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What is the behavior of the IO when the device is unpowered?

Question asked by Lee Honaker on Dec 16, 2015
Latest reply on Jan 7, 2016 by Lee Honaker

I have a board with an MK60FX512VLQ15 on it with IO connected as control inputs to an LTM4609 DC/DC Regulator. When the uC is not powered, the IO appear to be logic '0' to the regulator. Unfortunately this regulator supplies power to the uC and the active low state is preventing it from turning on.

 

Does anyone know if the IO of an unpowered device are supposed to behave this way?

 

Thanks,

Lee

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