BQ76952: how to check cells is disconnected with bq76952

jian zhang

Part Number: BQ76952

We use bq76952 manage 16 battery cells , if the cell wire is disconnected with bq76952, how can we read registers of bq76952 to identify the wire is opened.

Thank s

over 1 year ago

0 Luis Torres over 1 year ago

TI__Intellectual 2825 points

Hi Jian,

While there is no Open-Wire Detect fault or bit, you will see the CUV and COV faults become high (CUV for the affected cell and COV for the cell above). From this you can infer an open wire scenario and can read from Settings:Enabled Protections A Register to see the bit status. You can also refer to the TRM Section 5.2.34 Cell Open Wire on how this mechanism works.

I've explained this briefly on this E2E thread: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1202628/bq76942-cell-open-wire-and-current-measurement/4537382#4537382

Hope that helps!

Best,

-Luis T

Power management

Power management forum

BQ76952: how to check cells is disconnected with bq76952