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Original question:

BQ76920 OVRD_ALERT bit behavior questions

BQ76920: ALERT pin problem

Sunil Kumar1
Prodigy 10 points
Part Number: BQ76920

status register is giving OVRD_ALERT every time. I have reset the status register but it remains. I have externally pull down the alert pin. If i pull down alert heavenly by 5k register then IC shut down and no I2c reply from the IC. Please suggest appropriate solution.

  • 0
    TI__Guru* 81034 points
    The ALERT pin pull-down should be in the 500k - 1M range. It sounds like you may have noise that is triggering the ALERT pin to observe a false external override. Adding a capacitor (you can use ~470pF which is the value used on the EVM and many of the reference designs) should help to reduce noise. Make sure your pull-down resistor and the noise capacitor are close to the device with short trace length.

    Best regards,
    Matt