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BQ25619: The charge current issue

Andy Jin
Intellectual 440 points
Part Number: BQ25619

Tool/software:

Hi expert, 

Something wrong with the bq25619. 

The MCU writes a charge current of 1.18A through I2C, and the battery will be discharged to 3V.

 Problem 1: Shutdown the device, the charging current will be 600mA. And turn on the device with the charger is plugged in. The charging current can reach 1.16A, and then shut down the device again, the charging current will remain at 1.16A. But when the charger is plugged in and out in the shutdown state, the charging current will be 600mA, sometimes it is 320mA.

Problem 2: Plugging in the charger in the power-on state, it cannot enter the 1.16A charging current state. 

Problem 3:Occasionally, it does not enter the charging state when the device is shutdown. And turn on the device first and turned off it, it will be OK. 

Please help confirm what's the matter with BQ25619.

Thanks a lot! 

Andy

  • 0
    TI__Mastermind 40325 points

    Hi Andy,

    I need more of a description of the register writes, hardware actions, oscilloscope captures, etc. that are applied when this is happening. Please share a schematic as well.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Intellectual 440 points

    Hi Mike, 

    The schematic is as below. No more about the register writes, just know set the charge current. I'll add it as I get it. 

  • 0 in reply to Andy Jin
    Prodigy 40 points

    Register setting:

    名称 地址 写入值 说明
    REG01_CHARGER_CONTROL_0 0x01 0x0A 关闭充电
    REG05_CHARGE_CONFIG 0x05 0x8E 关闭看门狗，主机控制模式
    REG00_INPUT_CURRENT_LIMIT 0x00 0x7F 最大输入电流
    REG03_CHARGE_SAFE_LIMIT 0x03 0x12 终止电流
    REG04_CHARGE_VOLTAGE_LIMIT 0x04 0x40 截止电压 4.2V
    REG02_CHARGE_CURRENT_LIMIT 0x02 0x54 主充电电流
  • 0 in reply to Emma
    TI__Mastermind 40325 points

    Hello,

    I need all the register settings when the issue is happening. What is meant by "shutdown the device?" Please provide a clearer description of the actions and the results observed.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Prodigy 40 points

    shutdown the device：Devices equipped with charging chips have been shut down, and the batteries have no power to supply to the connected devices。

    Currently, our investigation shows that when the equipment is powered off for a period of time, the power management chip will reset the default register configuration. In this state, charging (when the device is inactive) cannot be carried out because the microcontroller cannot function properly. The power management chip uses the default configuration (which requires checking the temperature pin) for charging management. Due to the lack of connection of the temperature pin, an alarm is triggered and normal charging cannot be performed. However, when the device is re-powered, the MCU will configure the Charging chip to ignore the TS pin, thereby restoring normal charging.

  • 0 in reply to Emma
    TI__Mastermind 40325 points

    Hello Emma,

    I need specific actions, register writes, applied voltages, enabled loads, measured voltages, oscilloscope captures, and more to help diagnose the problem. Please reference the BQ25619 datasheet and pins to better describe the issue.

    However, unless using TS_IGNORE in REG0x00 bit 6, a proper TS connection is required to enable charge. In the application there needs to be a way to power that MCU (preferably from SYS) in the event that the battery is disconnected. This is the benefit of having an NVDC power path charger.

    Regards,

    Mike Emanuel