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BQ25672: Temperature reading

Amit Kumar

Prodigy 20 points

Part Number: BQ25672

Hi,

I need to read the battery temperature from BQ25672. I think we need to read TS_ADC. Can you tell me the calculation to read temp is degree celsius.

Amit

0 Jeff F 3 months ago

TI__Guru*** 147925 points

Hi Amit,

Please see app note at https://www.ti.com/lit/pdf/slua745

Regards,

Jeff

0 Amit Kumar 3 months ago in reply to Jeff F

Prodigy 20 points

Hi jeff,

Thanks for the document.

What is R0 and T0 in this equation: what is "0" in this? is it 0 deg temp?

Amit

0 Jeff F 3 months ago in reply to Amit Kumar

TI__Guru*** 147925 points

Hi Amit,

No. It is the thermistor's resistant at temperature a fixed temp. Most are at 25C.

Regards,

Jeff

0 Amit Kumar 3 months ago in reply to Jeff F

Prodigy 20 points

Hi jeff,

It means I can take T0=25 and R0= thermistor temp ?? ?

Amit

+1 Jeff F 3 months ago in reply to Amit Kumar

TI__Guru*** 147925 points

Hi Amit,

R0 is the thermistor resistance at T0. If T0=25C, a 103AT NTC has resistance of 10kohm.

Regards,

Jeff