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LM903N

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LM903N 数据手册

February 1995

LM903 Fluid Level Detector

General Description

Features

Flashing or continuous warning indication

The LM903 uses the thermal-resistive probe technique to

measure the level of nonflammable fluids. A low fluid level is

indicated by a warning lamp operating in continuous or

flashing mode. All supervisory requirements to control the

thermal-resistive probe, including short and open circuit

probe detection, are incorporated within the device. The cir-

cuit has possible applications in the detection of hydraulic

fluid, oil level, etc., and may be used with partially conduct-

ing fluids.

Warning threshold externally adjustable

Control circuitry for thermal-resistive probe

Switch on reset and delay to avoid transients

600 mA flashing lamp drive capability

Short and open circuit probe detection

70V transient protection on supply and control input

7V–18V supply range

Internally regulated supply

40 C to 80 C operation

Connection Diagram

Dual-In-Line Package

TL/H/5699–1

Order Number LM903N

See NS Package Number N16E

1995 National Semiconductor Corporation

TL/H/5699

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7 8

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