ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 34

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

ADT7473
STEP 1: HARDWARE CONFIGUR
During system design, the motherboard sensing and control
capabilities should be addressed early
Decisions about how these capabilities are used should involve
the ystem thermal/mechanical engineer. Consider the
follo
1.
s
wing questions:
What ADT7473 functionality will be used?
•
•
The ADT7473 offers multifunctional pins that can be
reconfigured to suit different system requirements and
physical layouts. These multifunction pins are software
programmable.
PWM2 or SMBALERT ?
TACH4 fan speed measurement or overtemperature
THERM function?
AMBIENT TEMP
REMOTE 1 =
REMOTE 2 =
VRM TEMP
CPU TEMP
LOCAL =
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
MIN
MIN
MIN
in the design stages.
ATION
T
T
T
RANGE
RANGE
RANGE
100%
100%
100%
0%
0%
0%
Figure 45. Hardware Configuration Example
MUX
Rev. A | Page 34 of 76
PWM
PWM
PWM
MIN
MIN
MIN
2.
3.
4.
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
MEASUREMENT
How many fans will be supported in the system, three or
four? This influences the choice of whether to us
TACH4 pin or to reconfigure it for the THERM function.
Is the CPU fan to be controlled using the ADT7473 or will
it run at full speed 100% of the time?
If run at full speed, 100% of the time, this frees up a PWM
output, but the system is louder.
Where will the ADT7473 be physically located in the
system?
This influen
measurement channels to particular sy
For example, locating the ADT7473 close to the VRM
controller circuitry allows the VRM temperature to be
monitored using the local temperature channel.
TACHOMETER 3
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
RAMP
RAMP
RAMP
AND 4
ces the assignment of the t
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
emperature
stem thermal zones.
e the