CN215642446U - Power supply circuit of digital potentiometer - Google Patents
Power supply circuit of digital potentiometer Download PDFInfo
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- CN215642446U CN215642446U CN202122370995.9U CN202122370995U CN215642446U CN 215642446 U CN215642446 U CN 215642446U CN 202122370995 U CN202122370995 U CN 202122370995U CN 215642446 U CN215642446 U CN 215642446U
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- digital potentiometer
- power supply
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Abstract
The utility model relates to the field of digital potentiometers, in particular to a power supply circuit of a digital potentiometer, which realizes the capability of inputting and outputting alternating current signals of the digital potentiometer and greatly reduces the manufacturing cost. The utility model relates to a digital potentiometer power supply circuit, which comprises a first comparator, a second comparator and a reference voltage circuit unit, wherein the output end of the first comparator is connected with a clock signal pin of a digital potentiometer, and the output end of the second comparator is connected with a data signal pin of the digital potentiometer; the non-inverting input ends of the first comparator and the second comparator are connected with the control signal output end of the external control module, and the inverting input ends of the first comparator and the second comparator are connected with the reference voltage circuit unit. The utility model is suitable for digital potentiometers.
Description
Technical Field
The utility model relates to the field of digital potentiometers, in particular to a power supply circuit of a digital potentiometer.
Background
A digital potentiometer is an integrated circuit that replaces a conventional mechanical potentiometer. The device has the advantages of flexible use, high adjustment precision, no contact, low noise, less pollution, vibration resistance, interference resistance, small volume, long service life and the like, and can replace mechanical potentiometers in many fields. In many practical use scenarios, input and output of an ac signal are required. However, most digital potentiometer manufacturers adopt a forward power supply scheme, which can only adjust the magnitude of a forward signal, but output an abnormal alternating current signal.
In the prior art, a pizza (intel silicon) series digital potentiometer uses a positive power supply to supply power during use, and an adjustable resistance end of the potentiometer can input and output an alternating current signal. But the structure is complex, the cost is high, and the maintenance is very troublesome.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power supply circuit of a digital potentiometer, which realizes the capability of inputting and outputting alternating current signals of the digital potentiometer and greatly reduces the manufacturing cost.
The utility model adopts the following technical scheme to realize the purpose, and the digital potentiometer power supply circuit comprises a first comparator, a second comparator and a reference voltage circuit unit, wherein the output end of the first comparator is connected with a clock signal pin of the digital potentiometer, and the output end of the second comparator is connected with a data signal pin of the digital potentiometer; the non-inverting input ends of the first comparator and the second comparator are connected with the control signal output end of the external control module, and the inverting input ends of the first comparator and the second comparator are connected with the reference voltage circuit unit.
Furthermore, the power supply circuit of the digital potentiometer further comprises a third comparator, the output end of the third comparator is connected with an enable signal pin of the digital potentiometer, the non-inverting input end of the third comparator is connected with the control signal output end of the external control module, and the inverting input end of the third comparator is connected with the reference voltage circuit unit.
Furthermore, a plurality of resistors are connected in series between the control signal output end and the non-inverting input end of the first comparator, the second comparator or the third comparator.
Furthermore, the power supply circuit of the digital potentiometer also comprises a dual-power-supply module, and the dual-power-supply module is connected with the reference voltage circuit unit.
Further, the dual-power module comprises a linear voltage stabilizing chip and a charge pump chip, wherein the linear voltage stabilizing chip is used for adjusting the externally input a-volt voltage into a/2-volt voltage for output, the charge pump chip is used for carrying out voltage reversal on the a/2-volt output voltage and then outputting-a/2-volt voltage, and a is larger than 0.
Furthermore, the reference voltage circuit unit comprises a plurality of resistors connected in series, the plurality of resistors connected in series form a series circuit unit, one end of the series circuit unit is connected with the voltage output end of a/2 volt, and the other end of the series circuit unit is connected with the voltage output end of-a/2 volt.
Furthermore, the digital potentiometer power supply circuit further comprises a pull-up resistor, one end of the pull-up resistor is connected with the output end of the first comparator, the second comparator or the third comparator, and the other end of the pull-up resistor is connected with the voltage output end of a/2V.
Further, the voltage output end of the-a/2 volt is also connected with a grounding pin of the digital potentiometer, and the grounding pin of the digital potentiometer is also grounded through the first capacitor.
Further, the voltage output end of the a/2 volt is also connected with a working voltage pin of the digital potentiometer, and the working voltage pin of the digital potentiometer is also grounded through a second capacitor.
The utility model changes the positive power supply of the prior digital potentiometer into alternating current power supply through the comparator, has simple structure, realizes the input and output of alternating current signals at the resistance end of the digital potentiometer, greatly increases the model selection range of the digital potentiometer in the circuit, enhances the replaceability of the functional device, and is beneficial to the change, purchase and cost control of products.
Drawings
FIG. 1 is a circuit configuration diagram of a dual power module of the present invention.
Fig. 2 is a block diagram of the power supply circuit of the digital potentiometer of the present invention.
Detailed Description
The utility model discloses a power supply circuit of a digital potentiometer, which comprises a first comparator, a second comparator and a reference voltage circuit unit, wherein the output end of the first comparator is connected with a clock signal pin of the digital potentiometer, and the output end of the second comparator is connected with a data signal pin of the digital potentiometer; the non-inverting input ends of the first comparator and the second comparator are connected with the control signal output end of the external control module, and the inverting input ends of the first comparator and the second comparator are connected with the reference voltage circuit unit.
The digital potentiometer power supply circuit further comprises a third comparator, the output end of the third comparator is connected with an enabling signal pin of the digital potentiometer, the in-phase input end of the third comparator is connected with the control signal output end of the external control module, and the reverse phase input end of the third comparator is connected with the reference voltage circuit unit.
And a plurality of resistors are connected in series between the control signal output end and the non-inverting input end of the first comparator, the second comparator or the third comparator.
The digital potentiometer power supply circuit further comprises a dual-power-supply module, and the dual-power-supply module is connected with the reference voltage circuit unit.
The dual-power module comprises a linear voltage stabilizing chip and a charge pump chip, wherein the linear voltage stabilizing chip is used for adjusting a-volt voltage input from the outside into a/2-volt voltage output, the charge pump chip is used for carrying out voltage turnover on the a/2-volt output voltage and then outputting-a/2-volt voltage, and a is larger than 0.
The reference voltage circuit unit comprises a plurality of resistors which are connected in series, the resistors which are connected in series form a series circuit unit, one end of the series circuit unit is connected with the voltage output end of a/2V, and the other end of the series circuit unit is connected with the voltage output end of a/2V.
The digital potentiometer power supply circuit further comprises a pull-up resistor, one end of the pull-up resistor is connected with the output end of the first comparator, the second comparator or the third comparator, and the other end of the pull-up resistor is connected with the voltage output end of a/2V.
The voltage output terminal of the a/2 volt is also connected to the ground pin of the digital potentiometer, which is also grounded via the first capacitor.
The voltage output end of the a/2 volt is also connected with a working voltage pin of the digital potentiometer, and the working voltage pin of the digital potentiometer is also grounded through a second capacitor.
The structure diagram of the power supply circuit of the digital potentiometer is shown in fig. 2, a clock signal pin SCK of a digital potentiometer U2 is connected with an output end of a first comparator U4B, a non-inverting input end of the first comparator U4B is connected with a control signal output end of an external control module, the control signal output end outputs an MCU control signal B, two resistors with the resistance size of 5.1K (i.e. 5.1 kilo-ohm) are further connected in series between the non-inverting input end of the first comparator U4B and the control signal output end of the external control module, an inverting input end of the first comparator U4B is connected with a reference voltage circuit unit, the reference voltage circuit unit comprises resistors R3 and R7 connected in series, the resistance size of R3 is 2K, the resistance size of R7 is 3K, i.e. a reference point, one end of a resistor R3 is connected with a +2.5V output end of a dual power supply module, one end of the resistor R7 is connected with a-2.5V output end of the dual supply module, therefore, the reference point voltage is 0.5V, the output end of the first comparator U4B is also connected with a pull-up resistor R5, the pull-up resistor R5 is connected with the +2.5V output end of the dual-power module, and the resistance value of the pull-up resistor R5 is 10K;
a data signal pin SI of the digital potentiometer U2 is connected with an output end of a second comparator U4C, a non-inverting input end of the second comparator U4C is connected with a control signal output end of an external control module, the control signal output end outputs an MCU control signal C, two resistors with the size of 5.1K (namely 5.1 kilo-ohm) are further connected in series between the non-inverting input end of the second comparator U4C and the control signal output end of the external control module, an inverting input end of the second comparator U4C is connected with a reference voltage circuit unit, an output end of the second comparator U4C is further connected with a pull-up resistor R9, the pull-up resistor R9 is connected with an output end of +2.5V of a dual-power supply module, and the resistance value of the pull-up resistor R9 is 10K;
enable signal pin of digital potentiometer U2
Connected to the output of a third comparator U4A, a thirdThe in-phase input end of the comparator U4A is connected with the control signal output end of the external control module, the control signal output end outputs an MCU control signal A, two resistors with the resistor size of 5.1K (namely 5.1 kilo-ohm) are further connected in series between the in-phase input end of the third comparator U4A and the control signal output end of the external control module, the reverse phase input end of the third comparator U4A is connected with the reference voltage circuit unit, the output end of the third comparator U4A is also connected with a pull-up resistor R1, the pull-up resistor R1 is connected with the output end of a double power supply +2.5V, and the resistance value of the pull-up resistor R1 is 10K;
a ground pin VSS of the digital potentiometer U2 is connected with a-2.5V voltage output end, the ground pin VSS is grounded through a first capacitor C1, and a capacitor C1 is 104 capacitors; the working voltage pin VDD of the digital potentiometer U2 is connected with the voltage output end of +2.5V, and the working voltage pin VDD is grounded through a 104 capacitor C2; pin PB0 of the digital potentiometer U2 is grounded, pin PW0 of the digital potentiometer U2 is a signal output terminal, and pin PA0 is a signal input terminal.
The MCU control signal generally adopts 3.3V or 5V, the comparator adopts + -2.5V for power supply, and the reference voltage REF adopts the resistance voltage division in FIG. 1: 0.5V. When a signal is input into the comparator, the non-inverting input end (0V) of the comparator is less than the inverting input end (0.5V) of the comparator, and the comparator outputs low level (-2.5V); when a signal is input to 3.3V or 5V, the comparator non-inverting input end (1.75V or 2.5V) is larger than the comparator inverting input end (0.5V), and the comparator outputs high level (2.5V), so that the level conversion of the control signal is realized, the voltage of +/-2.5V is provided for the digital potentiometer, the normal of the control signal is ensured, the signal input can be ensured to adopt alternating current input (-2.5V is smaller than the signal input and is smaller than 2.5V), and the size adjustment of the alternating current signal is realized.
The dual-power module circuit structure of the utility model is shown in fig. 1, and comprises a linear voltage regulation chip U1 and a charge pump chip U3, wherein +5V voltage is output by a linear voltage regulation chip U1 to be +2.5V voltage, and the structure is as follows: the pin GND of the linear voltage stabilization chip U1 is grounded, the pin VIN is connected with an external +5V voltage, the pin VIN is grounded through a capacitor C3, the parameter of the capacitor C3 is 226/10V, the pin OUT outputs a +2.5V voltage, the pin OUT is grounded through a capacitor C4, and the parameter of the capacitor C4 is 226/10V.
The +2.5V voltage is inverted through the charge pump chip U3 to output-2.5V voltage, and the structure is as follows: the pin GND of the charge pump chip U3 is grounded, the pin CFLY + is connected with the pin CFLY-through a capacitor C5, the parameter of the capacitor C5 is 226/10V, the pin IN is connected with a +2.5V voltage output end, the pin IN is grounded through a capacitor C7, the parameter of the capacitor C7 is 106/10V, the pin OUT outputs-2.5V voltage, the pin OUT is grounded through a capacitor C6, and the parameter of the capacitor C6 is 226/10V.
In conclusion, the utility model realizes the capability of inputting and outputting the alternating current signal by the digital potentiometer, and greatly reduces the manufacturing cost.
Claims (9)
1. The digital potentiometer power supply circuit is characterized by comprising a first comparator, a second comparator and a reference voltage circuit unit, wherein the output end of the first comparator is connected with a clock signal pin of a digital potentiometer, and the output end of the second comparator is connected with a data signal pin of the digital potentiometer; the non-inverting input ends of the first comparator and the second comparator are connected with the control signal output end of the external control module, and the inverting input ends of the first comparator and the second comparator are connected with the reference voltage circuit unit.
2. The digital potentiometer power supply circuit according to claim 1, further comprising a third comparator, wherein an output end of the third comparator is connected with an enable signal pin of the digital potentiometer, a non-inverting input end of the third comparator is connected with a control signal output end of the external control module, and an inverting input end of the third comparator is connected with the reference voltage circuit unit.
3. The digital potentiometer power supply circuit according to claim 2, wherein a plurality of resistors are connected in series between the control signal output end and the non-inverting input end of the first comparator, the second comparator or the third comparator.
4. The digital potentiometer power supply circuit according to any of claims 1-3, further comprising a dual power supply module, wherein the dual power supply module is connected to the reference voltage circuit unit.
5. The digital potentiometer power supply circuit according to claim 4, wherein the dual power supply module comprises a linear voltage stabilization chip and a charge pump chip, the linear voltage stabilization chip is used for adjusting an externally input a-volt voltage to a/2-volt voltage output, the charge pump chip is used for performing voltage inversion on the a/2-volt output voltage and then outputting a-a/2-volt voltage, and a > 0.
6. The digital potentiometer power supply circuit according to claim 5, wherein the reference voltage circuit unit comprises a plurality of resistors connected in series, the plurality of resistors connected in series form a series circuit unit, one end of the series circuit unit is connected to the a/2 volt output terminal, and the other end of the series circuit unit is connected to the-a/2 volt output terminal.
7. The digital potentiometer supply circuit according to claim 5, further comprising a pull-up resistor, wherein one end of the pull-up resistor is connected to the output terminal of the first comparator, the second comparator or the third comparator, and the other end of the pull-up resistor is connected to the a/2 volt output terminal.
8. The digital potentiometer power supply circuit according to claim 5, wherein the-a/2 volt voltage output terminal is further connected to a ground pin of the digital potentiometer, and the ground pin of the digital potentiometer is further grounded through the first capacitor.
9. The digital potentiometer power supply circuit according to claim 5, wherein the a/2 volt output terminal is further connected to an operating voltage pin of the digital potentiometer, and the operating voltage pin of the digital potentiometer is further grounded through the second capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122370995.9U CN215642446U (en) | 2021-09-29 | 2021-09-29 | Power supply circuit of digital potentiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122370995.9U CN215642446U (en) | 2021-09-29 | 2021-09-29 | Power supply circuit of digital potentiometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215642446U true CN215642446U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122370995.9U Active CN215642446U (en) | 2021-09-29 | 2021-09-29 | Power supply circuit of digital potentiometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215642446U (en) |
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2021
- 2021-09-29 CN CN202122370995.9U patent/CN215642446U/en active Active
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