ADT7421ARMZ-2RL View Datasheet(PDF) - ON Semiconductor

Part Name

Description

MFG CO.

ADT7421ARMZ-2RL

Precision Temperature Sensor with Beta Compensation (for <45 nm Geometries)

ON Semiconductor 

ADT7421

Precision Temperature

Sensor with Beta

Compensation

(for <45 nm Geometries)

The ADT7421 is a dual−channel digital thermometer and

under/overtemperature alarm, intended for use in PCs and thermal

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

ADM1032, ADT7461 and ADT7461A.

The ADT7421 includes Beta Cancellation Technology. This enables

accurate measurement of temperature from very small geometry

(45 nm) processes. Significant variations in the Beta factor can be

observed when different currents are applied to transistors embedded

in small geometry CPU’s. This leads to large temperature errors. The

ADT7421 automatically cancels the effects of error induced by beta

variations.

Features

• On−Chip and Remote Temperature Sensor

• 0.25°C Resolution on Remote Channel

• 1°C Resolution on Local Channel

• Automatically Cancels the Effect of Beta Variation in Thermal

Transistors on Small Geometry CPU’s

• Automatically Cancels Up to 50 W (Typical) of Resistance in Series

with Remote Transistor

• Extended, Switchable Temperature Measurement Range

0°C to +125°C (default) or −40°C to +125°C

• Pin− and Register−Compatible with ADM1032, ADT7461,

ADT7461A, EMC1402, and aSC7525

• 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 and SOP Packages

• These are Pb−Free Devices

Applications

• Desktop and Notebook Computers

• Industrial Controllers

• Smart Batteries

• Automotive

• Embedded Systems

• Burn−In Applications

• Instrumentation

http://onsemi.com

MARKING

DIAGRAMS

SOIC−8

1

CASE 751

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

R = SMBus Address

G = Pb−Free Package

8

T7421

ALYWRG

G

1

8

1

MSOP−8

CASE 846AB

L7x

AYWG

G

L7x = Refer to Ordering Table 1

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.

© Semiconductor Components Industries, LLC, 2010

1

January, 2010 − Rev. 5

Publication Order Number:

ADT7421/D

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