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ADT7473
Other Mux Options
Remote 2 (processor) temperature. In this case, the
Bits <7:5> (BHVR), Register 0x5C, Register 0x5D,
Register 0x5E.
011 = PWMx runs full speed (default for ADT7473 ? 1)
100 = PWMx disabled (default for ADT7473)
111 = manual mode
?
?
CPU fan sink is also used to cool the VRM.
PWM2 (front chassis fan) is controlled by the Remote 1
temperature (ambient).
PWM3 (rear chassis fan) is controlled by the Remote 1
temperature (ambient).
In normal mode, PWMx runs under software control. In
this mode, PWM duty cycle registers (Register 0x30 to
Register 0x32) are writable and control the PWM outputs.
Mux Configuration Example
This is an example of how to configure the mux in a
system using the ADT7473/ADT7473 ? 1 to control three
fans. The CPU fan sink is controlled by PWM1, the front
chassis fan is controlled by PWM2, and the rear chassis fan
is controlled by PWM3. The mux is configured for the
following fan control behaviors:
? PWM1 (CPU fan sink) is controlled by the fastest speed
calculated by the local (VRM temperature) and
Example Mux Settings
Bits <7:5> (BHVR), PWM1 Configuration Register (0x5C)
101 = Fastest speed calculated by local and Remote 2
temperature controls PWM1
Bits <7:5> (BHVR), PWM2 Configuration Register (0x5D)
000 = Remote 1 temperature controls PWM2
Bits <7:5> (BHVR), PWM3 Configuration Register (0x5E)
000 = Remote 1 temperature controls PWM3
These settings configure the mux, as shown in Figure 51.
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%
MUX
PWM
MIN
TACHOMETER1
MEASUREMENT
RAMP
PWM
CONFIG
TACH1
CPU FAN SINK
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 51. Mux Configuration Example
REAR CHASSIS
Step 3: T MIN Settings for Thermal Calibration Channels
T MIN is the temperature at which the fans start to turn on
under automatic fan control. The speed at which the fan runs
at T MIN is programmed later. The T MIN values chosen are
temperature channel specific, for example, 25 ? C for
ambient channel, 30 ? C for VRM temperature, and 40 ? C for
processor temperature.
T MIN is an 8-bit value, either twos complement or Offset
64, that can be programmed in 1 ? C increments. A T MIN
register is associated with each temperature measurement
channel: Remote 1 local and Remote 2 temperature. Once
the T MIN value is exceeded, the fan turns on and runs at the
minimum PWM duty cycle. The fan turns off once the
temperature drops below T MIN ? T HYST .
To overcome fan inertia, the fan is spun up until two valid
TACH rising edges are counted. See the Fan Startup
Timeout section for more details. In some cases, primarily
for psycho-acoustic reasons, it is desirable that the fan never
switches off below T MIN . Bits <7:5> of Enhanced Acoustics
Register 1 (0x62), when set, can keep the fans running at the
PWM minimum duty cycle, if the temperature falls below
T MIN .
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