Kontron AM4220 - Manual (Page 41)

26 AM4220
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4. Thermal Considerations
4.1 Thermal Monitoring
To ensure optimal operation and long-term reliability of the AM4220, all onboard components must remain
within the maximum temperature specifications. The most critical components on the AM4220 are the
processor and the Dual GE Phy. Operating the AM4220 above the maximum operating limits will result in
permanent damage to the board. To ensure functionality at the maximum temperature, the Module
Management Controller supports several temperature monitoring and control features.
The AM4220 includes three temperature sensors that are accessible via the Module Management Controller.
Although temperature sensing information is made available to the MMC, the AM4220 itself does not provide
any active means of temperature regulation.
Figure 4-1:Temperature Sensor Locations (AM4220 Top View, heat sinks not shown)
The Temp CPU and the Temp Dual GE sensors are on-chip sensors which measure the die temperature of the
Octeon Processor and the Dual GE PHY. The Temp Air Out sensor is a separate sensor measuring the
temperature in the slipstream of the processor. This is the spot with the highest outlet air temperature. The
Dual 10 GE Phy does not have a sensor. Simulations show that its temperature remains uncritical under
operating conditions compared to the processor. The separate heat sink on the 10 GE Phy ensures thermal
decoupling from the processor.
The following table shows the temperature thresholds of all three sensors.
Temp Dual GE
Temp CPU
(Octeon Processor)
SFP Cage
AMC Connector
Airflow Direction
Temp Air Out
Dual 10 GE Phy