BQ25970: TS ADC range in percentage meaning?

tomas manno

Prodigy 70 points

Part Number: BQ25970

BQ25970 manual states

TS ADC reading
Type : R
POR: 0% (0h)
Range : 0%-99.9023%
Fixed Offset : 0%
Bit Step Size : 0.0976563%

What does the percentage mean? What is 0% and what is 100% in Celsius?

over 2 years ago

0 Angelo Zhang87 over 2 years ago

TI__Genius 11850 points

Hi Tuomas,

The percentages refer to VTS/VOUT, where VTS is the voltage at the TSBUS or TSBAT pin, and VOUT is the pull-up rail voltage for the TS resistor divider network. Please refer to Section 8.3.8 in the datasheet ("Device Internal Thermal Shutdown, TSBUS, and TSBAT Temperature Monitoring"). The physical meaning of this percentage in terms of °C depends on your NTC thermistor's resistance across temperature.

Best regards,

Angelo

0 tomas manno over 2 years ago in reply to Angelo Zhang87

Prodigy 70 points

Which datasheet are you referring? BQ25970 SLUSD72B does not seem to have such data.

0 Angelo Zhang87 over 2 years ago in reply to tomas manno

TI__Genius 11850 points

Hi Tuomas,

Have you requested the full datasheet from https://www.ti.com/product/BQ25970?

Best regards,

Angelo

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BQ25970: TS ADC range in percentage meaning?