I am implementing a Smart Battery Charger reading data from the SMBus in order to charge a bq20Z90/bq29330-equipped battery. In order to test the performance of the charger, I am using a production battery PCBA with a power supply and balancing resistors to provide a simulated battery for the charger. My problem is that one of the parameters the charger reads from the battery is Relative State of Charge (RSOC). I cannot write to the SMBus from the tester firmware in order to get the battery simulator to communicate an appropriate RSOC (or Remaining Capacity) to the charger under test. Does anybody have any suggestions on how I can get the charger to read the "correct" RSOC corresponding to the supplied test voltages?
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