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Due to changing a regulations, charging must now have a relay.
The relay is controlled by the charger interface board.
HV Relay Driver
This circuit is copied from the BMS carrier. PB0 is one of the two pins that must be enabled to activate the relay.
Load Switch
datasheet: https://www.infineon.com/dgdl/Infineon-BTS7040-1EPA-DS-v01_00-EN.pdf?fileId=5546d462636cc8fb0163fe8f965308bc