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L9704
OCTAL SUPPLY CONTACT MONITORING CIRCUIT
L9704OCTAL SUPPLY CONTACT MONITORING CIRCUIT
.OPERATING DC SUPPLY VOLTAGE RANGE TO 25V .SUPPLYOVERVOLTAGE PULSE UP TO 40V.VERY LOW STANDBY QUIESCENT CUR-
RENT 0.2mA.INTERNAL CLAMPING DIODES AT CONTACT
INPUTS TOVS AND GND.INPUT PULSE CURRENT CAPABILITY UP TO 50mA,– 75mA.NOMINAL CONTACT CURRENTS OF 10mA
DEFINED BY EXTERNAL CONTACT SERIES
RESISTORS RIN1-8.CONTACT STATUS MONITORING BY COM-
PARING THE RESISTANCE AT CONTACT
SENSEINPUTS WITHTHEINTERNAL REFER-
ENCE RESISTOR VALUE.HIGH IMMUNITY DUE TO RESISTANCE COM-
PARISON WITH HYSTERESIS
ORDERING NUMBERS: L9704 (DIP–20)
L9704D (SO–20L)
DIP–20
SO–20L
DESCRIPTIONThe L9704isa bipolar monolithic integrated circuit
for monitoring the statusofupto eight contactscon-
nectedto the power supply (battery). containseight contact sense inputsand eight mi-
crocomputercompatible three-state outputs.
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Test Conditions Unit Transient Supply Voltage(t≤ 1s) +40 V
VCC Logic Supply Voltage 7 V
IINDC InputDC Current ±40 mA
IINP InputDC Pulse
(test pulse specification:0
-75 Output Current Internally Limited
VEN Enable Input Voltage VCC +0.3
-0.3 Power Dissipationat Tamb =80°C
DIP20
SO20
Tstg,TJ Storage and Junction Temperature Range -55to 150 °C
PIN CONNECTION (top view)
THERMAL DATA
Symbol Parameter DIP20 SO20 Unit
Rth j-amb Thermal Resistance Junctionto Ambient MAX. 80 165 °C/W
L9704
ELECTRICAL CHARACTERISTICS (5V≤ VS≤ 25V; -40°C ≤ Tj≤ 125°C; 4.75V≤ VCC≤ 5.25V unlessotherwise specified; the currents flowingin the arrow direction are assumed positive as markedin theapplication circuit diagram, fig. 1).
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VENL Enable Input Voltage LOW
(device activated)
0.8 V
VENH Enable Input Voltage HIGH 2.4 V
VENhyst Enable Input Hysteresis 200 300 800 mV
IEN Enable Input Current 2.4V< VEN VOUTH Output Voltage HIGH 0< IOUT< 100μA 4.0 VCC -0.1 VCC V
VOUTL Output Voltage LOW IOUT= -1mA 0.05 0.2 0.4 V
IOUTTS Output TRISTATE Current 0< VOUT VIN Input Voltage (device active) EN= LOW
RIN =1kΩ
0.4 1.5 2 V
VIN Input Voltage During Clamping
(device disabled)= HIGH
IIN= 30mA
IIN= -30mA +0.3 +1+2
IOUT Output Current OUT= HIGH
VOUT =0
2mA
IOUT Output Current OUT= LOW
VOUT= 5.5V
-20 mA
RIL Input Resistor (note1)
LOW Threshold1.1 4.8 KΩ
RIH Input Resistor (note1)
HIGH Threshold
6.5 29 KΩ
Input Resistor
Threshold Ratio (note1)
0.65 0.75 0.85
IQC Quiescent Current EN= HIGH (tENH≥ 80μs)-40°C≤Tj≤ 100°C
All Inputs Open
0.12 0.16 mA
IQS 0.04 mA
SIIN2) Input Leakage Current All Inputs Closed VBAT≤ VD1 0.24 mA
IQC
IQS
Quiescent Current EN= LOW 13
tdo Delay Time/Output
(EN LOWto output data ready)
COUT≤ 50pF 15
+3RINCIN
tdTS Delay Time/Tristate
(EN HIGHto output TRISTATE)
COUT≤ 50pF 10 μs
Notes: The input resistor threshold valueisa resistor value fromthe IN–pinto batteryat whichthe corresponding output changes
itsstatus(see fig.3) SIINisthe sumofthe input currents SIIN=∑=1
IIN1.
RIL
RIH
L9704
APPLICATION CIRCUIT DIAGRAM
Figure1: Typical application diagram forthe L9704 circuit. The current flowingin the arrow directionis as-
sumed positive. The external capacitors CIN and COUT representthe total wiring capacitanceat
the corresponding pins.
FUNCTIONAL DESCRIPTION
TheL9704circuit monitors thestatusof thecontacts
connectedto batteryand through theseries external
resistors RINto the contact sense input pins. The
contacts equivalent circuitis supposedto be as
shownin fig.2.
The L9704 circuit compares the input current with
the current through the internalreference resistor.
The device isdesignedto work withan externalinput
seriesresistorofRIN1-8 =1kΩ. With thisinputresistor
the contact current, when thecontactis closed and
the device activated (EN= LOW)is
VBAT+ ΔVBAT –2VIIN= 1KΩ (1)
For this calculation thelimit valueof the VIN (satura-
tion voltageof 2V) wasconsideredsothat thelowest
limit valueofIINis calculatedin (1).
statusasa functionof the input resistor RI, shown figure3. The inputresistorisa sumof theRIN and
the contactresistanceRCONor RCOFF,for theclosed
contact: =RIN +RCON, (2)
andfor the open contact: =RIN +RCOFF. (3)
The outputgoes HIGH whenthe input resistancein-
creases above6.5kΩ (typicalvalue)andgoesLOW,
when the input resistance decreasesbelow 4.8KΩ
(typical value). The limit valuesofRI= 1.1KΩ for
LOW andRI= 29kΩfor HIGH implies thata contact
with RCON =100Ω (atIIN= 10mA) willbe recognized ON= LOWanda contact with RCOFF =28kΩ will recognizedas OFF= HIGH. These limits are
validwithin thesupply voltage range5V≤Vs≤ 16V,
the battery voltage potential difference of andthevariation ofthereverse
L9704
The internalclamping diodesat thecontactmonitor-
ing inputs, together with the external contact series
resistors RIN, allows the deviceto withstand tran-
sients atthe contactconnection.The contact series
resistorRIN limits the input currentat the transient.
The dynamic behaviourof the circuitis definedby
the timestdo andtdTS. When the contact becomes
open, the input capacitor CIN must be charged
through the resistor RIN.In this case the total delay
timemay alsobe influencedbythetime constantRIN
CIN. The delay time tdTS, when disabling the device definedonly bytheinternalcircuitry. Inbothcases, externaloutputcapacitanceless than50pFis as-
sumed, the internal output capacitancesof the
three-statebuffers are less than 5pF.
Figure2: The Contact SenseInput Connection with the Contact Equivalent Circuit.
Figure3: The Output Voltageasa Functionof the Input Resistanceat the Corresponding Contact Sense
Input.
L9704
SO20 PACKAGE MECHANICAL DATA
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 2.65 0.104 0.1 0.3 0.004 0.012 2.45 0.096 0.35 0.49 0.014 0.019 0.23 0.32 0.009 0.013 0.5 0.020 45 (typ.) 12.6 13.0 0.496 0.512 10 10.65 0.394 0.419 1.27 0.050 11.43 0.450 7.4 7.6 0.291 0.299 0.5 1.27 0.020 0.050 0.75 0.030 8 (max.)
L9704
