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ADT7476
Mux Configuration Example
This is an example of how to configure the mux in a
system using the ADT7476 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 behavior:
? PWM1 (CPU fan sink) is controlled by the fastest speed
calculated by the local (VRM temperature) and
Remote 2 (processor) temperature. In this case, the
CPU fan sink is also being 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).
Example Mux Settings
[7:5] (BHVR), PWM1 Configuration Register (0x5C).
101 = Fastest speed calculated by local and Remote 2
temperature controls PWM1
[7:5] (BHVR), PWM2 Configuration Register (0x5D).
000 = Remote 1 temperature controls PWM2
[7:5] (BHVR), PWM3 Configuration Register (0x5E).
000 = Remote 1 temperature controls PWM3
These settings configure the mux, as shown in Figure 52.
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
MUX
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1 CPU FAN SINK
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 52. Mux Configuration Example
http://onsemi.com
36
REAR CHASSIS
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