Hello,
For our prototype boards using the bq76920 we would like to add additional protection beyond the RC filter. The operating environment is automotive with a huge variety of EFT/surge voltages and durations and we're considering zener or TVS diodes at the VCx inputs.
The series resistors (100 ohms in our case, for increased cell balancing current) will limit the current through the zener/TVS, which is good. Do you recommend placing the diodes across the inputs, acting to limit voltage differentially, or from each input to ground? We can see advantages and disadvanteges (especially concerning breakdown voltage selections for TVS') for both so we wanted to defer to any practical experience you might have in recommending the best approach for protecting these inputs.
JohnM