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Miro Mico · 2017-06-29

Posted on June 29, 2017 at 14:30I try to make some noise using a small 8 OHm @ 1 kHz Buzzer connected to the STM32F446 DAC_OUT1. Seams the PA4 pin got damaged due to high or reverse voltage induced by the buzzer. I used th push/pull GPIO config. Is ...

Miro Mico · 2017-06-29

Posted on June 29, 2017 at 11:58Hi,Im trying to optimize LowPower current consumption of a custom board my hardware guys have made arround a 100pin LQFP STM32F446VET. Currently I fight to find the source of a faulty voltage at GPIO PA4 (Pin 29 with ...

Miro Mico · 2017-06-29

Posted on June 29, 2017 at 16:52But isn't it dangerous to connect such a large coil directly to the processors pin? I suspect the pin could be damaged through induced high or reverse voltage. Am I wrong?

Miro Mico · 2017-06-29

Posted on June 29, 2017 at 13:53Neither works. Even when hold in reset-mode the pin gives out 2.6 volts. Only when PA4 is configured to GPIO output push/pull and set to '0' there is a 0 Volts output.The pin is directly tied to a small mailto:8Ohm@1k...

Miro Mico · 2017-06-29

Posted on June 29, 2017 at 13:34Perhaps you can try to reconfig it asGPIO_MODE_ANALOG and GPIO_NOPULLThats exactly what is done with HAL_GPIO_DeInit() or when I cunfigure the pin to GPIO_Analog using CubeMX. So the voltage essentially stays the same...

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Damaged? 2.5V at PA4 in Reset state (STM32F446VET)

Re: STM32F4: Can DAC_OUT w/o Buffer direct drive a Speaker without getting damaged?

Re: Damaged? 2.5V at PA4 in Reset state (STM32F446VET)

Re: Damaged? 2.5V at PA4 in Reset state (STM32F446VET)