BQ25120A: Read thermistor temp measurement over I2C?

Nicholas Carley

Part Number: BQ25120A
Other Parts Discussed in Thread: BQ27220, BQ25155

Can you read the thermistor temp measurement from the BQ25120A over I2C?

The goal here is to tie the thermistor to the BQ25120A, read the value from the BQ25120A to the MCU, then write that to the fuel gauge (BQ27220).

Thanks,
Nick

over 5 years ago

0 Raheem over 5 years ago

TI__Mastermind 21590 points

Hello NIck,

You can read the TS voltage directly on the BQ25120A. The charger will only report what mode the TS temperature is and if there is a TS fault. The BQ25155 has the ability to read the TS voltage through the internal ADC if they need that functionality.

They can also tie the NTC to the gauge and have it send command to the MCU which can change the charger operation based on the TS voltage.

0 Nicholas Carley over 5 years ago in reply to Raheem

TI__Genius 9925 points

Can you have the thermistor tied to the BQ25120A's TS pin and to a MCU's ADC input? Or will those with the ADC interfere with the TS pin operation?

Thanks,
Nick

0 Raheem over 5 years ago in reply to Nicholas Carley

TI__Mastermind 21590 points

Nick,

Yes they can tie the TS pin to the MCU. I'll suggest they use a voltage divider since the TS pin is pulled up to VIN.

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BQ25120A: Read thermistor temp measurement over I2C?