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BQ25896: Charging has stopped when temperature is <5C instead of <0C

Part Number: BQ25896

Can you please help us understand why charging is stopped in our design when temperature is <5C instead of <0C.
At 2C and 4C, we are seeing REG 0C showing TS cold fault.  


RT1 = 5.1k 1%

RT2 = 30.1k 1%

 

Here are our register settings:

  0   1    2   3   4   5   6   7    8   9    a   b   c   d   e    f  

7f 10 41 1e 05 01 4b 80 03 44 07 46 00 23 5a 5c

  • Hi,

    Could you please disable 1s continuous ADC conversion (i.e. REG02[6]=0) then redo the measurement without using ADC?

    Thanks,

    Ning.

  • Hi,
    We tried disabling continuous conversion and the result is the same.  Could this be related to the temp thresholds all have a range?

    JEITA THERMISTOR COMPARATOR (BUCK MODE)
    V(T1)
    T1 (0°C) threshold, charge suspended T1 below this
    temperature. As percentage to V(REGN) 72.75% 73.25% 73.75%
    V(T1_HYS)
    Charge back to ICHG/2 (REG04[6:0]) and VREG (REG06[7:2])
    above this temperature. As percentage to V(REGN) 1.4%
    V(T2)
    T2 (10°C) threshold, charge back to ICHG/2 (REG04[6:0]) and
    VREG (REG06[7:2]) below this temperature. As percentage to V(REGN) 67.75% 68.25% 68.75%
    V(T2_HYS)
    Charge back to ICHG (REG04[6:0]) and VREG (REG06[7:2])
    above this temperature. As percentage to V(REGN) 1.4%
    V(T3)
    T3 (45°C) threshold, charge back to ICHG (REG04[6:0]) and
    VREG-200 mV (REG06[7:2]) above this temperature. As percentage to V(REGN) 44.25v 44.75% 45.25%
    V(T3_HYS)
    Charge back to ICHG (REG04[6:0]) and VREG (REG06[7:2])
    below this temperature. As percentage to V(REGN) 1%
    V(T5)
    T5 (60°C) threshold, charge suspended above this
    temperature. As percentage to V(REGN) 33.875% 34.375% 34.875%
    V(T5_HYS)
    Charge back to ICHG (REG04[6:0]) and VREG-200 mV
    (REG06[7:2]) below this temperature. As percentage to V(REGN) 1.25%

  • Hi,

    Yes, it could be related. The temperature thresholds have some variations.

    Thanks,

    Ning.