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BQ24161EVM-721: BQ24161EVM test issue

Bo Xian Yeh
Intellectual 1415 points
Part Number: BQ24161EVM-721

Hi Team,

Below statement are my customer test issue about BQ24161EVM.

Please help to support if we have any solution.

1:我設充電電流1A,可是串電流表量測只有4XXmA,

2:TS用內部的INT,可以正常工作,可是我ㄧ切到EXT,外面的TS(就是接我們電池的TS PIN),結果在常溫都會錯誤,我量測我們電池的TS PIN阻抗是在10K

3:操作步驟寫JP5 (CD PIN)要先拉HI,再拉LOW,這點是必要的嗎?

datasheet寫要拉low才能正常工作,為何要有先拉hi,再拉low的動作,這點需要確定,這會跟我們後續的軟體設定行為有關?

IC Hardware Chip Disable Input – Drive CD high to place the bq2416xx in high-z mode. Drive

CD low for normal operation. Do not leave CD unconnected.

 

  • 0
    TI__Guru**** 166176 points

    Bo,

    Can you translate to English?

    Thanks,

    Jeff

  • 0 in reply to Jeff F
    TI__Intellectual 1415 points
    Hi Jeff,

    FYI.
    Please let me know if you need any information.

    1: I set up the charge current at 1A, but the system only show around 400mA.

    2 : I used TS internal INT, the function is OK, but when I switch out to external TS, I got the error value, what happen for it? TS pin resistor is 10K.

    3 : User guide mentioned JP5 (CD PIN) need to pull high then pull low, is it necessary?
    datasheet mentioned pull low is OK, but when I studied EVM user guide, why we need to pull high then pull low?
    we need to confirm it.




    Thanks a lot.
  • 0 in reply to Bo Xian Yeh
    TI__Guru**** 166176 points
    Hi Bo,

    Regarding 1, is the voltage at the IC BAT pin close to termination voltage = 4.2V? High resistance connection from BAT pin to battery or battery simulator can cause the IC to enter CV mode earlier than expected.

    Regarding 2, JP1 set to EXT removes the onboard potentiometer = 10kohm from the TS pin. The expectation is that an external 10kohm thermistor or resistor will be attached.

    Regarding 3, CD pin is chip disable. Toggling CD initiates a reset of the state machine. It is recommended to do this after a battery is removed and also after a battery in reattached.