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MW-520 Temperature Control Mechanism
Model 5203/5205 contains a new temperature control mechanism, based on CPU
internal clock throttling. The new mechanism is valid for all operating systems,
and has several advantages:
• The clock-throttling enables reduction of the CPU heat in high temperature
conditions. In most applications, the CPU performance degradation is
negligible.
• The throttling thresholds are software-adjustable.
• At very high temperature conditions, the MW-520 will usually enter Suspend
state, instead of shutting down. This enables the MW-520 to continue receiving
messages even if, for instance, the unit was left working in a parked car on a
very hot day.
Working Unit:
• At 38°C, the CPU frequency will be reduced to 50%.
• At 45°C, the CPU frequency will be reduced to 25% and the red temperature
led will start blinking.
• At 55°C, the MW-520 will enter Suspend State.
• At 65°C, the MW-520 will shut down.
Power ON:
• At up to 55°C, the unit will start up at full speed.
• At up to 60°C, the unit will start up at 50% CPU frequency.
• At up to 65°C, the unit will start up at 25% CPU frequency.
• If powered on at 70°C, the unit will immediately enter Suspend state.
• The unit will not power on at 75°C or above.
.
The temperature thresholds are defined according to the internal
temperature, therefore the ambient temperature tolerance is ± 2C
Note
Decisions regarding the CPU clock states are based on internal temperatures
within the CPU housing, measured by four sensors inside the CPU housing:
• LM75 is a sensor located on the main board. This sensor is responsible for the
Suspend threshold and for the software shut off sequence, and its level can be
adjusted using the relevant software.
• MM1 is a sensor located on the EMC2 module (Pentium module). This sensor
is responsible for the first 50% throttling, and its level can be adjusted using the
relevant software.
Power Management
25
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