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ADT7467
? T MIN is below the high temperature limit. T MIN is
never allowed to exceed the high temperature limit. As
a result, the high limit should be chosen carefully
because it deter-mines the high limit of T MIN .
? T MIN is below the operating point temperature. T MIN
should never be allowed to increase above the operating
point temperature, because the fans would not switch
on until the temperature rose above the operating point.
? The temperature is above T MIN . The dynamic T MIN
control is turned off below T MIN .
Figure 73 shows how T MIN increases when the current
temperature is above T MIN but below the low temperature
limit, and how T MIN is below the high temperature limit and
below the operating point. Once the temperature rises above
the low temperature limit, T MIN remains fixed.
THERM
LIMIT
HIGH TEMP
LIMIT
Step 11: Monitoring THERM
Using the operating point limit ensures that the dynamic
T MIN control mode operates in the best possible acoustic
position and that the temperature never exceeds the
maximum operating temperature. Using the operating point
limit allows T MIN to be independent of system-level issues
because of its self-corrective nature. In PC design, the
operating point for the chassis is usually the worst-case
internal chassis temperature.
The optimal operating point for the processor is
determined by monitoring the thermal monitor in the Intel ?
Pentium ? 4 processor. To do this, the PROCHOT output of
the Pentium ? 4 is connected to the THERM input of the
ADT7467.
The operating point for the processor can be determined
by allowing the current temperature to be copied to the
operating point register when the PROCHOT output pulls
the THERM input low on the ADT7467. This reveals the
maximum temperature at which the Pentium ? 4 can run
before clock modulation occurs.
OPERATING
POINT
LOW TEMP
LIMIT
T MIN
HYSTERESIS
ACTUAL
TEMP
Enabling the THERM Trip Point as the Operating Point
Bits <4:2> of the dynamic T MIN control Register 1 (0x36)
enable/disable THERM monitoring to program the
operating point.
Table 40. DYNAMIC T MIN CONTROL REGISTER 1
(REG. 0X36)
HYSTERESIS
LOW TEMP
T MIN
Figure 73. Increasing T MIN for Quiet Operation
Preventing T MIN from Reaching Full Scale
T MIN is dynamically adjusted; therefore, it is undesirable
for T MIN to reach full scale (127 ? C), because the fan would
never switch on. As a result, T MIN is allowed to vary only
within a specified range.
? The lowest possible value for T MIN is –127 ? C (twos
complement mode) or ? 64 ? C (Offset 64 mode).
? T MIN cannot exceed the high temperature limit.
? If the temperature is below T MIN , the fan switches off
or runs at minimum speed and dynamic T MIN control is
disabled.
THERM
LIMIT
OPERATING
POINT
ACTUAL
TEMP
LIMIT
HIGH TEMP
LIMIT
T MIN PREVENTED
FROM INCREASING
Figure 74. T MIN Adjustments Limited by the High
Temperature Limit
Bit
<2>
<3>
<4>
Mnemonic
PHTR1
PHTL
PHTR2
Description
1 copies the Remote 1 current
temperature to the Remote 1 operating
point register if THERM is asserted.
The operating point contains the
temperature at which THERM is
asserted. This allows the system to
run as quietly as possible without
affecting system performance.
0 ignores THERM assertions. The
Remote 1 operating point register
reflects its programmed value.
1 copies the local current temperature
to the local temperature operating
point register if THERM is asserted.
The operating point contains the
temperature at which THERM is
asserted. This allows the system to
run as quietly as possible without
affecting system performance.
0 ignores THERM assertions. The
local temperature operating point
register reflects its programmed value.
1 copies the Remote 2 current
temperature to the Remote 2 operating
point register if THERM is asserted.
The operating point contains the
temperature at which THERM is
asserted. This allows the system to
run as quietly as possible without
affecting system performance.
0 ignores THERM assertions. The
Remote 2 operating point register
reflects its programmed value.
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