bq24261M

Gary Bell

With the TI Battery Charging IC BQ24261M, the WARM and COOL thresholds are not independently programmable. The COOL and WARM NTC
resistances for a selected resistor divider are calculated, is this true for T HOT?

over 4 years ago

0 Jeff F over 4 years ago

TI__Guru**** 165886 points

Hi Gary,

The external resistor divider is selected to set HOT and COLD thresholds. WARM and COOL are byproducts of the HOT and COLD thresholds.

Regards,

Jeff

0 Gary Bell over 4 years ago in reply to Jeff F

Prodigy 40 points

Thanks for your response.

So if

RHI = 5.63K ohms

RLO = 12.4K ohms

How would you back calculate to find the Temperature (T NCT) for HOT?

Thanks, Gary

0 Gary Bell over 4 years ago in reply to Gary Bell

Prodigy 40 points

Sorry T NTC

0 Jeff F over 4 years ago in reply to Gary Bell

TI__Guru**** 165886 points

Gary,

You would have to solve the datasheet equations for that variable. I don't have a spreadsheet that back calculates NTC value based on resistors but I have a spreadsheet that calculates those resistors from the entered T-HOT resistor value for the NTC. Please see attached. It is assuming a 103AT NTC thermistor.BQ246X_TS_pin_resistor_calc_1V0.xls

Regards,

Jeff

Power management

Power management forum

bq24261M