Hi all,
I have a question about AFEC pin voltage of SAM V71 Xplained ULTRA board.
I use pin AFE0_AD2 (labeled as CANRX on board) and AFE0_AD5 (labeled as CANTX on board) for my ADC application.
Both pins show voltage at roughly 3.1V in the beginning.
When I enable-AFEC-channel in program (involves register AFEC_CHER), the pin voltage drops to 2.6V and 2.1V accordingly.
The voltages continue to slightly drop to 2.6V and 2.0V when I set-analog-offset (involves register AFEC_COCR) to both AFEC channels.
And when I set bias-current-control and PGA (involves register AFEC_ACR) to the AFEC channels, the pin voltages show 2.5V and 1.6V.
Does anyone know why do the pin voltages change?
I would like to set the pin voltage at 0V so that it could read the correct voltage readings from sensors connected to the AFEC pins.
Thank you.
SAM V71 Xplained ULTRA: AFEC pin voltage
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