, namely, the voltage at two ends of a capacitor C21 is a control power supply voltage, then discharging the capacitor through a thermistor R33, recording the discharging time of a thermistor R33 by reading the level of a feedback end resistor R32, thirdly, repeating the process of the first step to charge C21, fourthly, discharging the capacitor through a reference resistor R32, recording the discharging time of the reference resistor through the level of a port of a resistor R33, and comparing the discharging times, so that the thermistor value can be obtained accurately.
The method has no requirement on the precision of the capacitor, and can more accurately obtain the resistance value of the thermistor and further obtain the temperature.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. The utility model provides an open drain IO pin carries out temperature sampling circuit which characterized in that includes: filter circuit, drive circuit, control circuit, voltage sampling circuit, current sampling circuit, temperature sampling circuit and signal circuit, DC input line and filter circuit electric connection, the filter circuit output respectively with drive circuit input and signal circuit electric connection, signal circuit and control circuit electric connection, drive circuit output and AC output line electric connection, the voltage of AC output line is gathered to the voltage acquisition circuit, and the current of AC output line is gathered to the current acquisition circuit, and the signal end of voltage acquisition circuit and current acquisition circuit all with control circuit electric connection, the signal end and the control circuit electric connection of temperature sampling circuit.
2. The open-drain IO pin temperature sampling circuit of claim 1, wherein the driving circuit comprises three driving units with the same structure, and the three driving units are connected in parallel.
3. The open-drain IO pin temperature sampling circuit according to claim 2, wherein the driving unit comprises: a resistor R1, a resistor R3, a resistor R9, a resistor R12, a resistor R28 and a capacitor C28, the voltage detection circuit comprises a MOS tube Q1, a MOS tube Q11 and a triode Q6, wherein the base electrode of the triode Q6 is in signal connection with a control circuit after passing through a resistor R3, the emitter electrode of the triode Q6 is grounded, the collector electrode of the triode Q6 is electrically connected with one end of a resistor R9 and the grid electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is electrically connected with the other end of the resistor R9, one end of a resistor R1 and the output end of a filter circuit, the drain electrode of the MOS tube Q1 is electrically connected with the drain electrode of the MOS tube Q10, one end of a capacitor C28, one end of a resistor R28 and the collecting end of a voltage collecting module, the grid electrode of the MOS tube Q11 is in signal connection with the control circuit through a resistor R12, the source electrode of the MOS tube Q11 is electrically connected with one end of a capacitor C31 and an AC output circuit, the other end of a capacitor C31 is electrically connected with the other end of the capacitor R28, and the other end of the resistor R1 is electrically connected with the other end of the capacitor C28.
4. The open-drain IO pin temperature sampling circuit as claimed in claim 1, wherein the voltage sampling circuit includes a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C14, a capacitor C15, a capacitor C16 and a capacitor C17, the output terminal of the filter circuit is electrically connected to one terminal of the resistor R19, the other terminal of the resistor R19 is electrically connected to one terminal of the resistor R23, one terminal of the capacitor C14 and the control circuit, the other terminal of the resistor R23 is electrically connected to the other terminal of the capacitor C14, one terminal of the resistor R24, one terminal of the capacitor C15, one terminal of the resistor R25, one terminal of the capacitor C16, one terminal of the resistor R26, one terminal of the capacitor C17 and the ground, the other terminal of the resistor R24 is electrically connected to the other terminal of the capacitor C15, one terminal of the resistor R20 and the control circuit, the other terminal of the resistor R20 is electrically connected to the drive circuit, and the other terminal of the resistor R25 is electrically connected to the control circuit, the other terminal of the capacitor C16, respectively, One end of the resistor R21 is electrically connected with the control circuit, the other end of the resistor R21 is electrically connected with the drive circuit, the other end of the resistor R26 is electrically connected with the other end of the capacitor C17, one end of the resistor R22 and the control circuit, and the other end of the resistor R22 is electrically connected with the drive circuit.
5. The open-drain IO pin temperature sampling circuit according to claim 1, wherein the current sampling circuit comprises a resistor R15, a resistor 16, a resistor 17, a resistor 18, a resistor 6, a comparator U2, a capacitor C4 and a capacitor C10, an AC output line is electrically connected to the resistor R16 and the resistor R15, respectively, a resistor R16 is electrically connected to the resistor R17 and grounded, the resistor R17 is electrically connected to the resistor R18, the capacitor C10 and a negative input terminal of the comparator U2, the resistor R15 is electrically connected to the positive input terminal of the capacitor C10 and the positive input terminal of the comparator U2, the other end of the resistor R18 is electrically connected to the output terminal of the comparator U2 and one end of the resistor R6, the other end of the resistor R6 is electrically connected to one end of the capacitor C4 and the control circuit, and the other end of the capacitor C4 is grounded.
6. The open-drain IO pin temperature sampling circuit as claimed in claim 1, wherein the temperature sampling circuit comprises a resistor R31, a resistor R32, a resistor R33 and a capacitor C21, one end of the resistor R31 is electrically connected to a +5V power supply, the other end of the resistor R31 is electrically connected to one end of a resistor R32, one end of the resistor R33 and one end of a capacitor C21, the other end of the capacitor C21 is grounded, the other end of the resistor R32 is electrically connected to the control circuit, and the other end of the resistor R33 is electrically connected to the control circuit.
7. The open-drain IO pin temperature sampling circuit as recited in claim 1, wherein the control circuit comprises a single chip microcomputer U4, a capacitor C18, a capacitor C19 and a capacitor C20, the single chip microcomputer U4 is STM8A, the 4 th pin of the single chip microcomputer U4 is electrically connected with one end of the capacitor C18, the other end of the capacitor C18 is grounded, the 8 th pin of the single chip microcomputer U4 is electrically connected with one end of the capacitor C19, the 9 th pin of the single chip microcomputer U4 is electrically connected with one end of the capacitor C20 and is electrically connected with a +5V power supply, the other end of the capacitor C19 is electrically connected with the other end of the capacitor C20 and the 7 th pin of the single chip microcomputer U4 and is grounded, and the 15 th pin of the single chip microcomputer U4 is electrically connected with a signal circuit.
8. The open-drain IO pin temperature sampling circuit according to claim 1, further comprising a control power supply circuit, wherein an input terminal of the control power supply circuit is electrically connected to an output terminal of the filter circuit, and an output terminal of the control power supply circuit is electrically connected to the control circuit.
9. The open-drain IO pin temperature sampling circuit of claim 1, further comprising a programming circuit, wherein an input terminal of the programming circuit is electrically connected to an output terminal of the filter circuit, and the programming circuit is electrically connected to the control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120707326.3U CN214538295U (en) | 2021-04-08 | 2021-04-08 | Open-leakage IO pin temperature sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120707326.3U CN214538295U (en) | 2021-04-08 | 2021-04-08 | Open-leakage IO pin temperature sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214538295U true CN214538295U (en) | 2021-10-29 |
Family
ID=78273246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120707326.3U Expired - Fee Related CN214538295U (en) | 2021-04-08 | 2021-04-08 | Open-leakage IO pin temperature sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214538295U (en) |
-
2021
- 2021-04-08 CN CN202120707326.3U patent/CN214538295U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106125013B (en) | A kind of fast charge class Testing System of Product Aging of highly compatible | |
| CN1818684A (en) | Method and device for measuring battery internal resistance | |
| CN105897161A (en) | Outdoor photovoltaic module detection system based on dynamic capacitance charge and discharge and test method | |
| CN208350832U (en) | A kind of speed signal Acquisition Circuit and vehicle speed mileage device | |
| CN214538295U (en) | Open-leakage IO pin temperature sampling circuit | |
| CN219096505U (en) | Charging awakening detection circuit, battery management system and electric automobile | |
| CN102879749B (en) | Diamond fretsaw direct-current power supply test system | |
| CN104165903A (en) | Detection circuit for filtering net of air purifier and detection method | |
| CN208595999U (en) | A kind of force snesor calibrating installation | |
| CN112325462A (en) | Intelligent air conditioner metering module | |
| CN103407527B (en) | The information acquisition circuit of low-voltage electromobile | |
| CN218216729U (en) | Lithium battery management circuit | |
| CN216216022U (en) | Interactive high-temperature power supply battery short section | |
| CN113224810B (en) | Voltage acquisition device with hardware protection function for track traffic | |
| CN105158573A (en) | Battery internal resistance detection circuit and battery internal resistance detection method and apparatus | |
| CN103412204B (en) | A kind of servicing unit of electrical product plug discharge test | |
| CN110702962B (en) | Universal meter pen of digital multimeter with anti-error measurement function | |
| CN208581085U (en) | GPRS power supply circuit and its manufactured intellectual water meter | |
| CN208888339U (en) | A kind of fault detection system of application of solar energy circuit | |
| CN218181835U (en) | Memory for electric measuring meter | |
| CN215817612U (en) | BMS battery management system charge-discharge circuit based on battery management chip | |
| CN108844677A (en) | A kind of force snesor calibrating installation | |
| CN205882778U (en) | Storage battery detection and equalizing system | |
| CN109738827A (en) | Portable battery checks box and its application | |
| CN218330352U (en) | Sensor circuit based on data processing chip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211029 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |