ADT7481

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19

Application Circuit

Figure 22 shows a typical application circuit for the

ADT7481, using discrete sensor transistors. The pullups on

SCLK, SDATA, and ALERT are required only if they are not

already provided elsewhere in the system.

The SCLK and SDATA pins of the ADT7481 can be

interfaced directly to the SMBus of an I/O controller, such

as the Intel

® 820 chipset.

Figure 22. Typical Application Circuit

5.0 V or 12 V

SMBUS

CONTROLLER

FAN CONTROL

CIRCUIT

2N3904/06

OR

CPU THERMAL

DIODE

D1+

D1–

D2+

D2–

SCLK

SDATA

ALERT

THERM

GND

ADT7481

0.1mF

TYP 10kW

FAN ENABLE

3.0 to 3.6 V

TYP 10kW

ORDERING INFORMATION

Device Order Number*

Package Type

Branding

SMBus Address

ADT7481ARMZ

10-Lead MSOP

50 Tube

T08

4C

ADT7481ARMZ-REEL

10-Lead MSOP

3000 Tape & Reel

T08

4C

ADT7481ARMZ-R7

10-Lead MSOP

1000 Tape & Reel

T08

4C

ADT7481ARMZ-001

10-Lead MSOP

50 Tube

T0M

4B

ADT7481ARMZ-1RL

10-Lead MSOP

3000 Tape & Reel

T0M

4B

ADT7481ARMZ-1R7

10-Lead MSOP

1000 Tape & Reel

T0M

4B

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

*The “Z’’ suffix indicates Pb−Free package available.