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KTD-S0008-F
22
Power and Thermal Management
22.1
SpeedStep Technology
®
The Intel
Atom processor offers the Intel
between maximum performance mode and battery optimized mode depending on the needs of the appli-
cation being run. When powered by a battery or running in idle mode the processor drops to lower fre-
quencies conserving battery life while maintaining a high level of performance. The previous frequency is
set back automatically when the operating mode changes.
22.2
C-State Control
®
The Intel
chipset has been implemented the control for dynamically starting and stopping system clocks
and power. The states are passing through C0 (full on) to C4 one after another. The C-state ends when a
break event occurs (e.g. an IRQ or SMI).
22.3
Hyper-Threading Technology
®
Intels
Hyper-Threading technology boosts system performance without higher clock rates or adding more
processors which is also an optimization of the power consumption. Hyper-Threading works by duplicating
instructions streams, called threads. This allows a CPU to pretend to be two logical processors on the
operating system which must support this technology. Individually the logical processors can be halted or
interrupted or can execute a thread independently of the other logical unit.
22.4
Fan Interface
If a fan is added use this interface to connect a fan to cool off the CPU. The connector only supports 5V
fans. A three pin fan includes a pulse output (sense) which allows the control of fan speed.
22.4.1 Connector
The fan interface is available through connector J29.
Header
Note:
To protect the external power lines of peripheral devices make sure that
1)
- the wires have the right diameter to withstand the maximum available current.
- the enclosure of the peripheral device fulfills the fire-protecting conditions of IEC/EN 60950.
Page 39
®
TM
Enhanced SpeedStep
Pin
Signal Name
SENSE
1
1)
2
VCC
GND
3
JRexplus-DC User's Guide
Power and Thermal Management
technology that automatically switches
Function
Speed monitoring
Power +5V
Ground
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