SLVSB64I November 2011 – March 2018 TPS65217
PRODUCTION DATA.
The TS pin of the TPS65217x device connects to the NTC resistor in the battery pack. During charging, if the NTC resistance indicates that battery operation is less than or greater than the limits of normal operation, charging is suspended and the safety timer value is paused and held at the present value. When the battery pack temperature returns to within the limits of normal operation, charging resumes and the safety time is started again without resetting.
By default, the device supports a 10-kΩ NTC resistor with a B-value of 3480. The NTC resistor is biased through a 7.35-kΩ internal resistor connected to the BYPASS rail (2.25 V) and requires an external 75-kΩ resistor parallel to the NTC resistor to linearize the temperature response curve.
The TPS65217x device supports two different temperature ranges for charging: 0°C to 45°C and 0°C to 60°C. The temperature range is selected through the TRANGE bit in the CHCONFIG3 register.
NOTE
The device can be configured to support a 100-kΩ NTC resistor (with a B-value of 3960) by setting the NTC_TYPE bit to 1b in the CHGCONFIG1 register. However, TI does not recommended this real-time manual configuration. In the SLEEP state, the charger continues charging the battery, but all register values are reset to default values, in which case the charger gets the wrong temperature information. If 100-kΩ NTC resistor support is required, custom programming during production at the TI factory is required.