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BQ24620: BQ24620 Without Thermistor

Alex K16
Intellectual 290 points
Part Number: BQ24620

If a thermistor is not connected to the circuit shown on the page 23 of the BQ24620 data sheet or to the BQ24620EVM board, would charging still work or would it be disabled?

Thanks,

Alex

  • 0
    TI__Mastermind 24075 points

    Hi Alex,

     TS is used to sense temperature as a voltage source, after which we can compare this voltage to internal comparators that have references set according to VLTF, VWARM, VCOOL, VHTF which can be referred to in the EC table. If not using the TS pin (i.e you do not need battery pack thermistor to connect to TS) then use a resistor divider from VREF to GND, with the midpoint tied to TS such that it is between 49% and 70% of VREF, and charger will always think TS is in valid range, so charge will not be disabled due to a TS fault.

    If you use default 430k and 9.1k, then you will have voltage that is 98% of VREF, which would make the charger think it is in a COLD Fault as VTS > VLTF and charging would be disabled. If using the EVM board, you can just solder a 10k resistor in parallel with the 430k resistor, and you will have VTS ~ 52% of VREF which is in valid TS range.

  • 0 in reply to Kedar Manishankar
    Intellectual 290 points

    Hi Kedar,

    We can now consider this issue resolved.

    Thanks,

    Alex