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KV5XP     indirect power supply through a IO-Pin

Question asked by Stephan Schade on Sep 18, 2018
Latest reply on Sep 18, 2018 by John Suchyta


We have a Problem with a KV5XP Controller: 

A USB to UART Bridge is connect at the Controller, the Bridge is supplied over the USB-Power.

The problem occur when the USB is connect and the Power of the controller is down. The TXD of the Bridge give a high level signal (3,3V) to a controller-pin. This voltage level make a indirect power supply on the 3,3V rail of the controller.


How i can solve this problem?