ADT7461 datasheet(20/24 Pages) AD

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ADT7461

•

For really long distances (up to 100 feet), use shielded

twisted pair, such as Belden No. 8451 microphone cable.

Connect the twisted pair to D+ and D− and the shield to

GND close to the ADT7461. Leave the remote end of the

shield unconnected to avoid ground loops.

Because the measurement technique uses switched current

sources, excessive cable or filter capacitance can affect the

measurement. When using long cables, the filter capacitance

may be reduced or removed.

APPLICATION CIRCUIT

Figure 23

Figure 23. Typical Application Circuit

shows a typical application circuit for the ADT7461,

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 already provided elsewhere in

the system.

The SCLK and SDATA pins of the ADT7461 can be interfaced

directly to the SMBus of an I/O controller, such as the Intel 820

chipset.

SHIELD

2N3906

CPU THERMAL

DIODE

ALERT/

THERM2

GND

THERM

D+

D–

ADT7461

SCLK

SDATA

VDD

3V TO 3.6V

TYP 10k

Ω

TYP 10k

Ω

0.1

µF

FAN

CONTROL

CIRCUIT

FAN

ENABLE

SMBUS

CONTROLLER

5V OR 12V

Rev. 0 | Page 20 of 24

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