LM99

更新时间： 2024-09-24 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
20页	345K
描述
【1C Accurate, High Temperature, Remote Diode Temperature Sensor with Two-Wire Interface

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LM99 数据手册

July 2003

LM99

1˚C Accurate, High Temperature, Remote Diode

Temperature Sensor with Two-Wire Interface

n On-board local temperature sensing

n 10 bit plus sign remote diode temperature data format,

0.125 ˚C resolution

n T_CRIT_A output useful for system shutdown

n ALERT output supports SMBus 2.0 protocol

n SMBus 2.0 compatible interface, supports TIMEOUT

n 8-pin MSOP package

General Description

The LM99 is an 11-bit remote diode temperature sensor with

a 2-wire System Management Bus (SMBus) serial interface.

The LM99 accurately measures: (1) its own temperature and

(2) the temperature of a remote diode-connected transistor

such as the 2N3904 or a thermal diode commonly found on

Graphics Processor Units (GPU), Computer Processor Units

(CPU or other ASICs. The LM99 remote diode temperature

sensor shifts the temperature from the remote sensor down

16˚C and operates on that shifted temperature:

Key Specifications

Supply Voltage

3.0 V to 3.6 V

0.8 mA (typ)

T_{ACTUAL DIODE JUNCTION}= T_LM99+ 16˚C

Supply Current

The local temperature reading requires no offset.

Local Temp Accuracy (includes quantization error)

The LM99 has an Offset Register which provides a means

for precise matching to various thermal diodes. Contact

T_A= 25˚C to 125˚C

3.0˚C (max)

hardware.monitor nsc.com for the latest details.

Remote Diode Temp Accuracy (includes quantization

The LM99 and LM99-1 have the same functions but different

SMBus slave addresses. This allows for one of each to be on

the same bus at the same time.

error)

T_A= 30˚C to 50˚C, T_D= 120˚C to 140˚C

T_A= 0˚C to 85˚C, T_D= 25˚C to 140˚C

1.0˚C (max)

3.0˚C (max)

Activation of the ALERT output occurs when any tempera-

ture goes outside a preprogrammed window set by the HIGH

and LOW temperature limit registers or exceeds the T_CRIT

temperature limit. Activation of the T_CRIT_A occurs when

any temperature exceeds the T_CRIT programmed limit.

Applications

n Graphics Processor Thermal Management

n Computer Processor Thermal Management

n Electronic Test Equipment

Features

n Office Electronics

n Accurately senses the temperature of remote diodes

n Offset register allows use of a variety of thermal diodes

Simplified Block Diagram

20053801

NVIDIA^®is a registered trademark of NVIDIA Corporation.

™

GeForce is a trademark of NVIDIA Corporation.

Intel^®and Pentium^®are registered trademarks of Intel Corporation.

DS200538

www.national.com

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与LM99相关器件

型号	品牌	获取价格	描述	数据表
LM99-1CIMM	NSC	获取价格	【1C Accurate, High Temperature, Remote Diode
LM99-1CIMM/NOPB	NSC	获取价格	Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, SQUA
LM99-1CIMM/NOPB	TI	获取价格	采用 TruTherm 技术且具有 SMBus 接口的远程和本地温度传感器 \| DGK \|
LM99-1CIMMX	NSC	获取价格	【1C Accurate, High Temperature, Remote Diode
LM99CIMM	NSC	获取价格	【1C Accurate, High Temperature, Remote Diode
LM99CIMM/NOPB	NSC	获取价格	暂无描述
LM99CIMM/NOPB	TI	获取价格	采用 TruTherm 技术且具有 SMBus 接口的远程和本地温度传感器 \| DGK \|
LM99CIMMX	NSC	获取价格	【1C Accurate, High Temperature, Remote Diode
LM99CIMMX/NOPB	TI	获取价格	采用 TruTherm 技术且具有 SMBus 接口的远程和本地温度传感器 \| DGK \|
LM9N20LD	LEIDITECH	获取价格	N-Channel Enhancement Mode Power MOSFET

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