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BQ25898D: about Charge Safety Timer Expiration

user777540
Expert 1020 points
Part Number: BQ25898D

hello,

I have two questions for you.

1.After Charge Safety Timer Expiration, do I have to read the register twice as shown below to make it a "No safety timer fault" in order to recharge?

To read the current fault status, the host has to read REG0C two times consecutively.

The 1st read reports the pre-existing fault register status and the 2nd read reports the current fault register status.

2.Can it be recharged even if the default mode is set to Charge Safety Timer Expiration?

best regards

  • 0
    TI__Guru 57831 points

    Hi,

    1. Referring to the d/s, REG0C is a fault register. It keeps all the fault information from last read until the host issues a new read. For example, if Charge Safety Timer Expiration fault occurs but recovers later, the fault register REG0C reports the fault when it is read the first time, but returns to normal when it is read the second time. REG0C only reports fault condition and it can't clear fault condition if it exists.

    To reset the safety timer, toggle REG07[3] to disable safety timer and enable again.

    2. A new charge cycle starts when the following conditions are valid:

    • Converter starts

    • Battery charging is enabled by setting CHG_CONFIG bit, /CE pin is low and ICHG register is not 0 mA

    • No thermistor fault on TS pin

    • No safety timer fault

    • BATFET is not forced to turn off (BATFET_DIS bit = 0)

    If safety timer expires in default mode without host, toggle /CE pin should initiate a new charging cycle.

    Thanks,

    Ning.