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BQ24161: Battery Fault: What does lead to a battery fault in the Status / Control register?

Michael Daimer
Intellectual 1155 points
Part Number: BQ24161
Other Parts Discussed in Thread: BQ24195L, TPS2121, BQ24133

Hello,

my customer uses the BQ24161 together with a standard Li-Ion cell from Sanyo (https://www.akkuteile.de/lithium-ionen-akkus/18650/sanyo/sanyo-ur18650fm-geschuetzt-li-ion-3-7v-2600mah/a-100687/) in a self developed test setup.

Sometimes during charging a "Battery Fault" in the Status / Control Register occurs. We cannot find anything in the documentation that describes how this fault is triggered? Can you help here  please?

How serious should this fault be treated?

What is your recommended  way of treating this fault? Can you ignore it, in case you reset the device and it won't come back during timeframe x?

Thanks a lot and best regards,

Michael

  • 0
    TI__Guru*** 143880 points
    Michael,

    Battery fault is either Battery OVP or Battery not Present (but only if battery temp fault has not occurred first). Since the default VBATREG=3.6V, if a battery with voltage higher than that is attached before the BATREG register is written to 4.2V, the charger will report Battery OVP. I suspect that is what is happening.

    Regards,
    Jeff
  • 0 in reply to Jeff F
    TI__Intellectual 1155 points

    Hi Jeff,

    thanks for your answer. But unfortunately it seems that this is not causing the issue.

    I was able to get some more information that might help.

    VIN = 15V constant

    VUSB disconnected; battery is always connected. 

    The BQ is used on a module that runs on Linux. After turning on this module, the BQ gets resetted and is then reprogrammed to the follwong values:

    VBATREG = 4.18V

    Charging current 700mA

    Safety Timer 6h

    The failure only occurs sometimes during charging and especially, when the battery voltage is in the range of VBATREG.

    I thought VBATREG is the end-of-charge voltage. Maybe this is incorrect, but if it is not, how can I then differentiate between end-of-charge voltage and and overvoltage, that triggers OVP?

    Thanks and best regards,

    Michael 

  • 0 in reply to Michael Daimer
    TI__Guru*** 143880 points

    Michael,

    Maximum operating input voltage for the BQ2416X family IN input is 10.5V.  After that, the input is considered in OVP and the buck converter shuts down.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Intellectual 1155 points
    Hi Jeff,

    thanks a lot. Seems like this is causing the issue.
    Can you recommend a p2p replacement with higher operating VIN and if not, which charger would you recommend instead that is not p2p.

    Thanks,
    Michael
  • 0 in reply to Michael Daimer
    TI__Guru*** 143880 points
    Michael,

    We do not have another dual input charger. For 15V input, I recommend Bq24133 without regulated minimum SYS and BQ24195L with regulated minimum SYS voltage. If you need dual input, you can add TPS2121 in front.

    Regards,
    Jeff
  • 0 in reply to Jeff F
    TI__Intellectual 1155 points
    Thanks for your recommendation!
    We will try the two parts you suggested. I think dual input is not needed in this case.

    Thanks and best regards,
    Michael