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BQ24105: a negative Rt2 value calculated for a different Rth_cold of 10C

Steve Weaver
Prodigy 40 points
Part Number: BQ24105

Hi,

I'm using a 103AT 10K NTC type thermistor and would like to set Rth_cold and Rth_hot to 10 and 45C instead of 0 and 45C as per your example in the datasheet.  I worked through the math for the equations Rt2 and then Rt1 for your values of Rth_cold and Rth_hot correctly but then used my values of Rth_cold and Rth_hot and ended up with a negative value for Rt2 ... any ideas why ?

Thanks.