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BQ76940: How does BQ76940 detect the charger insertion?

Andrew Su
Intellectual 1625 points
Part Number: BQ76940

how could BQ76940 detect the charger is inserted? or need the external circuit to detect the charger?

could BQ76940 be waked up from IDLE state when the charger inserted?

thanks!

  • 0
    TI__Guru 54715 points

    Hi Andrew,

    The BQ76940 does not have a charger detect feature.  It does have the load detect comparator, but that may not be effective for detecting a charger since it only works when CHG is off and with CHG off CHG will pull down on the PACK- pin and provide a voltage much like a charger would.  If the system normally loads the PACK terminals and the charger overcomes that load causing LOAD_PRESENT to go low it would work as a charger detect, but you will likely need an external circuit.

    The BQ76940 does not have a feature to wake from idle with charger detection.  If the part is in ship mode, see the application note http://www.ti.com/lit/pdf/slua769 .

    Once the BQ76940 is on, it is under the control of the MCU, an external circuit would need to signal the MCU which would control the BQ76940.