Analog Devices ADT7473 Manual page 44

ADT7473
100%
0%
REMOTE 2 =
CPU TEMP
LOCAL =
VRM TEMP
REMOTE 1 =
AMBIENT TEMP
Enhance Acoustics Register 1 (Reg. 0x62)
Bit 7 (MIN3) = 0 , PWM3 is off (0% PWM duty cycle) when
temperature is below T − T
MIN
Bit 7 (MIN3) = 1, PWM3 runs at PWM3 minimum duty cycle
below T − T .
MIN HYST
Bit 6 (MIN2) = 0, PWM2 is off (0% PWM duty cycle) when
temperature is below T − T
MIN
T
RANGE
T T
MIN THERM
THERMAL CALIBRATION
100%
0%
T T
MIN RANGE
THERMAL CALIBRATION
100%
0%
T T
MIN RANGE
THERMAL CALIBRATION
100%
0%
T T
MIN RANGE
Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
Figure 60. The T
HYST
.
HYST
.
HYST
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
PWM
MIN
RAMP
CONTROL
MUX
(ACOUSTIC
ENHANCEMENT)
TACHOMETER 2
MEASUREMENT
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
TACHOMETER 3
AND 4
MEASUREMENT
Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty cycle
below T
MIN
Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when
temperature is below T
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty cycle
below T
MIN
Rev. 0 | Page 44 of 76
PWM
CONFIG
PWM
PWM1
GENERATOR
TACH1
PWM
CONFIG
PWM
PWM2
GENERATOR
TACH2
PWM
CONFIG
PWM
PWM3
GENERATOR
TACH3
− T .
HYST
− T .
MIN HYST
− T .
HYST
CPU FAN SINK
FRONT CHASSIS
REAR CHASSIS