I recently have an issue with ICs that are supposed to be powered off (by p-channel mosfet) still drawing parasitic power. One such instance is an atmega328p that communicates with the main Arduino MEGA2560 via Serial2. When I turn it off, the power rail still has 3.6V. I thought the mosfet was brok…

How do you prevent ICs that are "turned off" from drawing parasitic power?

CrossRoads December 31, 2015, 6:25pm 8

Put a P-channel MOSFET between 5V and I2C pullup resistors. Maybe have it between everything you want to power down even.

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