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參數(shù)資料
| 型號(hào)： | L9703 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | OCTAL GROUND CONTACT MONITORING CIRCUIT |
| 中文描述： | 八路地面接觸的監(jiān)控電路 |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大小： | 169K |
| 代理商： | L9703 |
FUNCTIONAL DESCRIPTION
TheL9703circuitmonitorsthestatusofthecontacts
connected to groundand throughthis series exter-
nalresistorsR
IN
tothecontactsenseinputpins.The
contacts equivalent circuit is supposed to be as
shownin fig. 2.
The L9703 circuit compares the input current with
the current through the internal reference resistor.
Thedeviceisdesignedtoworkwithanexternalinput
seriesresistorofR
IN1-8
=1k
.Withthisinputresistor
the contactcurrent, when the contactis closed and
the device activated (EN = LOW) is
V
S
- 2V
I
IN
=1k
For this calculation the limit value of the V
S
to IN
saturationvoltage of 2V was consideredso thatthe
lowest limit value of I
IN
is calculated in (1).
The functionof thecircuit canbedemonstratedwith
the transfer characteristics, showing the output
statusas a functionof the input resistor R
I
, shown
infigure3. Theinputresistoris asum oftheR
IN
and
thecontactresistanceR
CON
orR
COFF
, fortheclosed
contact:
R
I
=R
IN
+ R
CON,
and for theopencontact :
R
I
=R
IN
+ R
COFF
.
(1)
(2)
(3)
TheoutputgoesHIGHwhentheinputresistancein-
creasesabove5.3k
(typicalvalue)andgoesLOW,
when the input resistance decreases below 4k
(typical value). The limit values of R
I
= 1.8K
for
LOWandR
I
=20k
forHIGH implies thata contact
withR
CON
=100
(atI
IN
=10mA)will be recognized
as ON = LOW anda contactwith R
COFF
=19k
will
be recognized as OFF = HIGH. These limits are
valid within the supplyvoltagerange6V
≤
VS
≤
16V
and
the
ground
potential
VGND
= 0,1V.
The internal clamping diodes at the contact moni-
toringinputs,togetherwith theexternalcontactsse-
ries resistors R
IN
, allows the device to withstand
transientsatthecontactconnection.Thecontactse-
ries resistor R
IN
limits the input current at the tran-
sient.
The dynamic behaviour of the circuit is definedby
the times t
do
andt
dTs
. When the contactis open,the
inputcapacitor C
IN
mustbe chargedthroughthe re-
sistor R
IN
. Inthis case the total delaytime may also
be influencedby the timeconstantR
IN
C
IN
.
Thedelaytimet
dTs
,whendisablingthedevice,isde-
finedonlybythe internalcircuitry. In bothcases,an
external output capacitance less than 50pF is as-
sumed, the internal output capacitances of the
three-statebuffers areless than5pF.
difference
of
Figure 2 :
The Contact SenseInputConnectionwith the ContactEquivalent Circuit.
L9703
5/9
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| L9703D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:OCTAL GROUND CONTACT MONITORING CIRCUIT |
| L9704 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:OCTAL SUPPLY CONTACT MONITORING CIRCUIT |
| L9704D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:OCTAL SUPPLY CONTACT MONITORING CIRCUIT |
| L9705 | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Double Quad Interfac RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L9705D | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Double Quad Interfac RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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