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BQ76952: BQ76952 Cell Open Wire issue : COW_CHK

kaho Syu
Prodigy 80 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQSTUDIO,

Hello Sir:

My project "Settings:Cell Open-Wire:Check Time" is set 5 Sec
I am trying the Cell open wire test,
It can be found that COV, CUV, PF, SS, bits is set high

Check Scan in Battery Management Studio, as shown below


1. How can I see COW_CHK change?     , I see this bit is always bit low.

2. Is there any other bit to know about Open-Wire error?    Currently only see COV, CUV, PF, SS

thank you.

  • 0
    TI__Guru* 77343 points

    Hi Kaho,

    The cell open wire check only occurs for 3ms on a cell every 5 seconds (Check Time setting). The device does not detect whether there is an open wire directly, but the check forces current which will slowly drain the capacitor on the open cell which will result in an CUV protection or a COV protection on the cell above. It can also result in other PFs being triggered (in your example it shows a CUDEP PF) if the capacitor continues to drain. The COW_CHK bit only goes high during the short time that the device is forces this current (3ms for each cell every 5 seconds), so it is hard to observe this bit in BQStudio. You would need to read this register at a faster rate with a microcontroller to observe this bit.

    The open wire check is described in more detail in the Cell Open Wire section of the BQ76952 Technical Reference Manual: https://www.ti.com/lit/ug/sluuby2a/sluuby2a.pdf

    Best regards,

    Matt