ADT7476A
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37
Recommended Implementation 2
Configuring the ADT7476A as shown in Figure 50
provides the system designer with the following features:
•
Six VID inputs (VID0, VID1, VID2, VID3, VID4, and
VID6) for VRM10 support.
•
Three PWM outputs for fan control of up to three fans.
All three fans can be individually controlled.
•
Three TACH fan speed measurement inputs.
•
V
CC
measured internally through Pin 4.
•
CPU core voltage measurement (V
CORE
).
•
2.5 V measurement input used to monitor CPU current
(connected to V
COMP
output of ADP316x VRM
controller). This is used to determine CPU power
consumption.
•
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/input from an Intel P4 processor,
for example, or can be used as an overtemperature
THERM output.
Figure 50. Recommended Implementation 2
CPU FAN
CPU
FRONT
CHASSIS
FAN
TACH2
ADT7476A
PWM3
REAR
CHASSIS
FAN
AMBIENT
TEMPERATURE
TACH3
D1+
D1−
GND
PWM1
TACH1
D2+
D2−
ICH
SDA
SCL
THERM
PROCHOT
V
CC
+5V
IN
+12V
IN
/VID5
VID[0:4]/VID[0:5]
5(VRM9)/6(VRM10)
PWM2
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