ADT7461A

Rev. A | Page 21 of 24

APPLICATION CIRCUIT

Figure 24 shows a typical application circuit for the ADT7461A,

using a discrete sensor transistor connected via a shielded, twisted

pair cable. The pull-ups on SCLK, SDATA, and ALERT are

required only if they are not provided elsewhere in the system.

The SCLK pin and the SDATA pin of the ADT7461A can be

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

the Intel® 820 chipset.

5V OR 12V

SMBUS

CONTROLLER

FAN CONTROL

CIRCUIT

2N3906

OR

CPU THERMAL

DIODE

D+

D–

SCLK

SDATA

ALERT/

THERM2

THERM

GND

TYP 10kΩ

FAN ENABLE

3V TO 3.6V

TYP 10kΩ

SHIELD

Figure 24. Typical Application Circuit