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ADT7467
Hysteresis Registers
Register 0x6D, Remote 1 and local hysteresis register
<7:4>, Remote 1 temperature hysteresis (4 ? C default)
<3:0>, local temperature hysteresis (4 ? C default)
Register 0x6E, Remote 2 temperature hysteresis register
<7:4>, Remote 2 temperature hysteresis (4 ? C default)
T RANGE
100%
0%
In some applications, it is required that fans continue to
run at PWM MIN , instead of turning off when the temperature
drops below T MIN . Bits <7:5> of Enhanced Acoustics
Register 1 (0x62) allow the fans to be either turned off or
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
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
PWM1
REMOTE 2 =
CPU TEMP
T MIN T RANGE
Thermal Calibration
0%
100%
MUX
PWM
MIN
Tachometer 1
Measurement
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
TACH1 CPU FAN SINK
PWM2
T MIN
100%
23
LOCAL =
VRM TEMP
1
REMOTE 1 =
AMBIENT TEMP
0%
T RANGE
Thermal Calibration
0%
T MIN
T RANGE
PWM
MIN
Tachometer 2
Measurement
Ramp Control
(Acoustic
Enhancement)
Tachometer 3
and 4
Measurement
PWM
CONFIG
PWM
Generator
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
Figure 67. The T HYST Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
Enhanced Acoustics Register 1 (0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
the temperature is below T MIN * T HYST .
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 .
Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when
the temperature is below T MIN * T HYST .
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty
cycle below T MIN * T HYST .
STEP 9: Operating Points for Temperature Channels
The operating point for each temperature channel is the
optimal temperature for that thermal zone. The hotter each
zone is allowed to be, the more quiet the system, because the
fans are not required to run as fast. The ADT7467 increases
or decreases fan speeds as necessary to maintain the
operating point temperature, allowing for system-to- system
variations and eliminating the need to design for the worst
case. If a sensible operating point value is chosen, any T MIN
value can be selected in the system characterization. If the
T MIN value is too low, the fans run sooner than required and
the temperature is below the operating point. In response,
the ADT7467 increases T MIN to keep the fans off longer and
to allow the temperature zone to approach the operating
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