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how are TS faults reported on BQ24266?

Jason Work
Genius 10830 points
Other Parts Discussed in Thread: BQ24266

How are TS faults reported on the BQ24266?

On BQ24266 datasheet page 4

TS pin5 description is: “Battery Pack NTC Monitor. Connect TS to the center tap of a resistor divider from DRV to GND. The NTC is connected from TS to GND. The TS function provides 4 thresholds for JEITA compatibility. TS faults are reported by the I2C interface. Pull TS high to VDRV to disable the TS function if unused. See the NTC Monitor section for more details on operation and selecting the resistor values”

 

There is no I2C interface available on the IC

How are the thermal fault reported ?

  • 0
    TI__Guru*** 144000 points

    Without I2C registers and only one /CHG pin, there is no digital reporting of a TS fault.  One method to determine whether TS fault has occurred is to monitor the TS pin voltage.  For example, you could connect the TS pin to an analog to digital input of your processor.  If you don't have access to an AtoD converter, you could use an SVS (comparator + reference) to monitor the TS pin voltage.  Keep in mind that the charger uses the relative TS voltage compared to the DRV voltage.  So, if the input voltage droops below the regulated DRV voltage, the absolute TS voltage trip point changes as well.  For more accurate reporting, I suggest using an AtoD converter to monitor the DRV votlage as well and comparing that voltage to the TS voltage.