While charging, the device continuously monitors battery temperature by sensing the voltage at the TS pin. A negative temperature coefficient (NTC) thermistor should be connected between the TS and GND pins (recommend: 103AT-2). If temperature sensing is not required in the application, connect a fixed 10-kΩ resistor from TS to GND to allow normal operation. Battery charging is allowed when the TS pin voltage falls between V_COLD and V_HOT thresholds (typically 0°C – 45°C). The temperature corresponding to these voltage thresholds can be modified by adding resistors in parallel and in series with the thermistor, as shown in Figure 7-6. If the TS pin indicates battery temperature is outside this range, the device stops charging, enters the STANDBY state, and sets the STAT pins to STAT1 = LOW , STAT2 = HIGH to indicate a recoverable fault. Once battery temperature returns to normal conditions, charging resumes automatically.

Figure 7-6 TS Resistor Network For Modified Temperature Charging Window