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Recommended Implementation 1
Configuring the ADT7476A as shown in Figure 49
provides the system designer with the following features:
•
Six VID inputs (VID0, VID1, VID2, VID3, VID4, and
VID6) for VRM10 support.
•
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
measured internally through Pin 4.
CC
•
CPU core voltage measurement (V
•
2.5 V measurement input used to monitor CPU current
(connected to V
controller). This is used to determine CPU power
consumption.
FRONT
CHASSIS
REAR
CHASSIS
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).
CORE
output of ADP316x VRM
COMP
FAN
FAN
AMBIENT
TEMPERATURE
Figure 49. Recommended Implementation 1
ADT7476A
•
5.0 V measurement input.
•
VRM temperature using local temperature sensor.
•
CPU temperature measured using the Remote 1
temperature channel.
•
Ambient temperature measured through the Remote 2
temperature channel.
•
If not using VID5, it can be reconfigured as the 12 V
monitoring input.
•
Bidirectional THERM pin allows the monitoring of
PROCHOT output from an Intel P4 processor, for
example, or can be used as an overtemperature THERM
output.
•
SMBALERT system interrupt output.
ADT7476A
PWM1
TACH2
TACH1
VID[0:4]/VID[0:5]
PWM3
D2+
TACH3
D2−
THERM
D1+
D1−
SDA
SCL
SMBALERT
V
CC
+5V
IN
+12V
/VID5
IN
GND
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CPU FAN
5(VRM9)/6(VRM10)
PROCHOT
CPU
ICH
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