ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 37

• Manufacturer Part Number: ADT7473
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

Mux Configuration Example
This is an example of how to conf
using the ADT7473 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 Remote 2
(processor) temperature. In this case, the CPU fan sin
also used to cool the VRM.
PWM2 (front chassis fan) is controlled by the Remote 1
temperature (ambient).
PWM3 (r
temperature (ambient).
AMBIENT TEMP
ear chassis fan) is controlled by the Remote 1
REMOTE 2 =
REMOTE 1 =
VRM TEMP
CPU TEMP
LOCAL =
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
MIN
MIN
MIN
igure the mux in a system
T
T
T
RANGE
RANGE
RANGE
100%
100%
100%
0%
0%
0%
Figure 48. Mux Configuration Example
k is
MUX
Rev. A | Page 37 of 76
PW
PWM
PWM
MIN
MIN
MIN
Example Mux Settings
Bits [7:5] (BHVR), PWM1 Configuration Register (0x5C)
Bits [7:5] (BHVR), PWM2 Configuration
Bits [7:5] (BHVR), PWM3 Configura
These settings configure the mux, as shown in Figure 48.
M
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER
MEASUREME
TACHOMETER 2
MEASUREMENT
TACHOMETER 3
MEASUREMENT
101 = Fastest speed calculated by local and Remote
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
NT
1
GENERATOR
GENERATOR
GENERATOR
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
tion Register (0x5E)
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK
Register (0x5D)
ADT7473
2