AC80566UC005DE S LB2C Intel, AC80566UC005DE S LB2C Datasheet - Page 70

• Manufacturer Part Number: AC80566UC005DE S LB2C
• Description: MPU, ATOM PROCESSOR, Z510, U-FCBGA
• Manufacturer: Intel
• Series: ATOM - Z5xxr

Specifications of AC80566UC005DE S LB2C

• Core Size: 32bit
• Program Memory Size: 512KB
• Cpu Speed: 400MHz
• Digital Ic Case Style: FCBGA
• No. Of Pins: 441
• Supply Voltage Range: 0.75V To 1.1V
• Operating Temperature Range: 0°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.1.2
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Intel® Thermal Monitor
The Intel Thermal Monitor helps control the processor temperature by activating the
TCC (Thermal Control Circuit) when the processor silicon reaches its maximum
operating temperature. The temperature at which the Intel Thermal Monitor activates
the TCC is not user configurable. Bus traffic is snooped in the normal manner and
interrupt requests are latched (and serviced during the time that the clocks are on)
while the TCC is active.
With a properly designed and characterized thermal solution, it is anticipated that the
TCC would only be activated for very short periods of time when running the most
power intensive applications. The processor performance impact due to these brief
periods of TCC activation is expected to be minor and hence not detectable. An under-
designed thermal solution that is not able to prevent excessive activation of the TCC in
the anticipated ambient environment may cause a noticeable performance loss and
may affect the long-term reliability of the processor. In addition, a thermal solution
that is significantly under designed may not be capable of cooling the processor even
when the TCC is active continuously.
The Intel Thermal Monitor controls the processor temperature by modulating (starting
and stopping) the processor core clocks or by initiating an Enhanced Intel SpeedStep
Technology transition when the processor silicon reaches its maximum operating
temperature. The Intel Thermal Monitor uses two modes to activate the TCC:
automatic mode and on-demand mode. If both modes are activated, automatic mode
takes precedence.
There are two automatic modes called Intel Thermal Monitor 1 (TM1) and Intel
Thermal Monitor 2 (TM2). These modes are selected by writing values to the MSRs of
the processor. After automatic mode is enabled, the TCC will activate only when the
internal die temperature reaches the maximum allowed value for operation.
The Intel Thermal Monitor automatic mode must be enabled through BIOS for the
processor to be operating within specifications. Intel recommends TM1 and TM2 be
enabled on the processor.
When TM1 is enabled and a high temperature situation exists, the clocks will be
modulated by alternately turning the clocks off and on at a 50% duty cycle. Cycle
times are processor speed dependent and will decrease linearly as processor core
frequencies increase. Once the temperature has returned to a non-critical level,
modulation ceases and TCC goes inactive. A small amount of hysteresis has been
included to prevent rapid active/inactive transitions of the TCC when the processor
temperature is near the trip point. The duty cycle is factory configured and cannot be
modified. Also, automatic mode does not require any additional hardware, software
drivers, or interrupt handling routines. Processor performance will be decreased by the
same amount as the duty cycle when the TCC is active.
When TM2 is enabled and a high temperature situation exists, the processor will
perform an Enhanced Intel SpeedStep Technology transition to the LFM. When the
processor temperature drops below the critical level, the processor will make an
Enhanced Intel SpeedStep Technology transition to the last requested operating point.
The Intel Thermal Monitor automatic mode must be enabled through BIOS for
the processor to be operating within specifications. Intel recommends TM1
and TM2 be enabled on the processors.
TM1 and TM2 can co-exist within the processor. If both TM1 and TM2 bits are enabled
in the auto-throttle MSR, TM2 will take precedence over TM1. However, if Force TM1
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