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Original question:

BQ76952: bq76952-PTO

BQ76952: Alert pin function problem.

jmyang
Expert 1186 points
Part Number: BQ76952

Hello, Ti experts，

    How can the voltage of alert pin be restored, or what method can be used to clear the alarm status(), except for reset.

    As shown in the figure below,

    At the beginning, the alert pin outputs a high level of 1.78v. When I reduce the cell voltage to 2.4V, CUV occurs and alert pin outputs low level 0V. The SSA of alarm status() is red.

    Then I adjusted the cell voltage to 3.0V, and the CUV recovered, but the alert pin still output low level 0V, instead of the 1.78v I expected.

     Is this normal?

     I want the alert pin return to high level after CUV recovery. What should I do?

  • 0
    TI__Guru* 81034 points

    Hi,

    The bits in the AlarmStatus (0x62) register are latched and the ALERT pin will stay asserted until these bits are cleared. You can clear the corresponding bit by writing a '1' to that bit in the AlarmStatus register.

    Best regards,

    Matt