Using STM32WB55 Based on 32 KHz LSE how can we generate 40 KHz signal.

Dear all,

How can we generate a 40 KHz signal based on LSE (32KHz crystal)?

If I Feed the HSE 32MHz / 32 to run the either LPTIMER's would it be still in low power?

Thanks,

mmsya.

This topic has been closed for replies.

Best answer by Foued_KH

Hello @Community member ,

Enable the LSE crystal as the clock source for the RTC (Real-Time Clock) peripheral.
Enable the LPTIM peripheral and configure it to run in PWM mode.
Set the LPTIM's prescaler and ARR (Auto Reload Register) values to generate a 40 kHz PWM signal.
Configure the LPTIM's compare register to generate the desired duty cycle for the PWM signal.
Enable the PWM output on the LPTIM's corresponding GPIO pin

Foued

Foued_KHBest answer

ST Employee

Hello @Community member ,

Enable the LSE crystal as the clock source for the RTC (Real-Time Clock) peripheral.
Enable the LPTIM peripheral and configure it to run in PWM mode.
Set the LPTIM's prescaler and ARR (Auto Reload Register) values to generate a 40 kHz PWM signal.
Configure the LPTIM's compare register to generate the desired duty cycle for the PWM signal.
Enable the PWM output on the LPTIM's corresponding GPIO pin

Foued

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