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Pin consumption

Question asked by Andres Cao on Feb 26, 2018
Latest reply on Feb 26, 2018 by waclawek.jan

Hi all,

 

I have a STM32L073 on a custom application. 

 

I'm having some strange behavior with open pins. 

 

Particularly, PH1 and PC3 are floating, nothing is connected to them. When both are set as Digital In the current consumption is as follow:

 

PH1PC3Current
PullupPullup +0.0uA
PullupNo pull +0.0uA
No pullPullup +0.0uA
No pullNo pull +50.0uA

 

From the table, the first three results are reasonable, because even with pullups, the pins are floating so there's no extra consumption. However, it's weird that I get an extra 50uA when both pullups are deactivated.

 

I'm curious to understand what is the relation between the pins, only when both are at no pull I get extra consumption and they're floating. Also, if pins are analog, any combination yields +0.0uA. 

 

I couldn't find proper pin diagrams to see how could this happen. Any input is welcomed.

 

Thanks!

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