SLVSCO4D July 2015 – February 2019 TPS65917-Q1
The HD detector monitors the temperature of the die and provides a warning to the host processor through the interrupt system when the temperature reaches a critical value. The threshold value must be set to less than the thermal shutdown threshold. Hysteresis is added to the HD detection to avoid generating multiple interrupts.
The integrated HD function provides the host PM software with an early warning overtemperature condition. This monitoring system is connected to the interrupt controller (INTC) and can send an interrupt when the temperature is higher than the programmed threshold. The TPS65917-Q1 device allows the programming of four junction-temperature thresholds to increase the flexibility of the system: in nominal conditions, the threshold triggering of the interrupt can be set from 117°C to 130°C. The HD hysteresis is 10°C in typical conditions.
When the power-management software triggers an interrupt, immediate action must be taken to reduce the amount of power drawn from the PMIC device (for example, noncritical applications must be closed).