LM95235

更新时间： 2024-09-14 03:51:39

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
25页	797K
描述
Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology

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LM95235 数据手册

May 2006

LM95235

Precision Remote Diode Temperature Sensor with

™

SMBus Interface and TruTherm Technology

n Two Formats: −128˚C to +127.875˚C and 0˚C to 255˚C

n Digital filter for remote channel

General Description

The LM95235 is an 11-bit digital temperature sensor with a

2-wire System Management Bus (SMBus) interface and Tru-

Therm technology that can monitor the temperature of a

remote diode as well as its own temperature. The LM95235

can be used to very accurately monitor the temperature of

external devices such as microprocessors, graphics proces-

sors, or a diode-connected MMBT3904 transistor. TruTherm

technology allows the LM95235 to precisely monitor thermal

diodes found in 90 nm and smaller geometry processes.

LM95235 reports temperature in two different formats for

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

LM95235 T_CRIT and OS outputs are asserted when either

unmasked channel exceeds its programmed 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 T_CRIT and OS pins can be read back from the status

registers via the SMBus interface. All limits have a shared

programmable hysteresis register.

n Programmable TCRIT and OS thresholds

n Programmable shared hysteresis register

n Diode Fault Detection

n Mask, Offset, and Status Registers

n SMBus 2.0 compatible interface, supports TIMEOUT

n Programmable conversion rate for best power

consumption

n Three-level address pin

n Standby mode one-shot conversion control

n Pin-for-pin compatible with the LM86/LM89

n 8-pin MSOP package

Key Specifications

Supply Voltage

3.0 V to 3.6 V

350 µA (typ)

Supply Current, Conv. Rate = 1 Hz

Remote Diode Temperature Accuracy

The remote temperature channel of the LM95235 has a

programmable digital filter. The LM95235 contains a diode

model selection bit to select between a typical Intel^®proces-

sor on a 65 nm or 90 nm process or MMBT3904, as well as

an offset register for maximum flexibility and best accuracy.

T_A= 25˚C to 85˚C; T_D= 60˚C to 100˚C

T_A= 25˚C to 85˚C; T_D= 40˚C to 120˚C

0.75˚C (max)

1.5˚C (max)

Local Temperature Accuracy

T_A= 25˚C to 100˚C

2.0˚C (max)

16 to 0.4 Hz

The LM95235 has a three-level address pin to connect up to

3 devices to the same SMBus master, that is shared with the

OS output. The LM95235 has a programmable conversion

rate register and a standby mode to save power. One con-

version can be triggered in standby mode by writing to the

one-shot register.

Conversion Rate, Both Channels

Applications

n Processor/Computer System Thermal Management

(e.g. Laptops, Desktops, Workstations, Servers)

n Electronic Test Equipment

Features

n Office Electronics

n Remote and Local temperature channels

n Diode Model Selection Bit - MMBT3904 or 65/90 nm

processor diodes

Connection Diagram

MSOP-8

20174902

TOP VIEW

™

TruTherm is a trademark of National Semiconductor Corporation.

Intel^®is a registered trademark of Intel Corporation.

Pentium^®is a registered trademark of Intel Corporation.

Intel^®Core Duo is a trademark of Intel Corporation.

™

Intel^®Core Solo is a trademark of Intel Corporation.

™

DS201749

www.national.com

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