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Is external thermistor mandatory for BQ27510

Lijo Thomas
Intellectual 540 points
Other Parts Discussed in Thread: BQ27510

Hi,

We have designed the circuit which has BQ27510 for Li-ion Battery Monitoring.

The problem is if we didn't connect the external thermistor we are not able to read the Battery parameters like state of charge, remaining capacity etc.

The TS input is left open in the circuit

If we didn't connect the external thermistor only the Battery voltage is correctly read by the chip.

In the data sheet it is mentioned that we can use the on chip temperature sensor. 

So i cleared the operation config flash register, Temps bit . This also didn't work around.

Is there any other settings to be done ?

Please guide us.

  • 0
    TI__Intellectual 2340 points

    The gauging algorithm will only function when a battery is detected.

    Make note that the thermistor circuit is also used to detect battery insertion. A battery is seen as inserted when the BI/TOUT pin is pulled low during battery insertion detection. The BI/TOU pin a dual function pin that will force VCC voltage at the moment of temperature measurement to bias the thermistor network and go high impedance to detect logic level to determine battery insertion status. If not using a thermistor then you will need a pull down to make BI/TOUT low when battery inserted. If battery is non-removable then this could be a 10k pull down resistor in place of the thermistor.