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V2. old version and V3. Upgraded version difference:
*V3 with ESD protection circuit
*V3 supports 5-12V power supply, V2 supports 3-5V power supply
*V3 uses PH2.0 high quality patch port, send matching line, stable and simple.
*V3 pcb size: 3.6* 1.6cm, V2 pcb Dimensions: 2.7 x 1.3CM
More information:
Module overview
>The module requires the user to program the control port to make the digital potentiometer work.
>It can be used to refit automation equipment, audio equipment, household appliances, etc.
>The module on-board voltage stabilizing chip supports wide voltage input of power supply (DC: 5 ~ 12V), and the anti-static protection chip is added at the port to make the module more stable.
Module Parameters
1.Working voltage: V2 supports 3-5V , V3 supports DC5V ~ DC12V
2.Rated power: 1MW
3.Working current:3mA (maximum)
4.Sliding terminal current: 1mA (maximum)
5.waiting current: 500uA (maximum)
Note: x9c103 is a low-power CMOS device. Pay attention to electrostatic damage to the device, especially after replacement, be sure to cool to room temperature before power on.
6.The middle tap of the potentiometer slides between 0-10k (0-100k), with a total of 100 stages (typical impedance of the sliding end of the potentiometer is 40 ?)
7.The VL and VH ports of the digital potentiometer correspond to the low end and high end of the sliding rheostat respectively, and the allowable input voltage range is - 5V to + 5V.
8.The VW port of the digital potentiometer is equivalent to the movable end of the mechanical potentiometer and is controlled by the control port. The typical value of the series resistance at the sliding end is 40 ohms.
Name :VCC/GND
Function: Power input
Parameter: DC3-5V or DC: 5~12V
Describe: On board high-precision linear regulator, supporting DC wide range input
Name : VH/VW/VL
Function: Digital potentiometer (high end / sliding end / low end) interface
Parameter: Input + 5V~-5V range
Describe: Digital potentiometers are different from traditional potentiometers. After the high and low ports are charged, the ammeter measures the sliding terminal voltage. The internal resistance of the resistance gear of ordinary multimeter is too large to directly measure the resistance change.
Name : CS
Function: Power input
Parameter: Programming control
Describe: TTL level
Name : INC
Function: Power input
Parameter: Programming control
Describe: TTL level
Name : U/D
Function: Power input
Parameter: Programming control
Describe: TTL level
When the digital potentiometer is used for the first time to test whether it is good or bad: the resistance value measured by an ordinary multimeter is usually abnormal,this is because of the special internal structure of the digital potentiometer, it is necessary to measure the working state of the potentiometer by voltage division method. Apply DC 5V voltage to VH and VL terminals, measure the voltage of VL port and VW port with the voltage gear of multimeter, change the resistance value after the potentiometer works, and the multimeter will work normally if the measured voltage changes accordingly.
Test part
If you only need to use the test module, you can download the .HEXfile in the test program to the target board without studying the source code
Note:The digital potentiometer module comes with a test program. The program code is C language code, which is written in modules. The code includes: main function, display sub function, key sub function and header file of each module. You can use Keil4 to open the source code and test and learn.
Below is the details of test program
Directly copy the function to the microcontroller engineering, but need to define their own digital potentiometer corresponding IO pins (IO initialization of different microcontroller definition is not the same, control is not the same, need to complete the user change. Digital potentiometer control IO port, all set to push-pull output mode).
If (uart_dat > 0 &&uart_dat < 100)// Use the for loop to adjust the potentiometer resistance (assign the desired value to the uart_dat variable)
{
// Allow control
HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_RESET), // Output low level (digital potentiometer CS port control)
// Set the control direction to increase (set the control direction to decrease, operation port output low level)
HAL_GPIO_WritePin(U_D_GPIO_Port, U_D_Pin, GPIO_PIN_SET), // Output high level (digital potentiometer U_D port control)
// loop adjustment
for(count_res=0, count_res Count_res ++)// Use the for loop to adjust the potentiometer resistance
{
HAL_GPIO_WritePin(INC_GPIO_Port, INC_Pin, GPIO_PIN_RESET), // Output low level (digital potentiometer INC port control)
HAL_GPIO_WritePin(INC_GPIO_Port, INC_Pin, GPIO_PIN_SET), // Output high level (digital potentiometer INC port control)
}
// Reset control
HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_SET), // Output high level (digital potentiometer CS port control)
}
}