pcb: allow VBUS to drop to 0V during power cycles
When the external USB PD supply power cycles the board, we keep the MCU and LCD powered for a few seconds with charge from the capacitor bank. However, the 2 MOSFETs acting as level shifters for USB PD I2C communication leaks voltage of ~1V to the I2C ports of the USB PD controller, which leaks through to VBUS. Some supplies refuse to complete the power cycle as long as there is any residual voltage on VBUS. Replace the MOSFETs with a PCA9306 I2C level shifter. It allows the USB PD I2C and thus VBUS voltage to drop to ~0V.
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seedhammer
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298
pcb/lib/mainboard.pretty/VSSOP-8_2.3x2mm_P0.5mm.kicad_mod
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298
pcb/lib/mainboard.pretty/VSSOP-8_2.3x2mm_P0.5mm.kicad_mod
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