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BQ21040對插拔式電池充電有問題

justin chien
Other Parts Discussed in Thread: BQ21040

你好

我的設計說明如下:

OUT端輸出經過比較器,送出high或low至MCU

CHG端(內部為open drain)pull high至MCU

電池為插拔式

IC本身的電源是靠adapter啟動

1、當電池插入後(TS,OUT,GND同時接觸電池),IC開始對電池充電,但是CHG卻輸出high,MCU判斷錯誤

2、當電池插入後再將電源輸入IC,IC開始對電池充電,CHG卻輸出LOW,MCU判斷正確

想請問一下如何解決此問題?謝謝

  • 0
    TI__Guru*** 130456 points
    你看一下您的电池是否达到下面的状态
    The charge terminal has an internal open drain FET which is on (pulls down to VSS) during the first charge only
    (independent of TTDM) and is turned off once the battery reaches voltage regulation and the charge current
    tapers to the termination threshold set by the PRE-TERM resistor. The bq21040 does not terminate charge,
    however, the CHG terminal will turn off once the battery current reaches 10% of the programmed charge current.
    The charge terminal is high impedance in sleep mode and OVP and returns to its previous state once the
    condition is removed.