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BQ25619E: TS monitoring when battery is not charged

Dawei Liu
Intellectual 400 points
Part Number: BQ25619E

Hi there,

I understand during battery charging, battery temperature would be monitored through TS pin, and charge current could be derated based on the JEITA profile. However, my questions are:

1) When the battery is not charging, and BAT is connected to SYS through BATFET, does BQ25619E still monitor the TS pin, and alert the host over I2C?

2) When the battery is not charging, and BQ25619E is powered by an external power supply (12V), does BQ25619E still monitor the TS pin, and alert the host over I2C if TS is out of range? Also in the case, what would be voltage output on REGN pin?

Thanks,

Dawei

  • 0
    TI__Mastermind 19080 points

    Hi Dawei,

    1) The TS pin only monitors and reports a battery temperature fault when the charger is in Buck mode. When no adapter is plugged in and BAT input is supplying the SYS pins, TS monitor is inactive. The NTC fault state will not update when the voltage changes on the TS pin in this case. The buck converter is disabled at this time and REGN (the TS comparison source) is at ~0V.

    2) If you have a valid power supply at VBUS and the buck converter is active, the TS pin will be monitored and reported regardless of charging being enabled or disabled. REGN will be pulled up to regulated voltage by internal LDO and the charger will report when the voltage on TS pin is out of range. After testing on a BQ25619E EVM, with 12V at VBUS and 4V on VBAT, REGN = 6.16V.

    Regards,

    James

  • 0 in reply to James Steenbock
    Intellectual 400 points

    Thank you, James, for your response!