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BQ25970: BQ25970 Failed to enable charging

liu billy
Intellectual 280 points
Part Number: BQ25970
Other Parts Discussed in Thread: BQSTUDIO, BQ25890, TUSB422, BQ25968

Tool/software:

Dear

   BQ25970 was debug-verified by the BQstudio tool, and it was found that the battery could not be charged after enabling charging. The register was read again, and it was found that the charging enable was disabled again.

Question 1: The BQ25970 fails to charge.

Question 2: The system adopts the combination of BQ2589x and BQ25970 fast charge scheme, how to switch the charging path?

Q3: The BQ25890 and TUSB422 PD control chips used in the system are equivalent to two fast charge protocols QC2.0 and PD. After the QC2.0 and power adapter protocols are used for the first time during the system power-up, do I need to re-plug the charging cable if I want to switch other voltage levels through PD protocol during the charging process? The power adapter uses the BC1.2 protocol to enter the power transmission mode, and should not support the replacement of the fast charge protocol for reconfiguration ?

Q4: The input voltage of the BQ25970 chip is twice the battery voltage, does it mean that VIN>2VO is enough? For example, the battery voltage is 4V, and the input can be 9V or 12V.

Q5: BQ25970 and BQ25968 are PIN-PIN compatible. Are there any other differences? At present, the specification of BQ25970 chip only has a simple system block diagram, without specific pin definition and other items, can you provide a detailed specification?

  • 0
    TI__Intellectual 2530 points

    Hello,

    liu billy said:
    Question 1: The BQ25970 fails to charge.

    There are several faults being reported in the provided register settings, meaning that charge cannot be enabled until these faults are cleared.

    liu billy said:
    Question 2: The system adopts the combination of BQ2589x and BQ25970 fast charge scheme, how to switch the charging path?

    To switch charging from the flash charger to BQ2589x, first disable charging and enable HIZ mode on the flash charger. Then, disable HIZ mode and enable charging on the BQ2589x. To switch back, reverse the process.

    liu billy said:
    Q3: The BQ25890 and TUSB422 PD control chips used in the system are equivalent to two fast charge protocols QC2.0 and PD. After the QC2.0 and power adapter protocols are used for the first time during the system power-up, do I need to re-plug the charging cable if I want to switch other voltage levels through PD protocol during the charging process? The power adapter uses the BC1.2 protocol to enter the power transmission mode, and should not support the replacement of the fast charge protocol for reconfiguration ?

    The battery charger ICs do not handle the charge protocols. I will involve the experts on the controller interface ICs to assist you further.

    liu billy said:
    Q4: The input voltage of the BQ25970 chip is twice the battery voltage, does it mean that VIN>2VO is enough? For example, the battery voltage is 4V, and the input can be 9V or 12V.

    The converter can be started when the input voltage is slightly more than 2x the battery voltage.

    liu billy said:
    Q5: BQ25970 and BQ25968 are PIN-PIN compatible. Are there any other differences? At present, the specification of BQ25970 chip only has a simple system block diagram, without specific pin definition and other items, can you provide a detailed specification?

    You can request the datasheet from the BQ25970 product page: https://www.ti.com/product/BQ25970

    Best regards,

    Alec Lehman

  • 0 in reply to Alec Lehman
    TI__Mastermind 35895 points

    Hi,

    Let me add to this:

    1. TSBUS and TSBAT are at fault, as well as the input is too high to switch. Please fix these before trying to enable the converter.

    3. BQ25890 supports BC1.2 and is compatible with QC2.0 <https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/790857/bq25890-can-maxcharge-be-compatible-with-qc3-0-or-qc2-0>. The BQ25970 does not have D+/D- lines. Please refer to your adapter for how to configure it for the different modes.

    I see this thread was duplicated again. We will answer all of the questions here.

    Regards,

    Mike Emanuel