STM32G491CEU6 PWM output has a very fast rise time (~2ns) and 400mV Overshoot when not loaded. How come there is so much overshoot? Is this harmful for the pin?

[BGheb.1]

I'm using PB14, TIM15_CH1 for my PWM signal. Since it's TT_a I/O structure 3.6V tolerant.

[Tesla DeLorean]

Perhaps you could ease back on the slew-rate setting? Perhaps from one of the 120-180 MHz ones to the 1-5 MHz, or something remotely appropriate..

 GPIO_InitStruct.Speed    = GPIO_SPEED_HIGH; // << THIS TO SPEED_LOW RATHER THAN SPEED_EXCESSIVELY_HIGH

[BGheb.1]

Thank you Tesla, I'll go ahead and try adjusting the slew rate and see if it helps with my issue.

[TDK]

It could also be due to a poorly calibrated scope probe.

I doubt the chip can harm itself by generating a PWM with no/minimal attached circuitry.

[BGheb.1]

But if find it really odd since I am also generating PWM from another pin and it has a slower rise time (~6ns) and little to no overshoot. I'm using the same code on both pins and probing with the same scope and same setup.

[Uwe Bonnes]

The overshoot is mostly from the connected device or from your probe connection. Try to reduce the GPIO speed...

[S.Ma]

Don t worry about this as there is no specific warning on the spec. RF modules, wifi or else do have a strong antenna output pin and in this case the spec does warn you that if the antenna is missing when transmitting, it is destructive to the pin.