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BQ25713: can not charge with low power adapter

CHEN YAN
Intellectual 1430 points
Part Number: BQ25713


Hi, expert

My customer found that BQ25713 can not charge with a 5V/600mA adapter, they have set the 0x0a/0x0b  register as following：

uchar Input_Vol_4V6[2] = {0x00,0x12};

SmartBus_Write_UCB0(CHRG_ADDRESS, Input_Vol_Reg, &Input_Vol_4V6[0] ,sizeof(Input_Vol_4V6));

0x0a  is 0x00,    0x0b  is 0x12.

Could you please give some suggestions about how to solve this issue? Thanks.

Best Regards.

Chen

  • 0
    TI__Genius 11385 points

    Hi Chen,

    There could be a lot of different reasons why it can't charge. Here are my recommendations:

    1. Check an EVM out and refers to user's guide:
    https://www.ti.com/store/ti/en/p/product/?p=BQ25713EVM-017 

    2. Compare design schematic with EVM.

    3. Refer to ChargerStatus() (21/20h) register of the IC for potential hints.

    For this specific case, InputVoltage Register is 0x1200 which gives an input voltage limit of 7808 mV. They need to lower it to below 5V for the IC to deliver power from the input. The DC offset is 3.2 V so they need to add 3.2 V to the register setting. Please refer to  InputVoltage register description on page 62 of the datasheet for more info.

    Thanks and I hope this helps,

    Peng

    *Please press "This Resolved My Issue" on the thread if my answer is satisfactory