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BQ25883: how to know if the battery is connected

Robin Liu
Intellectual 1940 points
Part Number: BQ25883

hi team,

My customer use the BQ25883 in their project. 

and they have a question, if the BQ25883 has the ability to detech if the battery is correctly connected with the charger? if BQ25883 does, how to read this?

or if not, if there is a method to accomplish the function requirement? Thanks!

Regards,

Robin Liu 

  • 0
    TI__Genius 10240 points

    Hi Robin,

    BQ25883 does not have the battery connection detection function. One workaround solution could be using the ADC. The basic idea is to check the battery voltage by charging and discharging the battery pin. The battery voltage should be stable if the battery is connected. The battery voltage will fluctuate if the battery is not connected. One implementation I can think of is below and needs fine tune for the customer case.

    Step 1, The charger enables charging and disables the termination. After 1 second, read the battery voltage, if the battery voltage is not the setting regulated voltage, then battery is connected.

    Step 2, If the battery is the setting regulated voltage. Disable charging and set REG02[6]= 1 to discharge the battery. After 1 second, read the battery voltage, if the reading is more than certain threshold, say 100mV,  lower than the setting battery. Then the battery is not connected. If the battery voltage reading is tens of millivolts close to the regulated voltage, the  the battery is connected and close to be fully charged.    

  • 0 in reply to ezhao
    TI__Intellectual 1940 points

    hi Eric,

    Thanks for the timely response.

    customer didn't feedback to me by now. 

    Once they ask further more. I'll come back for more help. Thank you.

    Regards,

    Robin Liu