Part Number: BQ76930
Hi, in my BMS I use the AFE bq76930, and I read the battery pack current from the AFE registers, for doing both over-current protection when charging the battery, and data-logging.
I'm finding an error of approx 5% in the cc ADC reading (the current's value read is 5% higher than the real value). It looks like an ADC gain error, 5% for all current's values, no offset error.
My collegue has the opinion that, as this is a coulomb counter, with a long integration time band (250ms), it can be expected to read values higher than the real ones. Is that make sense?
I tried only with one IC so far, didn't replace it to compare. Do I have to expect a similar 5% error if I replace the afe IC for a new one?
Should I do a calibration routine at assembly time, with a std load of, for example, 1A, and rom the ADC gain for using it later at runtime?
Thanks very much,
Sebastian