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ADT7467
and 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).
THERM Limit Registers
Register 0x6A, Remote 1 THERM limit = 0xA4
(100 ? C default)
Register 0x6B, local THERM limit = 0xA4 (100 ? C default)
Register 0x6C, Remote 2 THERM limit = 0xA4
(100 ? C default)
Hysteresis Registers
Register 0x6D, Remote 1 and Local hysteresis register
T RANGE
100%
0%
<7:4>, Remote 1 temperature hysteresis (4 ? C default)
<3:0>, local temperature hysteresis (4 ? C default)
Register 0x6E, Remote 2 temperature hysteresis register
<7:4>, Remote 2 temperature hysteresis (4 ? C default)
Because each hysteresis setting is four bits, hysteresis
values are programmable from 1 ? C to 15 ? C. It is
recommended that hysteresis values are not programmed to
0 ? C because this disables hysteresis. In effect, this would
cause the fans to cycle between normal speed and 100%
speed, creating unsettling acoustic noise.
T MIN
T THERM
Thermal Calibration
100%
PWM
MIN
PWM
CONFIG
REMOTE 2 =
CPU TEMP
T MIN T RANGE
Thermal Calibration
0%
100%
PWM
MIN
Ramp Control
(Acoustic
Enhancement)
Tachometer 1
Measurement
PWM
Generator
PWM
CONFIG
PWM1
TACH1
CPU FAN SINK
MUX
Ramp Control
(Acoustic
Enhancement)
PWM
Generator
PWM2
T MIN
100%
LOCAL =
VRM TEMP
0%
T RANGE
Thermal Calibration
PWM
MIN
Tachometer 2
Measurement
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
TACH2
FRONT CHASSIS
PWM3
0%
T RANGE
1
23 REMOTE 1 =
AMBIENT TEMP
T MIN
Tachometer 3
and 4
Measurement
Figure 66. How T THERM Relates to Automatic Fan Control
TACH3
REAR CHASSIS
STEP 8: T HYST for Temperature Channels
T HYST is the amount of extra cooling a fan provides after
the temperature measured drops below T MIN before the fan
turns off. The premise for temperature hysteresis (T HYST ) is
that, without it, the fan would merely chatter or cycle on and
off repeatedly whenever the temperature hovered near the
T MIN setting.
The T HYST value determines the amount of time needed
for the system to cool down or heat up as the fan turns on and
off. Values of hysteresis are programmable in the range 1 ? C
to 15 ? C. Larger values of T HYST prevent the fans from
chattering on and off. The T HYST default value is set at 4 ? C.
The T HYST setting not only applies to the temperature
hysteresis for fan on/off, but also is used for the T THERM
hysteresis value, as described in Step 6: T RANGE for
Temperature Channels. Therefore, programming Register
0x6D and Register 0x6E sets the hysteresis for both fan
on/off and the THERM function.
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