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ADT7461AARMZ-002

±1°C Temperature Monitor with Series Resistance Cancellation

ON Semiconductor 

ADT7461A

+15C Temperature Monitor

with Series Resistance

Cancellation

The ADT7461A is a dual−channel digital thermometer and

undertemperature/overtemperature alarm, intended for use in PCs and

thermal management systems. It is pin− and register−compatible with the

ADM1032 and ADT7461. A feature of the ADT7461A is series

resistance cancellation, where up to 1.5 kW (typical) of resistance in

series with the temperature monitoring diode can be automatically

cancelled from the temperature result, allowing noise filtering. The

ADT7461A has a configurable ALERT output and an extended,

switchable temperature measurement range.

The ADT7461A can measure the temperature of a remote thermal

diode accurate to ±1°C and the ambient temperature accurate to ±3°C.

The temperature measurement range defaults to 0°C to +127°C,

compatible with the ADM1032, but it can be switched to a wider

measurement range of −64°C to +191°C.

The ADT7461A communicates over a 2−wire serial interface,

compatible with system management bus (SMBus) standards. The

default SMBus address of the ADT7461A is 0x4C. An ADT7461A−2 is

available with an SMBus address of 0x4D. This is useful if more than one

ADT7461A is used on the same SMBus.

An ALERT output signals when the on−chip or remote temperature is

out of range. The THERM output is a comparator output that allows

on/off control of a cooling fan. The ALERT output can be reconfigured

as a second THERM output, if required.

Features

• On−Chip and Remote Temperature Sensor

• 0.25°C Resolution/1°C Accuracy on Remote Channel

• 1°C Resolution/1°C Accuracy on Local Channel

• Automatically Cancels Up to 1.5 kW (Typ) of Resistance in Series

with Remote Diode to Allow Noise Filtering

• Extended, Switchable Temperature Measurement Range

0°C to +127°C (Default) or –64°C to +191°C

• Pin− and Register−Compatible with ADM1032 and ADT7461

• 2−Wire SMBus Serial Interface with SMBus Alert Support

• Programmable Over/Undertemperature Limits

• Offset Registers for System Calibration

• Up to Two Overtemperature Fail−Safe THERM Outputs

• Small 8−Lead MSOP

• 240 mA Operating Current, 5 mA Standby Current

• These are Pb−Free Devices

Applications

• Desktop and Notebook Computers

• Industrial Controllers

• Smart Batteries

• Automotive

• Embedded Systems

• Burn−In Applications

• Instrumentation

© Semiconductor Components Industries, LLC, 2009

1

December, 2009 − Rev. 6

http://onsemi.com

1

MSOP−8

CASE 846AB

MARKING DIAGRAM

8

T1x

AYWG

G

1

T1x = Refer to Order Info Table

A = Assembly Location

Y = Year

W = Work Week

G = Pb−Free Package

(Note: Microdot may be in either location)

PIN ASSIGNMENT

VDD 1

D+ 2

D– 3

THERM 4

8 SCLK

7 SDATA

6 ALERT/THERM2

5 GND

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 18 of this data sheet.

Publication Order Number:

ADT7461A/D

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