ADT7476ARQZ-R7 datasheet(34/67 Pages) ONSEMI

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ADT7476

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Recommended Implementation 1

Configuring the ADT7476 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.

• 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 from an Intel P4 processor, for

example, or can be used as an overtemperature THERM

output.

• SMBALERT system interrupt output.

Figure 49. Recommended Implementation 1

FRONT

CHASSIS

FAN

TACH2

ADT7476A

PWM3

REAR

CHASSIS

FAN

AMBIENT

TEMPERATURE

TACH3

D1+

D1–

VCC

+5VIN

+12VIN/VID5

GND

PWM1

TACH1

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

D2+

D2–

THERM

SMBALERT

SDA

SCL

PROCHOT

5(VRM9)/6(VRM10)

CPU FAN

CPU

ICH

ADT7476ARQZ-R7 Datasheet(PDF) 34 Page - ON Semiconductor

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