How to customize the output voltage of stm32

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How to customize the output voltage of stm32 [Copy link]

 

To customize the output voltage on an STM32 microcontroller, you can use the analog output function of the microcontroller. Typically, an STM32 microcontroller has some analog output channels that can be configured to generate a specified voltage. The following is a common method:

1. Using DAC module

Many STM32 microcontrollers are equipped with a Digital-to-Analog Converter (DAC) module that can be used to generate an adjustable analog output voltage. Following are the basic steps to use the DAC module:

a. Initialize the DAC module

First, you need to configure the DAC module in the initialization code. This usually includes setting the DAC output channel, reference voltage source, etc.

b. Write output value

In your program, you can use the DAC output register to write the desired output value to the DAC module. This value is usually a number that represents the desired voltage value within the DAC output range.

c. Control output voltage

The DAC module will generate a voltage output based on the value written to the DAC output register. You can update this value periodically as needed to change the output voltage.

d. Connect to external circuit

Connect the output of the DAC module to an external circuit, such as an op amp, to obtain the desired output voltage.

2. Use PWM output

In addition to the DAC module, you can also use PWM to output analog voltage. This requires a low-pass filter to convert the PWM signal into an analog voltage.

a. Initialize PWM module

Configure the STM32 PWM module and select the appropriate output channel and frequency.

b. Generate PWM signal

According to the required output voltage, a corresponding PWM signal is generated. The output voltage can be adjusted by changing the PWM duty cycle.

c. Connect to filter

Connect the PWM output to a low-pass filter, such as an RC filter. The filter will smooth the PWM signal and produce a stable analog voltage.

Whether you choose to use DAC or PWM, you need to ensure that the output voltage range and accuracy meet your needs. In addition, pay attention to the connection of external circuits and the design of filters to ensure a stable output voltage. In practical applications, it is recommended to refer to the reference manual and related application notes of the STM32 microcontroller for more detailed configuration and usage information.