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ADT7476
Step 8 ? T HYST for Temperature Channels
T HYST is the amount of extra cooling a fan provides after
the temperature measured has dropped back 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 regularly, whenever the
temperature hovers around the T MIN setting.
The T HYST value chosen determines the amount of time
needed for the system to cool down or heat up as the fan is
turning 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 applies not only to the temperature
hysteresis for fan on/off, but the same setting is used for the
T RANGE
100%
0%
T THERM hysteresis value, 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.
In some applications, it is required that fans not turn off
below T MIN but remain running at PWM MIN . Bits [7:5] of
Enhance Acoustics Register 1 (0x62) allow the fans to be
turned off or to be kept spinning below T MIN . If the fans are
always on, the T HYST value has no effect on the fan when the
temperature drops below T MIN .
THERM Hysteresis
Any hysteresis programmed via Register 0x6D and
Register 0x6E also applies hysteresis on the appropriate
THERM channel.
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
REAR CHASSIS
Figure 65. The T HYST Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
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