In the BQ77216 device, the TS pin is ratiometrically monitored with an internal pullup resistance R_NTC. Overtemperature is detected by evaluating the TS input voltage to determine the external resistance falls below a protection resistance, R_{OT_EXT}. If the resistance falls below the programmed OT value, a timer circuit is activated. When the timer expires, the COUT and DOUT pins go from inactive to active state. The timer is reset if the resistance rises above the recovery threshold (R_OT + R_{OT_HYS}). Under temperature is detected by evaluating the TS input voltage to determine the external resistance falls below a protection resistance, R_{UT_EXT}. If the resistance rises above the programmed UT value, a timer circuit is activated. When the timer expires, the COUT and DOUT pins go from inactive to active state. The timer is reset if the resistance falls below above the recovery threshold (R_OT – R_{OT_HYS}) If external capacitance is added to the TS pin, it needs to be within the spec limit shown in recommended operating conditions.