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BQ25101: Abnormal charge

user5861925
Intellectual 570 points
Part Number: BQ25101

HI:

The product I designed USES TI BQ25101, and the product USES wireless charging. I have the following questions for consultation:

1. When the battery voltage drops to 4.18v, I will disconnect the 5V and re-connect it to the 5V voltage. Will it be recharged?

2. After the battery is fully charged, 5V will be disconnected every 10 minutes and 5V voltage will be supplied again. Now it is found that there will be an occasional phenomenon of no charging after more than ten hours.

BR

Sunny

  • 0
    TI__Guru* 75656 points
    Hi Sunny

    The BQ25101 Recharge detection threshold of about 0.1V below Vo(reg), or 4.1V, see data sheet Recharge or Refresh in specification table. The voltage of 4.18V would be too high to trigger a recharge. Max voltage out of the BQ25101 will be 4.2V

    "I will disconnect the 5V and re-connect it to the 5V voltage" -- Bill J -Can you describe the 5V disconnect and re-connect 5V a little more?
  • 0 in reply to Bill Johns
    Intellectual 570 points
    HI Bill:
    At present, we use the wireless charging scheme to provide 5V voltage to the VIN end of the charger IC.After the first charging, the 5V provided by the wireless charging IC was disconnected. After another 5V voltage was provided every 10 minutes, the charger IC began to charge again. After charging, the charging signal was given and the system disconnected the 5V of the wireless charging IC again.After more than ten hours of measurement, it was found that 5V was provided, but the charger IC was not charging. Please help to check this problem. Is there any direction or method for analysis? thank you.
    BR
    Sunny
  • 0 in reply to user5861925
    TI__Guru* 75656 points
    Hi Sunny

    The system has option for input from Two 5V supplies, one wireless and one other 5V?
    How is the wireless power turning on / off, is this a uC?
    Is the BQ25101 /CHG pin used to as an input to uC and wireless charger?

    Also note that the /CHG pin is used to indicate charge -- the pin behavior is simplified and may not indicate charge as expected. See

    e2e.ti.com/.../753020
  • 0 in reply to Bill Johns
    TI__Guru* 75656 points
    Hi Sunny

    Any update on this problem?
  • 0 in reply to Bill Johns
    Intellectual 570 points
    HI Bill:
    Thank you very much for your support. The problem has been solved. It is a software problem.