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BQ25703A: Watchdog timer stopping charging eventhough disabling watchdog timer within 175sec

VENKATAPPA SACHIN
Intellectual 350 points
Part Number: BQ25703A

Hi,

Charger IC disabling charging by setting ChargeCurrent to 0A, even though I am restarting WDT timer within 175sec. Steps I am following:

1) Enable charging

2) Enable WDT timer (175sec).

3) At 170sec, writing REG0x01[6:5] = 00 to disable watchdog timer and continue charging. 

But charging is stopping. Tried even writing to MaxChargeVoltage() at 170sec but same issue observed. registers:

Register  Value
0x0 0x0E
0x1  0xE6
0x2  0x40
0x3  0x1F
0x4  0x60
0x5  0x22
0x30 0x10
0x31 0x0
0x32 0x37
0x33  0x02
0x34  0x0
0x35 0x0
0x36  0x54
0x37 0x4A
0x38 0x20
0x39  0x81
0x3A  0x0
0x3B  0x20
0x20  0x0
0x21  0xA4
0x22 0x0
0x23 0x0
0x24  0x0
0x25  0x3F
0x26  0x0
0x27  0xFF
0x28  0x0
0x29  0x0
0x2A  0x0
0x2B  0x0
0x2C 0x0
0x2D  0x0
0x06  0x0
0x07 0x0
0x08  0x0
0x09  0x0
0x0A  0xC0
0x0B  0x3A
0x0C  0x0
0x0D  0x1C
0x0E  0x0
0x0F  0x3F
0x2E  0x40
0x2F 0x78



  • 0
    TI__Expert 3320 points

    Hi There:
        

         There is part variation for 175s WD timer. Referring to our data sheet, the minimum timer could be 140sec shown below. Please try to disable the WD at 135s the charging should not stop any more.

    Regards

    Shishuo

  • 0 in reply to Shishuo Zhao
    Intellectual 350 points

    Thanks Shishuo it worked.

    Please clarify why I can't use 175sec? please clarify on part variation.

    Part we are using - bq25703A I2C Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

    Thanks.

  • 0 in reply to VENKATAPPA SACHIN
    TI__Expert 3320 points

    Hi There,

        175 second is the typical design value for time out period, but comes to real manufacture, there are silicon process variation and corner cases. We list the tolerance value here for customer's reference. similar to resistor and capacitor tolerance, the value you are targeting at is not necessary the final value you really achieve for each component.

    Regards

    Shishuo