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LM50

SOT-23 Single-Supply Centigrade Temperature Sensor

General Description

The LM50 is a precision integrated-circuit temperature sen-

sor that can sense a −40˚C to +125˚C temperature range us-

ing a single positive supply. The LM50’s output voltage is lin-

early proportional to Celsius (Centigrade) temperature

(+10 mV/˚C) and has a DC offset of +500 mV. The offset al-

lows reading negative temperatures without the need for a

negative supply. The ideal output voltage of the LM50 ranges

from +100 mV to +1.75V for a −40˚C to +125˚C temperature

range. The LM50 does not require any external calibration or

trimming to provide accuracies of

3˚C at room temperature

and

4˚C over the full −40˚C to +125˚C temperature range.

Trimming and calibration of the LM50 at the wafer level as-

sure low cost and high accuracy. The LM50’s linear output,

+500 mV offset, and factory calibration simplify circuitry re-

quired in a single supply environment where reading nega-

tive temperatures is required. Because the LM50’s quiescent

current is less than 130 µA, self-heating is limited to a very

low 0.2˚C in still air.

Applications

n Computers

n Disk Drives

n Battery Management

n Automotive

n FAX Machines

n Printers

n Portable Medical Instruments

n HVAC

n Power Supply Modules

Features

n Calibrated directly in degree Celsius (Centigrade)

n Linear + 10.0 mV/˚C scale factor

2˚C accuracy guaranteed at +25˚C

n Specified for full −40˚ to +125˚C range

n Suitable for remote applications

n Low cost due to wafer-level trimming

n Operates from 4.5V to 10V

n Less than 130 µA current drain

n Low self-heating, less than 0.2˚C in still air

n Nonlinearity less than 0.8˚C over temp

Connection Diagram

Order SOT-23 Supplied As

Number Device Marking

LM50BIM3 T5B 1000 Units on Tape

and Reel

LM50CIM3 T5C 1000 Units on Tape

and Reel

LM50BIM3X T5B 3000 Units on Tape

and Reel

LM50CIM3X T5C 3000 Units on Tape

and Reel

Typical Application

SOT-23

DS012030-1

Top View

See NS Package Number MA03B

DS012030-3

FIGURE 1. Full-Range Centigrade Temperature Sensor (−40˚C to +125˚C)

July 1999

LM50 SOT-23 Single-Supply Centigrade Temperature Sensor

1 2 3 4 5 6 7

Resumo do Conteúdo

Página 1 - Typical Application

LM50SOT-23 Single-Supply Centigrade Temperature SensorGeneral DescriptionThe LM50 is a precision integrated-circuit temperature sen-sor that can sense

Página 2 - Electrical Characteristics

Absolute Maximum Ratings (Note 1)Supply Voltage +12V to −0.2VOutput Voltage (+VS+ 0.6V) to −1.0VOutput Current 10 mAStorage Temperature −65˚C to +150˚

Página 3 - Figure 1

Typical Performance Characteristics To generate these curves the LM50 was mounted to a printedcircuit board as shown inFigure 2.Thermal ResistanceJunc

Página 4 - 2.0 Capacitive Loads

Typical Performance Characteristics To generate these curves the LM50 was mounted to a printedcircuit board as shown inFigure 2. (Continued)1.0 Mounti

Página 5 - 3.0 Typical Applications

2.0 Capacitive Loads (Continued)pass the power supply voltage, as shown inFigure 4.Inanoisy environment it may be necessary to add a capacitorfrom the

Página 6 - DS012030-16

3.0 Typical Applications (Continued)DS012030-14FIGURE 8. Temperature To Digital Converter (Parallel TRI-STATE®Outputs forStandard Data Bus to µP Inter

Página 7 - NS Package Number MA03B

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

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Rainbow-electronics LM50 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics LM50. Rainbow Electronics LM50 User Manual Manual do Utilizador

Resumo do Conteúdo

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