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BQ40Z50: BQ40Z50

Part Number: BQ40Z50

Dear friends

I  use  BQ40Z50 in my  2- serial product.  I  complete the temperature calibration at  25 degree C.  But, BQ40Z50 report -10 degree C at actual  -5 degree C ambient.   I  did calibration again -5 degree C.  But BQ40Z50  report  30 degree C  at  actual 25 degree C  ambient.

I  guess it is related the B-constant  of  temperature sensor.  what is correct  B-constant  for temperature sensor that is used for BQ40Z50  external sensor.

Thanks

zeng