LM95221CIMMX NSC [National Semiconductor], LM95221CIMMX Datasheet

LM95221CIMMX

Manufacturer Part Number

LM95221CIMMX

Description

Dual Remote Diode Digital Temperature Sensor with SMBus Interface

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM95221CIMMX.pdf (16 pages)

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Company:

Meier Automation Equipment Co., Limited

Part Number:

LM95221CIMMX

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NS/国半

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LM95221

Dual Remote Diode Digital Temperature Sensor with

SMBus Interface

General Description

The LM95221 is a dual remote diode temperature sensor in

an 8-lead MSOP package. The 2-wire serial interface of the

LM95221 is compatible with SMBus 2.0. The LM95221 can

sense three temperature zones, it can measure the tempera-

ture of its own die as well as two diode connected transis-

tors. The diode connected transistors can be a thermal diode

as found in Pentium and AMD processors or can simply be a

diode connected MMBT3904 transistor. The LM95221 reso-

lution format for remote temperature readings can be pro-

grammed to be 10-bits plus sign or 11-bits unsigned. In the

unsigned mode the LM95221 remote diode readings can

resolve temperatures above 127˚C. Local temperature read-

ings have a resolution of 9-bits plus sign.

The temperature of any ASIC can be accurately determined

using the LM95221 as long as a dedicated diode (semicon-

ductor junction) is available on the target die. The LM95221

remote sensor accuracy of

series resistance of 2.7 ohms and 1.008 non-ideality factor.

Features

n Accurately senses die temperature of remote ICs or

n Remote diode fault detection

n On-board local temperature sensing

n Remote temperature readings:

Simplified Block Diagram

Pentium

diode junctions

— 0.125 ˚C LSb

— 10-bits plus sign or 11-bits programmable resolution

™

is a trademark of Intel Corporation.

1˚C is factory trimmed for a

DS200943

n Local temperature readings:

n Status register support

n Programmable conversion rate allows user optimization

n Shutdown mode one-shot conversion control

n SMBus 2.0 compatible interface, supports TIMEOUT

n 8-pin MSOP package

Key Specifications

Applications

n Processor/Computer System Thermal Management

n Electronic Test Equipment

n Office Electronics

of power consumption

— 11-bits resolves temperatures above 127 ˚C

— 0.25 ˚C

— 9-bits plus sign

Local Temperature Accuracy

Remote Diode Temperature Accuracy

Supply Voltage

Supply Current

(e.g. Laptop, Desktop, Workstations, Server)

=30˚C to 50˚C, T

=0˚C to 85˚C, T

=25˚C to 140˚C

=45˚C to 85˚C

=0˚C to 85˚C

20094301

3.0 V to 3.6 V

www.national.com

3.0 ˚C (max)

1.0 ˚C (max)

3.0 ˚C (max)

2 mA (typ)

May 2004

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