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ADT7490
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 is hovering at about 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 of 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.
T RANGE
100%
0%
The T HYST setting applies not only to the temperature
hysteresis for fan on/off, but the same setting is used for the
T THERM hysteresis value, described in the Step 7: T THERM
for Temperature Channels section. 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
Enhanced 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 .
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 60. The T HYST Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
THERM Hysteresis
Any hysteresis programmed via Register 0x6D and
Register 0x6E also applies hysteresis on the appropriate
THERM channel.
Enhanced Acoustics Register 1 (Register 0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
Bit 7 (MIN3) = 1, PWM3 runs at PWM3 minimum duty
cycle below T MIN ? T HYST .
Bit 6 (MIN2) = 0, PWM2 is off (0% PWM duty cycle) when
the temperature is below T MIN ? T HYST .
Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty
cycle below T MIN ? T HYST .
temperature is below T MIN ? T HYST .
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