The CPU diode temperature can be used to prevent damage to the board by shutting the board down if this sensor exceeds predetermined limits.
Adjusting the Environmental Monitoring Warning, Critical, and Shutdown Parameter Settings on the Board
The Netra CP2500 uses the environmental monitoring detection system to monitor the temperature of the board. The environmental monitoring system will display messages if the board temperature exceeds the warning and critical settings. Because the
The Netra CP2500 determines the board temperature by retrieving temperature data from sensors located on the board. A board sensor reads the temperature of the immediate area around the sensor. Although the software might appear to report the temperature of a specific hardware component, the software is actually reporting the temperature of the area near the sensor. For example, the CPU diode sensor reads the temperature at the location of the sensor and not on the actual CPU heat sink. The board’s OpenBoot PROM collects the temperature readings from each board sensor at regular intervals. You can display these temperature readings using the
The temperature read by the CPU sensor will trigger OpenBoot PROM warning and critical messages. When the CPU sensor reads a temperature greater than the warning parameter setting, the OpenBoot PROM will display a warning message. When the sensor reads a temperature greater than the shutdown setting, the SMC will shut down the board.
Many factors affect the temperature readings of the sensors, including the airflow through the system, the ambient temperature of the room, and the system configuration. These factors might contribute to the sensors reporting different temperature readings than expected.
The Netra CP2500 board CPU sensor default temperature threshold values are 110˚C for the high warning temperature, 118˚C for the high shutdown temperature, and 123˚C for the high
