LM84

更新时间： 2024-11-01 22:47:03

品牌	Logo	应用领域
美国国家半导体 - NSC		二极管传感器温度传感器
页数	文件大小	规格书
16页	171K
描述
Diode Input Digital Temperature Sensor with Two-Wire Interface

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LM84 数据手册

July 2000

LM84

Diode Input Digital Temperature Sensor with Two-Wire

Interface

n Register readback capability

n 7 bit plus sign temperature data format

n 2 address select lines enable 9 LM84s to be connected

to a single bus

General Description

The LM84 is

a remote diode temperature sensor,

Delta-Sigma analog-to-digital converter, and digital

over-temperature detector with an SMBus interface. The

™

LM84 senses its own temperature as well as the tempera-

ture of a target IC with a diode junction, such as a Pentium^®

II processor or a diode connected 2N3904. A diode junction

(semiconductor junction) is required on the target IC’s die. A

host can query the LM84 at any time to read the temperature

of this diode as well as the temperature state of the LM84

itself. A T_CRIT_A interrupt output becomes active when the

temperature is greater than a programmable comparator

limit, T_CRIT.

Key Specifications

Supply Voltage

3.0V - 3.6V

1 mA (max)

Supply Current

Local Temperature Accuracy

Remote Diode Temperature Accuracy

+60˚C to +100˚C

1.0˚C (typ)

3˚C (max)

5˚C (max)

0˚C to +125˚C

The host can program as well as read back the state of the

T_CRIT register. Three state logic inputs allow two pins

(ADD0, ADD1) to select up to 9 SMBus address locations for

the LM84. The sensor powers up with default thresholds of

127˚C for T_CRIT.

Applications

n System Thermal Management

n Personal Computers

n Electronic Test Equipment

n Office Electronics

Features

n Directly senses die temperature of remote ICs

n Senses temperature of remote diodes

n SMBus compatible interface, supports SMBus Timeout

n HVAC

Simplified Block Diagram

DS100961-1

# Indicates Active Low (”NOT“)

™

SMBus is a trademark of the Intel Corporation.

Pentium^®II processor is a registered trademark of the Intel Corporation.

C^®is a registered trademark of the Philips Corporation.

DS100961

www.national.com

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