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參數(shù)資料
| 型號： | L9704 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | OCTAL SUPPLY CONTACT MONITORING CIRCUIT |
| 中文描述： | 八路電源監(jiān)控電路聯(lián)系 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 171K |
| 代理商： | L9704 |
APPLICATION CIRCUIT DIAGRAM
Figure 1 :
Typical applicationdiagram forthe L9704circuit. The current flowing in the arrow direction is as-
sumed positive. The external capacitors C
IN
andC
OUT
representthe totalwiring capacitance at
the correspondingpins.
FUNCTIONAL DESCRIPTION
TheL9704circuitmonitorsthestatusofthecontacts
connectedtobatteryandthroughtheseriesexternal
resistors R
IN
to the contact sense input pins. The
contacts equivalent circuit is supposed to be as
shown in fig. 2.
The L9704 circuit compares the input current with
the current through the internalreference resistor.
Thedeviceisdesignedtoworkwithanexternalinput
seriesresistorofR
IN1-8
=1k
.Withthisinputresistor
the contactcurrent,when thecontactis closedand
the deviceactivated (EN = LOW) is
V
BAT
+
V
BAT
– 2V
I
IN
=
1K
Forthis calculationthelimit valueof the V
IN
(satura-
tionvoltageof2V)wasconsideredsothatthelowest
limit value of I
IN
is calculated in (1).
Thefunctionof thecircuitcan bedemonstratedwith
the transfer characteristics, showing the output
(1)
status as a functionof the input resistor R
I
, shown
in figure3.The inputresistoris asumof theR
IN
and
the contactresistanceR
CON
orR
COFF
, fortheclosed
contact:
R
I
=R
IN
+ R
CON
,
and forthe open contact:
R
I
= R
IN
+ R
COFF
.
The outputgoesHIGHwhentheinput resistancein-
creasesabove6.5k
(typicalvalue)andgoesLOW,
when the input resistance decreasesbelow 4.8K
(typical value). The limit values of R
I
= 1.1K
for
LOW andR
I
=29k
forHIGH implies that acontact
withR
CON
=100
(atI
IN
=10mA)will be recognized
as ON= LOWand acontactwith R
COFF
=28k
will
be recognized as OFF = HIGH. These limits are
validwithin thesupplyvoltagerange 5V
≤
V
s
≤
16V,
the
battery
voltage
potential
VBAT
≤
0.1V
BAT
andthevariationofthereverse
batteryprotectiondiodeD1voltagefrom0.5Vto1V.
(2)
(3)
difference
of
L9704
4/8
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| L9708 | 功能描述:低壓差穩(wěn)壓器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L970813TR | 功能描述:低壓差穩(wěn)壓器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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