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ADT7473
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).
Hysteresis Registers
Register 0x6D, Remote 1 Local Temperature Hysteresis
Register
Table 47. THERM REGISTERS
Register Description
0x6A Remote 1 THERM
Temperature Limit
Default
0xA4 (100 ? C)
Bits <7:4> Remote 1 temperature hysteresis (4 ? C default)
Bits <3:0> Local temperature hysteresis (4 ? C default)
Register 0x6E, Remote 2 Temperature Hysteresis Register
Bits <7:4> Remote 2 temperature hysteresis (4 ? C default)
0x6B
0x6C
Local THERM Temperature
Limit
Remote 2 THERM
Temperature Limit
0xA4 (100 ? C)
0xA4 (100 ? 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 be 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 RANGE
100%
0%
T MIN
T THERM
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM1
ENHANCEMENT)
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
RAMP
PWM
CONFIG
TACH1
CPU FAN SINK
MUX
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CHASSIS
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 62. How T THERM Relates to Automatic Fan Control
REAR CHASSIS
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 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 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.
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