ADT7467 Analog Devices, Inc., ADT7467 Datasheet - Page 41

• Manufacturer Part Number: ADT7467
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

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).
AMBIENT TEMP
REMOTE 2 =
REMOTE 1 =
VRM TEMP
CPU TEMP
LOCAL =
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
MIN
MIN
MIN
T
T
T
RANGE
RANGE
RANGE
100%
100%
100%
0%
0%
0%
Figure 56. Mux Configuration Example
MUX
Rev. A| Page 41 of 80
PWM
PWM
PWM
MIN
MIN
MIN
Example Mux Settings
<7:5> (BHVR), PWM1 Configuration Register 0x5C
<7:5> (BHVR), PWM2 Configuration Register 0x5D
<7:5> (BHVR), PWM3 Configuration Register 0x5E
These settings configure the mux as shown in Figure 56.
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
MEASUREMENT
TACHOMETER 3
101 = fastest speed calculated by local and Remote 2
temperature controls PWM1
000 = Remote 1 temperature controls PWM2
000 = Remote 1 temperature controls PWM3
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
RAMP
RAMP
RAMP
AND 4
GENERATOR
GENERATOR
GENERATOR
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK
ADT7467