SLUSBS8B December 2013 – November 2019 BQ40Z50
PRODUCTION DATA.
The BQ40Z50 device provides support for a safety PTC thermistor. The PTC thermistor is connected between the PTC pin and VSS. It can be placed close to the CHG/DSG FETs to monitor the temperature. The PTC pin outputs a very small current, typical ~370 nA, and the PTC fault will be triggered at ~0.7 V typical. A PTC fault is one of the permanent failure modes. It can only be cleared by a POR.
To disable this feature, connect a 10-kΩ resistor between PTC and VSS.