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LM903N Datasheet

  • LM903N

  • Fluid Level Detector

  • 8頁

  • NSC

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LM903 Fluid Level Detector
February 1995
LM903 Fluid Level Detector
General Description
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
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Flashing or continuous warning indication
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鈥?18V supply range
Internally regulated supply
b
40 C to
a
80 C operation
Connection Diagram
Dual-In-Line Package
TL H 5699 鈥?1
Order Number LM903N
See NS Package Number N16E
C
1995 National Semiconductor Corporation
TL H 5699
RRD-B30M115 Printed in U S A

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