5.3.7 Thermal Monitoring
The TPS659037 device includes several thermal monitoring functions:
- Thermal protection module internal to the TPS659037 device, placed close to the SMPS and LDO modules
- Platform temperature monitoring with an external NTC resistor
- Platform temperature monitoring with an external diode
The TPS659037 device integrates two thermal detection modules to monitor the temperature of the die. These modules are placed on opposite sides of the chip and close to the LDO and SMPS modules. Overtemperature at either module generates a warning to the system; if the temperature continues to rise, the TPS659037 device shuts down before damage to the die can occur.
Thus, two protection levels are available:
- A hot-die (HD) function sends an interrupt to software. Software is expected to close any noncritical running tasks to reduce power.
- A thermal shutdown (TS) function immediately begins the TPS659037 device switch-off.
By default, thermal protection is always enabled except in the BACKUP or OFF state. Disabling thermal protection in SLEEP mode for minimum power consumption is possible.
To use thermal monitoring in the system:
- Set the value for the HD temperature threshold with the OSC_THERM_CTRL.THERM_HD_SEL[1:0] register.
- TS can be disabled in SLEEP mode by setting the THERM_OFF_IN_SLEEP bit to 1 in the
OSC_THERM_CTRL register.
- During operation, if the die temperature increases above HD_THR_SEL, an interrupt (INT1.HOTDIE) is sent to the host processor. Immediate action to reduce the TPS659037 device power dissipation must be taken by shutting down some function.
- If the die temperature of the TPS659037 device rises further (above 148°C) an immediate shutdown occurs. A TS event indication is written to the status register, INT1_STATUS_HOTDIE. The system cannot restart until the temperature falls below HD_THR_SEL.