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IO expanders are powered from VCC_FPGA, which can be shut down #74

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gardners opened this issue Sep 3, 2022 · 1 comment
Open

IO expanders are powered from VCC_FPGA, which can be shut down #74

gardners opened this issue Sep 3, 2022 · 1 comment

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@gardners
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gardners commented Sep 3, 2022

U13 and U14 have power control outputs, and thus these IO expanders should be powered at all times.
However, they are powered from VCC_FPGA. Maybe they should be powered from VBAT instead?
@gardners
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We also need to consider the power source for the U24and U31, as these are all on the I2C bus to the OrangeCrab and Xilinx FPGA. The ADC for battery level is already powered from VBAT, so is not a problem here.

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