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ADT7467ARQZ-R7 Datasheet(PDF) 41 Page - ON Semiconductor

Part # ADT7467ARQZ-R7
Description  dBCool Remote Thermal Monitor and Fan Controller
PDF  77 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7467ARQZ-R7 Datasheet(HTML) 41 Page - ON Semiconductor

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ADT7467
Rev. 3 | Page 41 of 77 | www.onsemi.com
Mux Configuration Example
This is an example of how to configure the mux in a system
using the ADT7467 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 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 56.
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
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
MUX
Figure 56. Mux Configuration Example



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