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ADT7475
Step 1: Hardware Configuration
During system design, the motherboard sensing and
control capabilities should be addressed early in the design
stages. Decisions about how these capabilities are used
should involve the system thermal/mechanical engineer.
Ask the following questions:
1. What ADT7475 functionality will be used?
? PWM2 or SMBALERT?
? TACH4 fan speed measurement or
overtemperature THERM function?
The ADT7475 offers multifunctional pins that can
be reconfigured to suit different system
requirements and physical layouts. These
multifunction pins are software programmable.
2. How many fans will be supported in the system,
three or four?
This influences the choice of whether t o use the
TACH4 pin or to reconfigure it for the THERM
function.
3. Is the CPU fan to be controlled using the
ADT7475 or will it run at full speed 100% of the
time?
If run at 100%, this frees up a PWM output, but
the system is louder.
4. Where will the ADT7475 be physically located in
the system?
This influences the assignment of the temperature
measurement channels to particular system
thermal zones. For example, locating the
ADT7475 close to the VRM controller circuitry
allows the VRM temperature to be monitored
using the local temperature channel.
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE1 =
AMBIENT TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1
CPU FAN SINK
MUX
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE2 =
CPU TEMP
Figure 43. Hardware Configuration Example
REAR CHASSIS
Recommended Implementation 1
Configuring the ADT7475 as in Figure 44 provides the
system designer with the following features:
? Two PWM outputs for fan control of up to three fans
(The front and rear chassis fans are connected in
parallel).
? Three TACH fan speed measurement inputs.
? V CC measured internally through Pin 3.
? CPU core voltage measurement (V CORE ).
? VRM temperature using local temperature sensor.
? CPU temperature measured using the Remote 1
temperature channel.
? Ambient temperature measured through the Remote 2
temperature c hannel.
? Bidirectional THERM pin, which allows the monitoring
of PROCHOT output from an
Intel ? Pentium ? 4 processor, for example, or can be used
as an overtemperature THERM output.
? SMBALERT system interrupt output.
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