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參數資料
| 型號： | L4620 |
| 廠商： | 意法半導體 |
| 英文描述： | LIQUID LEVEL ALARM |
| 中文描述： | 液位報警 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 61K |
| 代理商： | L4620 |
December 1999
L4620
LIQUID LEVEL ALARM
.
DRIVESDIRECTLY 300 mA ALARMLOAD
.
PROGRAMMABLEINPUTPOLARITYTO
ACTIVATETHEOUTPUT STAGE
.
PROGRAMMABLEDELAYTIME
.
PROGRAMMABLEOUTPUT DUTY CYCLE
.
OUTPUT SHORT CIRCUIT PROTECTION
.
OVERVOLTAGEAND THERMAL
PROTECTION
DESCRIPTION
The L4620is an integratedcircuit, designedfor the
liquid level control in automotive applications. The
liquid level is indicated by an attenuationbetween
transmitted andreceived signal across a sensor tip
in thelquid. If the attenuationexceedesan internal
threshold- sensortipoutsidetheliquidorliquidtem-
peraturehigherthana determinedvalue- asquare-
wave alarm output indicates an unsufficient liquid
condition.Iftheliquidlevelisrestoredbeforetheend
of adelaytime the alarmis not activated.
Throughtwopinsitispossibletoprogram:thedelay
time to activate the alarm, the duty cycle of the
output squarewave,the polarity ofthe input thre-
sholdof thesensorfor alarm activation.
TheabovefeaturesmaketheL4620particularlyver-
satilefor many applicationsand give the possibility
to use varioussensortypes.
Internal circuits prevent spurious indications from
the liquid sensor and a latch keeps the alarm acti-
vateduntilthesupplyvoltageisswitchedoff.Thede-
viceincludesthermalshutdownprotections.
Minidip
ORDERING NUMBER :
L4620
BLOCK DIAGRAM
1/9
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