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ADT7476ARQZ-R7 Datasheet(PDF) 37 Page - ON Semiconductor

Part # ADT7476ARQZ-R7
Description  dBCOOL Remote Thermal Controller and Voltage Monitor
PDF  67 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7476ARQZ-R7 Datasheet(HTML) 37 Page - ON Semiconductor

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ADT7476
http://onsemi.com
37
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.
Figure 52. Mux Configuration Example
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
LOCAL =
VRM TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
REMOTE 1 =
AMBIENT TEMP
REMOTE 2 =
CPU TEMP
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
PWM
MIN
PWM
MIN
PWM
MIN
100%
MUX
PWM
GENERATOR
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM
CONFIG
PWM
CONFIG
PWM
CONFIG



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