Other Parts Discussed in Thread: BQ40Z50, BQ27541
Dear friends
I need help. I am using bq2012 in my project (6 NIMH cells in serial). The defect rate is up to 5% in mass production. All the defect are related to BQ2012. BQ2012 damaged so easily.
Some symptom :
1) High quiescent current. Normally, the quiescent current is around 0.12mA. but some show 1.6mA.
2) Incorrect initial LCM data. It doesn’t resume to correct initial LCM after reset. Even cut off the power and connect again. No correct initial LCM value appear.
3) BQ2012 have no function. I measured the quiescent lower than normal , it is only 0.018mA ( normally, it 0.12mA).
4) Normally, the charge pin should be low when the battery is not fully charged. But low state never appear even fully discharged.
Schematic for reference. The bq2012 is powered by 3.3V regulator.
Thanks
zeng