BQ25890: temperature value of BQ25890

Jimmy Lai

Expert 6845 points

Part Number: BQ25890

Dear Team,

Our custumer have a case of using BQ25890,

After reading the value of TS (as shown in Figure 1), how do I convert it into a temperature value?

The internal NTC of the battery we use is 10K, B=3435 (Figure 2)

Many Thanks,

Jimmy

over 4 years ago

0 ezhao over 4 years ago

TI__Genius 10240 points

Hi Jimmy,

We are closed on 07/05 in observance of Independence Day and will get back to you when we return to the office by 07/07.

Best regards,

Eric

0 Wyatt Keller over 4 years ago

TI__Guru** 105590 points

Hello Jimmy,

Usually we only recommend one device connect to the thermistor because it can lead to incorrect biasing. If you have an MCU with high input impedance ADC you could sample REGN and TS to estimate the temperature.

I think this link may help you with the thermistor calculations: e2e.ti.com/.../bq25895-rt1-rt2-calculation-question

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ25890: temperature value of BQ25890