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BQ21080: The charging process is disabled

user6544449
Intellectual 795 points
Part Number: BQ21080

Dear teams

The chip SYS output is ok but BAT is disable. 

I supposed the chip charge function was enable defaultly, right?

Do you have some register configuration file or some advice?

Thanks! 

  • 0
    TI__Mastermind 23410 points

    Hi,

    Can you provide a voltage measurement at the TS/MR pin? It'd also be good if you can provide a register dump to help debugging. Thanks!

    Best Regards,

    Anthony Pham

  • 0
    Prodigy 50 points

    Hi Anthony, 

    Sorry for the late reply,these are the register values:

    pmu 0x00 rd 0x81

    pmu 0x01 rd 0x0

    pmu 0x02 rd 0x0

    pmu 0x03 rd 0x46

    pmu 0x04 rd 0x25

    pmu 0x05 rd 0x2c

    pmu 0x06 rd 0x56

    pmu 0x07 rd 0x84

    pmu 0x08 rd 0x4d

    pmu 0x09 rd 0x11

    pmu 0x0a rd 0x40

    pmu 0x0b rd 0x0

    pmu 0x0c rd 0xc0

    And the voltage on TS/MR pin is 2.9V.

  • 0 in reply to Angelo Zhu
    TI__Mastermind 23410 points

    Hi Angelo,

    The voltage on the TS/MR pin is exceeding the TS thresholds and based on the measurement, it looks like the pin is floating. Can you share a schematic?

    Best Regards,

    Anthony Pham

  • 0 in reply to Anthony P Pham
    Prodigy 50 points

    Hi Anthony,

    I cant give all the schematic,but i could give you the part of the bq21080 chip.Wish that is enough for you.

    These are the pictures :

    Best Regards,

    Angelo Zhu

  • 0 in reply to Angelo Zhu
    Prodigy 50 points

    Hi Anthony,

    You can see that I connected the TS/MR pin to a button , but i found that this pin keep giving me a pulse which will make my mcu keep getting the button interrupt,so I removed the R39 resistance in the SOS button picture .

    About this phenomenon ,i have two questions.

    1.Does the TS/MR always give the pulse that i cant control?

    2.Can I use this pin to connect a button for other purposes,and i can also use this button to hardware reset the chip?

    Best Regards,

    Angelo Zhu

  • 0 in reply to Angelo Zhu
    TI__Mastermind 23410 points

    Hi Angelo,

    Angelo Zhu said:
    1.Does the TS/MR always give the pulse that i cant control?

    Yes, the TS/MR will have a DC signal when VIN is present and will pulse when VIN is not present but battery is present. 

    Angelo Zhu said:
    2.Can I use this pin to connect a button for other purposes,and i can also use this button to hardware reset the chip?

    You can use it for three functions that you can find here: 

    If you are looking for a way read the push button with your microcontroller, it's recommend to use a circuit that does not interfere with the behavior of the push button such as the following:

    It's also important to note that if you are not planning on using the TS feature of the TS/MR pin, to disable the TS function or have a 10k resistor from the TS/MR pin to GND. You can disable it by modifying the following bit if you are unable to add a 10k resistor pulldown

    Best Regards,

    Anthony Pham

  • 0 in reply to Anthony P Pham
    Prodigy 50 points

    Hi Anthony,

    Thanks for the reply,I'll try it and let you know.

    Best Regards,

    Anthony Pham

  • 0 in reply to Angelo Zhu
    TI__Mastermind 23410 points

    Hi Angelo,

    No problem! Looking forward to your update!

    Best Regards,

    Anthony Pham