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ADT7490
The T THERM limit should be considered the maximum
worst-case operating temperature of the system. Because
exceeding any T THERM limit runs all fans at 100%, it has
very negative acoustic effects. Ultimately, this limit should
be set up as a fail-safe, and one should ensure that it is not
exceeded under normal system operating conditions.
Note that T THERM limits are non-maskable and affect the
fan speed no matter how automatic fan control settings are
configured. This allows some flexibility, because a T RANGE
value can be selected based on its slope, while a hard limit
(such as 70 ? C), can be programmed as T MAX (the
temperature at which the fan reaches full speed) by setting
T THERM to that limit (for example, 70 ? C).
Table 43. THERM REGISTERS
THERM Hysteresis
THERM hysteresis on a particular channel is configured
via the hysteresis settings in the following section (0x6D and
0x6E). For example, setting hysteresis on the Remote 1
channel also sets the hysteresis on Remote 1 THERM.
Hysteresis Registers
Register 0x6D, Remote 1, Local Hysteresis Register
Bits [7:4], Remote 1 Temperature Hysteresis (4 ? C default)
Bits [3:0], Local Temperature Hysteresis (4 ? C default)
Register 0x6E, Remote 2, PECI Temperature Hysteresis
Register
Bits [7:4], Remote 2 Temperature Hysteresis (4 ? C default)
Bits [3:0], PECI Temperature Hysteresis (4 ? C default)
Register
0x6A
0x6B
0x6C
0x3D
Description
Remote 1 THERM Limit
Local THERM Limit
Remote 2 THERM Limit
PECI T CONTROL Limit
Default
0x64 (100 ? C)
0x64 (100 ? C)
0x64 (100 ? C)
0x00 (0 ? C)
Because each hysteresis setting is four bits, hysteresis
values are programmable from 1 ? C to 15 ? C. It is not
recommended that hysteresis values ever be programmed to
0 ? C, because this disables hysteresis. In effect, this causes
the fans to cycle (during a THERM event ) between normal
speed and 100% speed, or, while operating close to T MIN ,
between normal speed and off, creating unsettling acoustic
noise.
T RANGE
100%
0%
T MIN
T THERM
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1
CPU FAN SINK
MUX
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 59. How T THERM Relates to Automatic Fan Control
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REAR CHASSIS
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