Hello,
When I solder a Semitec 103AT-2 (10k ohm) thermistor on my BQ28Z560-R1 based fuel gauge/protection circuit as depicted in the reference design, the IC no longer responds to commands via I2C. This failure occurs when the thermistor is attached before the cell. If the thermistor is attached after the cell, then the system works fine. Disconnecting it restores communication.
VREG reads 2.5V in both cases and I can find no board faults. The FETs appear closed and current flows fine.
I am using the EV2300 and bq Evaluation Software for the Z560 with I2C lines pulled-up to 5V. Chip is identified as version 0.05 by the software.
Has anyone else seen this behavior?
Thanks.
