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BQ76940: Strange frequency noise of bq76940 with bq78350-R1

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Part Number: BQ76940

I have BMS design using bq78350-R1 + bq76940, LFP 15S configuration.

I have observed strange frequency noise from the cell at  top and bottom of each ADC bank of bq76940.

            such as CELL #5, CELL #6, CELL #10, CELL #11 only, 

                       Not on CELL #1 or CELL #15 or others,

Noise level is various some channel is 30~50mV, some channel up to 200mV.

I have attached some graphs,

Can I get any advice about such a problem ?

Thanks

P/S : I have designed similar with EVM design from TI


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