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BQ25672: NO Charging issue

Allen Lu
Intellectual 2480 points
Part Number: BQ25672

Tool/software:

hi Team, 

 customer feedback they found the one BQ25672 defect was found. The phenomenon is that the motherboard cannot be powered by the charger (there is no charging current when the charger is connected, and the current is less than 2mA, which is equivalent to HI-Z).
Remove the battery pack and connect the external charger at the same time. QON has 3.4V voltage, REGN has no voltage, and Vsys has no voltage.

Connect the battery pack, QON is grounded and activated or connected to the charger to activate, REGN has 5V voltage, and SDRV also starts normally (output voltage = Vpack + 5V)

there are some register analysis show as below,   can you help to check whether it can recover by software?

  • 0
    TI__Guru**** 166506 points

    Hi Allen,

    The register reads above do not make sense to me.  For example, charging voltage limit is 16.7V but input voltage is 5V?  BQ25672 is buck only charger so input voltage must higher than VREG for the converter to switch. FaultStatus1 = 0x55 reports errors for OTG and charge mode at the same time.  Can these be reread, at least REG0x1B through 0x27 and REG0x0F?

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Intellectual 2480 points

    hi Jeff,

     tks for the comment here,  i will reread the below register list as below as you mentioned. but i cannot find the FaultStatus1 = 0x55 on datasheet,  the last one for I2C Registers is 48h.

     

    1Bh REG1B_Charger_Status_0 Charger Status 0 节 8.5.1.23

    1Ch REG1C_Charger_Status_1 Charger Status 1 节 8.5.1.24

    1Dh REG1D_Charger_Status_2 Charger Status 2 节 8.5.1.25

    1Eh REG1E_Charger_Status_3 Charger Status 3 节 8.5.1.26

    1Fh REG1F_Charger_Status_4 Charger Status 4 节 8.5.1.27

    20h REG20_FAULT_Status_0 FAULT Status 0 节 8.5.1.28

    21h REG21_FAULT_Status_1 FAULT Status 1 节 8.5.1.29

    22h REG22_Charger_Flag_0 Charger Flag 0 节 8.5.1.30

    23h REG23_Charger_Flag_1 Charger Flag 1 节 8.5.1.31

    24h REG24_Charger_Flag_2 Charger Flag 2 节 8.5.1.32

    25h REG25_Charger_Flag_3 Charger Flag 3 节 8.5.1.33

    26h REG26_FAULT_Flag_0 FAULT Flag 0 节 8.5.1.34

    27h REG27_FAULT_Flag_1 FAULT Flag 1 节 8.5.1.35

    +

    Fh REG0F_Charger_Control_0 Charger Control 0 节 8.5.1.12