Datasheet > LM95235_08

LM95235_08

更新时间： 2024-09-14 11:37:03

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
28页	553K
描述
Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm? Technology

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LM95235_08 数据手册

August 15, 2008

LM95235/LM95235Q

Precision Remote Diode Temperature Sensor with SMBus

Interface and TruTherm™ Technology

Diode Model Selection Bit - MMBT3904 or 65/90 nm

processor diodes

Two Formats: −128°C to 127.875°C and

■

General Description

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

■

2-wire System Management Bus (SMBus) interface and

0°C to 255.875°C

TruTherm technology that can monitor the temperature of a

remote diode as well as its own temperature. The LM95235

Digital filter for remote channel

■

Programmable TCRIT and OS thresholds

■

can be used to very accurately monitor the temperature of

external devices such as microprocessors, graphics proces-

sors, or a diode-connected MMBT3904 transistor. For auto-

motive applications the LM95235Q is available that is AEC-

Q100 Grade3 compliant and is manufactured on an

Automotive Grade Flow. TruTherm BJT (transistor) beta com-

pensation technology allows the LM95235 to precisely mon-

itor thermal diodes found in 90 nm and smaller geometry

processes. LM95235 reports temperature in two different for-

mats 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.

Programmable shared hysteresis register

Diode Fault Detection

Mask, Offset, and Status Registers

SMBus 2.0 compatible interface, supports TIMEOUT

Programmable conversion rate for best power

consumption

Three-level address pin

■

Standby mode one-shot conversion control

Pin-for-pin compatible with the LM86/LM89

8-pin MSOP package

Key Specifications

3.0 V to 3.6 V

350 µA (typ)

■ꢀSupply Voltage

The remote temperature channel of the LM95235 has a pro-

grammable digital filter. The LM95235 contains a diode model

selection bit to select between a typical Intel® processor on

a 65 nm or 90 nm process or MMBT3904, as well as an offset

■ꢀSupply Current, Conv. Rate = 1 Hz

■ꢀRemote Diode Temperature 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 125°C

■ꢀLocal Temperature Accuracy

ꢀT_A= 25°C to 100°C

±0.75°C (max)

±1.5°C (max)

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.

±2.0°C (max)

16 to 0.4 Hz

■ꢀConversion Rate, Both Channels

Applications

Processor/Computer System Thermal Management

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

Features

■

Remote and Local temperature channels

■

Electronic Test Equipment and Office Electronics

■

TruTherm BJT beta compensation technology

LM95235Q is AEC-Q100 Grade 3 compliant and is

manufactured on an Automotive Grade Flow

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.

201749

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