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BQ76PL455A-Q1: Resetting to default configuration when connecting more battery modules

Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ76PL455A

Hello,

I designed a battery module with 14s16p configuration using 18650 cells and using BQ76PL455A. The AFE is configured to 14 cells -> VSENSE15 and VSENSE16 are tied to VSENSE14. I have encountered a problem with AFE resetting to the default 16 cells configuration which cause cell UV error; this only happens when I connect more than 8 battery modules together in series (total battery voltage ~800V). Right now in our system design, we will connect 15 battery modules in series and each battery module has a contactor (mechanical relay). Please see the system block diagram and AFE circuitry below (ESM is the battery module). Thank you!