Datasheet

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Local-High-Temp-Limit
LocalTemperature
Local-Low-Temp-Limit
Remote-High-Temp-Limit
RemoteTemperature
Remote-Low-Temp-Limit
Local-Critical-Temp
LocalTemperature
Remote-Critical-Temp
RemoteTemperature
ActiveControlTemperature
PSV-Temp
L-THERMLimit
LocalTemperature
R-THERMLimit
RemoteTemperature
LTOIE
RTOIE
PSVIE
THERM-FAN-EN
THERMOVIE
THERM-FAN-EN
THERMOVIE
LTOInterrupt
PinLow
SMBALERT
RTOInterrupt
PinLow
SMBALERT
OVR PinLow
SMBALERT PinLow
OVR PinLow
SMBALERT PinLow
PSVInterrupt
PinLow
SMBALERT
Assert PinLowTHERM
ForceFantoFullSpeed
LocalThermInterrupt
PinLow
SMBALERT
Assert PinLowTHERM
ForceFantoFullSpeed
RemoteThermInterrupt
PinLowSMBALERT
LTH
LTL
LTO
RTH
RTL
RTO
LTCBitinStatusRegister2
RTCBitinStatusRegister2
LPSVBitinStatusRegister2
R-THERMBitinStatusRegister1
L-THERMBitinStatusRegister2
AMC6821
SBAS386C – MAY 2006 – REVISED JULY 2007
4. THERM Limit: This limit is an additional fail-safe threshold. When the local or remote temperature is equal to
or above this limit, the corresponding L-THERM or R-THERM bit is set ('1'), and the THERM pin is asserted
low, which can be used to throttle the CPU clock. Furthermore, the THERM interrupt is generated on the
SMBALERT pin if enabled (THERMOVIE = 1). Reading Status Register 1 clears the R-THERM and
L-THERM bits. Once cleared, these bits are not reasserted until the temperature falls 5 ° C below the THERM
limit, even if the THERM condition persists. If the THERM-FAN-EN bit of Configuration Register 3 is set ('1'),
L-THERM = 1 or R-THERM = 1 forces the fan to run at full speed. When THERM-FAN-EN = 0, the status of
the L-THERM and R-THERM bits do not affect the fan speed directly. Note that the THERM limit can be
lower or higher than other temperature limits. For example, if the THERM limit is lower than the PSV
temperature limit, then the CPU clock can be throttled while the cooling fan is off.
Figure 14. Temperature Out-of-Range Detection
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