LM95233 [NSC]

Dual Remote Diode and Local Temperature Sensor with SMBus Interface, TCRITs and TruTherm⑩ Technology; 双通道远程二极管和本地温度传感器，带有SMBus接口， TCRITs和TruTherm⑩技术


型号：	LM95233
厂家：	National Semiconductor
描述：	Dual Remote Diode and Local Temperature Sensor with SMBus Interface, TCRITs and TruTherm⑩ Technology 双通道远程二极管和本地温度传感器，带有SMBus接口， TCRITs和TruTherm⑩技术二极管传感器温度传感器
文件：	总5页 (文件大小：497K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ADVANCE INFORMATION

August 2006

LM95233

Dual Remote Diode and Local Temperature Sensor with

™

SMBus Interface, TCRITs and TruTherm Technology

n TruTherm technology accurately senses sub-micron

process thermal diodes

General Description

LM95233 is an 11-bit digital temperature sensor with a 2-wire

n 0.125˚C LSb temperature resolution

System Management Bus (SMBus) interface that can moni-

n 0.03125˚C LSb remote temperature resolution with

tor the temperature of two remote diodes as well as its own

digital filter enabled

temperature. The LM95233 can be used to very accurately

+127.875˚C/–128˚C and 0˚C/255˚C remote ranges

monitor the temperature of up to two external devices such

as microprocessors, graphics processors or diode-

connected 2N3904s. The LM95233’s TruTherm technology

allows sensing of 90nm or 65nm process thermal diodes

accurately.

n Programmable digital filters and analog front end filter

n Remote diode fault detection, model selection and offset

correction

n Mask and status register support

n 3 programmable TCRIT outputs with programmable

shared hysteresis

n Programmable conversion rate and shutdown mode

one-shot conversion control

n SMBus 2.0 compatible interface, supports TIMEOUT

n Three-level address pin

The LM95233 reports temperature in two different formats

for +127.875˚C/–128˚C range and 0˚C/255˚C range. The

LM95233 TCRIT1, TCRIT2 and TCRIT3 outputs are trig-

gered when any unmasked channel exceeds its correspond-

ing programmable limit and can be used to shutdown the

system, to turn on the system fans or as a microcontroller

interrupt function. The current status of the TCRIT1, TCRIT2

and TCRIT3 pins can be read back from the status registers.

Mask registers are available for further control of the TCRIT

outputs.

n 14-pin LLP package

Key Specifications

LM95233’s remote temperature channels have program-

mable digital filters to minimize unwanted TCRIT events

when temperature spikes are encountered.

Local Temperature Accuracy

2.0 ˚C (max)

0.75 ˚C (max)

Remote Diode Temperature

Accuracy

For optimum flexibility and accuracy each LM95233 channel

includes, registers for sub-micron process or 2N3904 diode

model selection as well as offset correction. A three level

address pin allows connection of up to 3 LM95233s to the

same SMBus master. The LM95233 includes power saving

functions such as: programmable conversion rate, shutdown

mode, and turn off of unused channels.

Supply Voltage

3.0 V to 3.6 V

0.5 mA (typ)

Average Supply Current (1Hz

conversion rate)

Applications

n Processor/Computer System Thermal Management

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

n Electronic Test Equipment

Features

n Accurately senses die temperature of 2 remote ICs or

n Office Electronics

diode junctions and local temperature

Connection Diagram

LLP-14

20206301

TOP VIEW

™

TruTherm is a trademark of National Semiconductor Corporation.

DS202063

www.national.com

Ordering Information

Package

Marking

95233CI

NS Package

Number

Transport

Media

Part Number

LM95233CISD

SDA14B (LLP-14)

1000 Units on Tape and Reel

4500 Units on Tape and Reel

LM95233CISDX

Simplified Block Diagram

20206302

Pin Descriptions

Label

Pin #

Function

No Connect

Typical Connection

Not connected. May be left floating, connected to

GND or V_DD

V_DD

Positive Supply Voltage

Input

DC Voltage from 3.0 V to 3.6 V. V_DDshould be

bypassed with a 0.1µF capacitor in parallel with

100pF. The 100pF capacitor should be placed as

close as possible to the power supply pin. Noise

should be kept below 200 mVp-p, a 10 µF capacitor

may be required to achieve this.

D−

No Connect

Not connected. May be left floating, connected to

GND or V_DD

Not connected. May be left floating, connected to

GND or V_DD

No Connect

Diode Return Current Sink

To all Diode Cathodes. Common D- pin for all two

remote diodes.

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Pin Descriptions (Continued)

Label

Pin #

Function

Typical Connection

D2+

Diode Current Source

To second Diode Anode. Connected to remote

discrete diode-connected transistor junction or to the

diode-connected transistor junction on a remote IC

whose die temperature is being sensed. A capacitor

is not required between D2+ and D-. A 100 pF

capacitor between D2+ and D- can be added and

may improve perfomance in noisy systems. Float

this pin if this thermal diode is not used.

To first Diode Anode. Connected to remote discrete

diode-connected transistor junction or to the

diode-connected transistor junction on a remote IC

whose die temperature is being sensed. A capacitor

is not required between D1+ and D-. A 100 pF

capacitor between D1+ and D- can be added and

may improve perfomance in noisy systems. Float

this pin if this thermal diode is not used.

System low noise ground.

D1+

Diode Current Source

GND

Power Supply Ground

Dgital Input

SMBus slave address select pin. Selects one of

three addresses. Can be tied to V_DD, GND, or to the

middle of a resistor divider connected between V_DD

and GND.

TCRIT1

TCRIT2

SMBDAT

SMBCLK

TCRIT3

Digital Output, Open-Drain

Critical temperature output 1. Requires pull-up

resistor. Active "LOW".

Critical temperature output 2. Requires pull-up

resistor. Active "LOW".

SMBus Bi-Directional Data

Line, Open-Drain Output

SMBus Clock Input

From and to Controller; may require an external

pull-up resistor

From Controller; may require an external pull-up

resistor

Digital Output, Open-Drain

Critical temperature output 3. Requires pull-up

resistor. Active "LOW".

www.national.com

Typical Application

20206303

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Physical Dimensions inches (millimeters)

unless otherwise noted

14-Lead Molded Leadless Leadframe Package (LLP),

Order Number LM95233CISD or LM95233CISDX

NS Package Number SDA14B

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS

WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body, or

(b) support or sustain life, and whose failure to perform when

properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to result

in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be reasonably

expected to cause the failure of the life support device or

system, or to affect its safety or effectiveness.

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and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:

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LM95233 [NSC]

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