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README: better describe over-voltage protection

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King Kévin 2022-04-08 10:57:55 +02:00
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README.md
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@ -28,7 +28,10 @@ to prevent PD communication, capacitors are placed on the CC lines.
they smooth out the 300 Kbps BMC signal used for PD communication.
it still allows the identification of Rp, Rd, and Ra used for orientation and role detection.
an additional circuit will cut the power when VBUS exceeds 5.5V (on either side of the PD blocker).
additionally there is an over-voltage protection circuit.
VBUS (on either side) is compared to a reference voltage.
when VBUS is below 5.5V, p-channel MOSFETs are switched on, and allow VBUS going from one side to the other.
when VBUS is above 5.5V, the p-channel MOSFETs are switched off, and prevent VBUS interconnection, cutting the power.
warning
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