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On the P2 boards, the operational amplifier gain for current sensing is exactly x100 rather than x101. (non-inverter configuration with R1=1.8kOhm R2=178kOhm) The voltage gain constant had a typo introducing a 10% error. the voltage divider is 10k/100k,so it's x11 gain. ie it should be written (10+100)/10 rather than (10+110). Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chrome-os-partner:28331 TEST=make BOARD=zinger checked manually with a voltmeter and traces. Change-Id: I8097ab50149fee319efc11ebae75802e8a49a7f8 Reviewed-on: https://chromium-review.googlesource.com/204540 Reviewed-by: Alec Berg <alecaberg@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit