ADT7476AARQZ-R datasheet(37/69 Pages) ONSEMI

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ADT7476A

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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.

• VCC measured internally through Pin 4.

• CPU core voltage measurement (VCORE).

• 2.5 V measurement input used to monitor CPU current

(connected to VCOMP 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

VCC

+5VIN

+12VIN/VID5

VID[0:4]/VID[0:5]

5(VRM9)/6(VRM10)

PWM2

ADT7476AARQZ-R Datasheet(PDF) 37 Page - ON Semiconductor

ADT7476AARQZ-R Datasheet(HTML) 37 Page - ON Semiconductor

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