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ADM1032ARMZ-001

±1°C Remote and Local System Temperature Monitor

ON Semiconductor 

ADM1032

+15C Remote and Local

System Temperature Monitor

The ADM1032 is a dual−channel digital thermometer and

under/overtemperature alarm intended for use in PCs and thermal

management systems. The device can measure the temperature of a

remote thermal diode, which can be located on the processor die or can

be a discrete device (2N3904/06), accurate to 1°C. A novel

measurement technique cancels out the absolute value of the

transistor’s base emitter voltage so that no calibration is required. The

ADM1032 also measures its ambient temperature.

The ADM1032 communicates over a 2−wire serial interface

compatible with System Management Bus (SMBus) standards.

Under/overtemperature limits can be programmed into the device over

the SMBus, and an ALERT output signals when the on−chip or remote

temperature measurement is out of range. This output can be used as

an interrupt or as a SMBus alert. The THERM output is a comparator

output that allows CPU clock throttling or on/off control of a cooling

fan. An ADM1032−1 and ADM1032−2 are available. The difference

between the ADM1032 and the ADM1032−1 is the default value of

the external THERM limit. The ADM1032−2 has a different SMBus

address. The SMBus address of the ADM1032−2 is 0x4D.

Features

• On−Chip and Remote Temperature Sensing

• Offset Registers for System Calibration

• 0.125°C Resolution/1°C Accuracy on Remote Channel

• 1°C Resolution/3°C Accuracy on Local Channel

• Fast (Up to 64 Measurements Per Second)

• 2−Wire SMBus Serial Interface

• Supports SMBus Alert

• Programmable Under/Overtemperature Limits

• Programmable Fault Queue

• Overtemperature Fail−Safe THERM Output

• Programmable THERM Limits

• Programmable THERM Hysteresis

• 170 mA Operating Current

• 5.5 mA Standby Current

• 3.0 V to 5.5 V Supply

• Small 8−Lead SOIC and MSOP Packages

• These are Pb−Free Devices

Applications

• Desktop and Notebook Computers

• Smart Batteries

• Industrial Controllers

• Telecommunications Equipment

• Instrumentation

• Embedded Systems

© Semiconductor Components Industries, LLC, 2009

1

December, 2009 − Rev. 11

http://onsemi.com

1

SOIC−8

CASE 751

MARKING

DIAGRAMS

8

1032AR

#YWW

XXXX

1

Marking #1

8

1032AR

01

#YWW

1

Marking #2

# = Pb−Free Package

Y = Year

W = Work Week

XX = Assembly Lot

8

MSOP−8

1 CASE 846AB

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

5 GND

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 16 of this data sheet.

Publication Order Number:

ADM1032/D

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