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ADT7473
Table 43. T MIN REGISTERS
Register Description Default
0x67 Remote 1 Temperature T MIN 0x9A (90 ? C)
0x68 Local Temperature T MIN 0x9A (90 ? C)
0x69 Remote 2 Temperature T MIN 0x9A (90 ? C)
Enhanced Acoustics Register 1 (0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
100%
0%
T MIN
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
temperature is below T MIN ? T HYST .
Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty
cycle below T MIN ? T HYST .
Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty
cycle below T MIN ? T HYST .
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 52. Understanding the T MIN Parameter
REAR CHASSIS
Step 4: PWM MIN for Each PWM (Fan) Output
PWM MIN is the minimum PWM duty cycle at which each
fan in the system runs. It is also the start speed for each fan
under automatic fan control once the temperature rises
above T MIN (see Figure 53). For maximum system acoustic
benefit, PWM MIN should be set as low as possible.
Depending on the fan used, the PWM MIN setting is usually
in the 20% to 33% duty cycle range. This value can be found
through fan validation.
100%
PWM MIN
0%
T MIN
TEMPERATURE
Figure 53. PWM MIN Determines Minimum
PWM Duty Cycle
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