LM95221CIMMX Datasheet

IC型號：
LM95221CIMMX
PDF描述：
Dual Remote Diode Digital Temperature Sensor with SMBus Inte...
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NSC

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LM95221 Dual Remote Diode Digital Temperature Sensor with SMBus Interface

May 2004

LM95221

Dual Remote Diode Digital Temperature Sensor with

SMBus Interface

General Description

The LM95221 is a dual remote diode temperature sensor in

an 8-lead MSOP package. The 2-wire serial interface of the

LM95221 is compatible with SMBus 2.0. The LM95221 can

sense three temperature zones, it can measure the tempera-

ture of its own die as well as two diode connected transis-

tors. The diode connected transistors can be a thermal diode

as found in Pentium and AMD processors or can simply be a

diode connected MMBT3904 transistor. The LM95221 reso-

lution format for remote temperature readings can be pro-

grammed to be 10-bits plus sign or 11-bits unsigned. In the

unsigned mode the LM95221 remote diode readings can

resolve temperatures above 127藲C. Local temperature read-

ings have a resolution of 9-bits plus sign.

The temperature of any ASIC can be accurately determined

using the LM95221 as long as a dedicated diode (semicon-

ductor junction) is available on the target die. The LM95221

remote sensor accuracy of

鹵

1藲C is factory trimmed for a

series resistance of 2.7 ohms and 1.008 non-ideality factor.

鈥?11-bits resolves temperatures above 127 藲C

Local temperature readings:

鈥?0.25 藲C

鈥?9-bits plus sign

Status register support

Programmable conversion rate allows user optimization

of power consumption

Shutdown mode one-shot conversion control

SMBus 2.0 compatible interface, supports TIMEOUT

8-pin MSOP package

Key Specifications

Local Temperature Accuracy

=0藲C to 85藲C

Remote Diode Temperature Accuracy

鹵

3.0 藲C (max)

鹵

1.0 藲C (max)

鹵

3.0 藲C (max)

3.0 V to 3.6 V

2 mA (typ)

=30藲C to 50藲C, T

=45藲C to 85藲C

=0藲C to 85藲C, T

=25藲C to 140藲C

Supply Voltage

Supply Current

Features

Accurately senses die temperature of remote ICs or

diode junctions

Remote diode fault detection

On-board local temperature sensing

Remote temperature readings:

鈥?0.125 藲C LSb

鈥?10-bits plus sign or 11-bits programmable resolution

Applications

Processor/Computer System Thermal Management

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

Electronic Test Equipment

Office Electronics

Simplified Block Diagram

20094301

Pentium

鈩?/div>

is a trademark of Intel Corporation.

漏 2004 National Semiconductor Corporation

DS200943

www.national.com

制造商
National Semiconductor (TI)
輸出類型
Digital
準(zhǔn)確性
+/- 1 C, +/- 3 C
數(shù)字輸出 - 總線接口
Serial (2-Wire)
最大工作溫度
+ 85 C
最小工作溫度
0 C
封裝
Reel
描述/功能
Temperature Sensor
數(shù)字輸出 - 位數(shù)
9 bit+ Sign, 10 bit+ Sign
工作電源電壓
3 V to 3.6 V
工廠包裝數(shù)量
3500

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LM95221CIMMX Datasheet

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