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參數資料
| 型號： | LM903 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Fluid Level Detector |
| 中文描述： | 液位檢測器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 148K |
| 代理商： | LM903 |
TL/H/5699
L
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
Flashing or continuous warning indication
Y
Warning threshold externally adjustable
Y
Control circuitry for thermal-resistive probe
Y
Switch on reset and delay to avoid transients
Y
600 mA flashing lamp drive capability
Y
Short and open circuit probe detection
Y
70V transient protection on supply and control input
Y
7V–18V supply range
Y
Internally regulated supply
Y
b
40
§
C to
a
80
§
C operation
Connection Diagram
Dual-In-Line Package
TL/H/5699–1
Order Number LM903N
See NS Package Number N16E
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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