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Original question:

BQ24600: High working temperature

BQ24600: BQ24600

Tan11
Prodigy 40 points
Part Number: BQ24600

Hi everyone!
I am working with BQ24600 and read datasheet (7.3.14 Temperature Qualification - page 14) and i don't know how to define RTHcold and RTHhot from t_cold and t_cut_off.
Please help me!
Thank a lot

Nguyen Dinh Tan

  • 0
    TI__Mastermind 24075 points

    Hi Tan,

       Tcold and Thot is defined as the temperature thresholds you want the cutoffs to be. Once this is defined (picked by the user), these temperatures correspond to different resistance values on the thermistor (assume 103AT NTC thermistor), and these resistances are RTHcold and RTHhot (you will find these in the thermistor datasheet). From that you have all the values necessary to calculate what RT1 and RT2 you need in your system. You can use the BQ24600 user guide as a reference. (shows EVM schematic).

  • 0 in reply to Kedar Manishankar
    Prodigy 40 points

    Thank for your reply.
    But i want to change temperature of charge circuit to 0~50°C instead of recommend on datasheet (0~45°C). What should i choose RT1 and RT2 value?
    Thank you!

  • 0 in reply to Tan11
    TI__Mastermind 24075 points

    Hi Tan,

       Since you have picked your thot and tcold, now you can find what RThot and RTcold from the thermistor datasheet you are going to use, and then plug into the equation, and find the RT1 and RT2 values.