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STM32F411 Output pin connection while no VCC is applied

Question asked by Nir Alon on Apr 1, 2018
Latest reply on Apr 8, 2018 by Nir Alon

Hello all,

 

In my application, I'm controlling a secondary device using enable pin which has an internal pull-up resistor.

The output pin is set to be "0" or open drain type output, and the STM32F411 VCC1 can be powered down while the secondary device's VCC2 is still active.

 

 

Can I connect the output pin directly to the secondary device enable pin or should I place a Tri-state buffer between them?

 

Thanks!

 

Nir

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