ZHCSI59I July 2009 – May 2018 TPS65070 , TPS65072 , TPS65073 , TPS650731 , TPS650732
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
The battery charger integrated in TPS6507x has an over temperature protection for the Li-ion cell. The temperature is sensed with a NTC located at the battery. Comparators in TPS6507x suspend charge at a temperature below 0°C and above 45°C. The charger supports two different resistor values for the NTC. The default is internally programmed to 10 kΩ. It is possible to change to a 100-kΩ NTC with the I2C interface.
RESISTANCE AT 25°C | CURVE / B VALUE | RT2 NEEDED FOR LINEARIZATION | MANUFACTURER |
---|---|---|---|
10 kΩ | Curve 2 / B=3477 | 75 kΩ | Several |
100 kΩ | Curve 1 / B=3964 | 370 kΩ | Several |
For best performance, the NTC needs to be linearized by connecting a resistor (RT2) in parallel to the NTC as shown in Figure 47. The resistor value of RT2 needed for linearization can be found in Table 15.
If the battery charger needs to be operated without a NTC connected, for example, for test purposes, a resistor of 10 kΩ or 100 kΩ needs to be connected from TS to GND, depending for which NTC TPS6507x is configured to in register CHCONFIG1.