Current leak from I2C line

OPEnSLab-OSU / OPEnS-Hypnos

Power Control Board for microcontroller projects, designed at OPEnS Lab OSU.

https://github.com/OPEnSLab-OSU/OPEnS-Lab-Home/wiki/Hypnos

GNU General Public License v3.0

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Current leak from I2C line #4

Closed baonguyen21 closed 4 years ago

baonguyen21 commented 4 years ago

Hypnos V2.zip The current I2C line is pulled up to +3V. Sensors which share the pin will use the power from the I2C line when they are being shut off. For the MMA8451 board, I was getting leakage of 170uA for SCL and 70uA for SDA when the device is off and no communication.

kamocat commented 4 years ago

That's strange. I thought the pull-ups were tied to the switched 3V3 rail.

baonguyen21 commented 4 years ago

not in the current Hypnos V2. We fixed it in Hypnos V2.1.