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BQ78350: Fauel Gauge SMBus checksum

Part Number: BQ78350
Other Parts Discussed in Thread: BQ34Z100

Dear,

Actually , we are troubleshooting an old design which using BQ78350/BQ769640 fuel gauge! and, we checked out the datasheets, but still we need your advice, and help:

 - Which SBS Command  (BQ78350) to enable PEC? Otherwise the SmBus Command   value to enable Packet Error Checking?
 - How to know in advance the PEC Byte value: The host PC(Master) compute the PEC value; thereby it knows this value, but something is not clear for the fuel gauge side(Slave), where the expected PEC  Value is unknown!
 - Which Fuel gauge (14 serial cells), could you advice for our on the way design?

Best Regards,