L3000 ,SUBSCRIBER LINE INTERFACE KITapplications:Battery feedC.O.(CentralOffice),DLC(Digital LoopCarrier)and-Ringing-high range PABX (P ..
L3000S ,SUBSCRIBER LINE INTERFACE KITL3000SL3030SUBSCRIBER LINE INTERFACE KITPRELIMINARY DATA. PROGRAMMABLE DC FEEDING RESIS-TAN-CE AND ..
L3092N , SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS
L3100B ,OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINEFEATURESUNIDIRECTIONAL FUNCTIONPROGRAMMABLE BREAKDOWN VOLTAGEUP TO 265 VPROGRAMMABLE CURRENT LIMITA ..
L3100B1 ,OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINEL3100BL3100B1Application Specific DiscretesOVERVOLTAGE AND OVERCURRENTA.S.D.PROTECTION FOR TELECO ..
L3100B1 ,OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINEFEATURESUNIDIRECTIONAL FUNCTIONPROGRAMMABLE BREAKDOWN VOLTAGEUP TO 265 VPROGRAMMABLE CURRENT LIMITA ..
LB1840 ,Low-voltage/Low-saturation Bidirectional Variable Constant-voltage Motor DriverElectrical Characteristics at Ta = 25°C, V =6VCCParameter Symbol Conditions min typ max UnitSupply ..
LB1840 ,Low-voltage/Low-saturation Bidirectional Variable Constant-voltage Motor DriverAbsolute Maximum RatingsatTa=25°CParameter Symbol Conditions Ratings UnitMaximum supply voltage V m ..
LB1840M ,Low-voltage/Low-saturation Bidirectional Variable Constant-voltage Motor DriverElectrical Characteristics at Ta = 25°C, V =6VCCParameter Symbol Conditions min typ max UnitSupply ..
LB1841 ,Low-Saturation Current-Controlled Forward/Reverse Motor DriverAbsolute Maximum Ratings at Ta = 25
L3000-L3000S
SUBSCRIBER LINE INTERFACE KIT
L3000S
L3030June 1997
SUBSCRIBER LINE INTERFACE KIT
PRELIMINARY DATA. PROGRAMMABLE DC FEEDING RESIS-TAN-
CEAND LIMITINGCURRENT (fourvalues avai-
lable). THREE OPERATING MODES:
STAND-BY, CONVERSATION, RINGING. NORMAL/BOOSTBATTERY,DIRECT/REVER- POLARITY. SIGNALLINGFUNCTION (off-hook/GND-key). FILTERED OFF-HOOK DETECTION IN
STAND-BY (10ms). QUICK OFF-HOOK DETECTIONIN CONVER-
SATION(< 1ms) FOR LOW DIAL PULSE DE-
TECTION DISTORTION. HYBRID FUNCTION. RINGING GENERATION WITH QUASI ZERO
OUTPUT IMPEDANCE, ZERO CROSSING IN-
JECTION (no ext. relay needed) AND RING
TRIP DETECTION. AUTOMATIC RINGING STOP WHEN OFF-
HOOKIS DETECTED. PARALLEL AND SERIAL DIGITAL INTERFA-
CES. TELETAXESIGNALINJECTION(2VRMS/5VRMS). LOW NUMBER OF EXTERNAL COMPO-
NENTS. GOOD REJECTION OF THE NOISE ON BAT-
TERY VOLTAGE (20dBat 10Hz and 35dBat
1kHz). POSSIBILITY TO WORK ALSO WITH HIGH
COMMON MODE CURRENTS. INTEGRATEDTHERMAL PROTECTIONWITH
THERMAL OVERLOADINDICATION. SURFACE MOUNT PACKAGE
(PLCC44+ PowerSO-20)
DESCRIPTION
PLCC44 FLEXIWATT15The ST SLIC KIT (L3000S/L3030)isa setof solid
state devices designedto integratemainof the fun-
ctions neededto interfacea telephone line.It con-
sistsof2 integrated devices: the L3000S line
interfacecircuit and the L3030control unit.
Thiskit performsthe main featuresof the BORSHT
functions: Battery feed- Ringing- Signalling- Hybrid
Additionalfunctions, suchas batteryreversal, extra
batteryuse, lineovervoltagesensing andmetering-
pulse injection are also featured; most external
characteristics,as ACandDCimpedances,arepro-
grammablewith externalcomponents.The SLICin-
jects ringingin balancedmode andfor that,as well for the operationin battery boosted,a positive
batteryvoltage shallbe availableon the subscriber
card.As the rightringing signal amplification bothin
voltage andin currentis providedby SLIC, thering
signalgeneratorshall onlyprovidea lowlevelsignal
(0.285Vrms).
Thiskitis fabricatedusinga 140VBipolar technolo-for L3000Sanda 12VBipolarI2L technologyfor
L3030.
L3030is available PLCC44 and L3000Sin both
FLEXIWATT15andPowerSO-20for surfacemount
application.
Thiskitis suitableforall the following applications:
C.O.(CentralOffice),DLC(DigitalLoopCarrier)and
high range PABX (Private Automatic Branch Ex-
change).
PowerSO20
slug-up slug-down
ORDERING NUMBERS:L3030 (PLCC44)
L3000SX-VM (FLEXIWATT15)
L3000SX (PowerSO20 slug-up)
L3000SX-77 (PowerSO20 slug-down)
1/29
PIN CONNECTIONS (top view)
PLCC44 FLEXIWATT15VB-
VBIM AGND
TIP
MNT
BGND
VB+
VDD
VIN
N.C.
VB- 10 VB-
D97TL290
REF
N.C.
RING
VB-
PowerSO-20 (slug-down)VB-
VBIM
VIN
VDD
BGND
MNT
VB+
TIP
N.C. RING
N.C.
REF
AGND
VB-10
VB- VB-
D94TL125
PowerSO-20 (slug-up)
L3000S- L30302/29
PIN DESCRIPTION (L3000S)
FLEX.
PSO Name Description 3 TIP A line termination output with current capabilityupto 100mA(Iais the current sourced
from this pin). 4 MNT Positive Supply Voltage Monitor VB+ Positive Battery Supply Voltage 6 BGND Battery ground relativeto the VB+ andthe VB– supply voltages.is also the reference groundfor TIP and RING signals. VDD Positive Power Supply+5V 8 VIN 2 wire unbalanced voltage input. 9 VBIM Output voltage without current capability, with the following functions: givean imageof the total battery voltage scaledby40to the low voltage part. filterbyan external capacitor the noiseon VB–.
81,10
11,20
VB– Negative Battery Supply Voltage 12 AGND Analog Ground.All input signals andthe VDD supply voltage mustbe referredto this pin. 13 REF Voltage reference output with very low temperature coefficient. The connected resistor
sets internal circuit bias current. 14 C1 Digital signal input(3 levels) that defines device status withpin12. 15 C2 Digital signal input(3 levels) that defines device status withpin11. 16 IT High precision scaled transversal line current signal.=Ia+Ib
100 17 IL Scaled longitudinal line current signal.=Ib−Ia
100 19 RING B line termination output with current capabilityupto 100mA(Ibis the current sunk into
this pin). 2,18 N.C. Not connected
Notes:1) Unless otherwise specifiedallthe diagramsinthis datasheet referstothe FLEXIWATT15pin connection.
All informations relativetothe PowerSO-20 package option shouldbe consideredas advanced informationona new product
nowin developmentor undergoing evaluation. Detailsare subjectto change without notice.
L3000S- L30303/29
PIN DESCRIPTION (L3030)
Pin Symbol Function TST Thispinis connected internallyfor test purpose.It should notbe usedasatie pointfor
external components. REF Bias Set AGND Analog Ground VSS –5V VDD +5V N.C. Not connected. CZS AC Feedback Input ACF AC Line Impedance Synthesis ZAC AC Impedance Adjustement
TST These pins are connected internallyfor test purpose.It should notbe usedasatie point
for external components. VOUT Two wire unbalanced output. CM Capacitor Multiplier Input RC DC Feedback Input IT Transversal Line Current RDC DC Feeding System EIA Read/write Command NCS Chip Select Command DIO Data Input/output DCKL Clock Signal DGND Digital Ground N.C. Not connected. N.C. Not connected. N.C. Not connected. CI Input/output Changing Command C1 State Control Signal1 C2 State Control Signal2 N.C. Not connected. N.C. Not connected. IL Longitudinal Line Current CRTS Ringtrip Det.& TTX Shaping TTXIN Teletaxe Signal Input RGTTX TTX Filter Level Compensation TTXF TTX Filter Input ZB Balancing Network
TST These pins are connected internallyfor test purpose.It should notbe usedasatie point
for external components. TX 4W Sending Output RX/RG 4W Receiving and Ring Input VBIM Battery Image Input TST These pins are connected internallyfor test purpose.It should notbe usedasatie point
for external components.
L3000S- L30304/29
L3000S BLOCK DIAGRAM
L3030 BLOCK DIAGRAM
L3000S- L30305/29
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value UnitVb– Negative Battery Voltage –80 V
Vb+ Positive Battery Voltage 80 V
|Vb–|+ |Vb+| Total Battery Voltage 140 V
Vdd Positive Supply Voltage +6 V
Vss Negative Supply Voltage –6 V
Vagnd –Vbgnd Max. Voltage between Analog Ground and Battery Ground 5 V Max. Junction Temperature + 150 °C
Tstg Storage Temperature –55to+ 150 °C
OPERATING RANGE
Symbol Parameter Min. Typ. Max. UnitToper Operating Temperature Range 0 70 °C
Vb– Negative Battery Voltage –70 –48 –24 V
Vb+ Positive Battery Voltage 0 +72 +75 V
Vb–+ Vb+ Total Battery Voltage 120 130 V
Vdd Positive Supply Voltage + 4.5 +5.5 V
Vss Negative Supply Voltage – 5.5 – 4.5 V
Imax Total Line Current(IL+IT) 85 mA
THERMAL DATA
Symbol Parameter Value UnitL3000S HIGH VOLTAGE
Flexiwatt PWSO20Rth j-case Thermal Resistance Junctionto Case Max.4 Typ.2 °C/W
Rth j-amb Thermal Resistance Junctionto Ambient Max.50 Max.60 °C/W
L3030 LOW VOLTAGE
Rth j-amb Max. Resistance Junctionto Ambient 80 °C/W
FUNCTIONAL DESCRIPTION
L3000S- High Voltage CircuitTheL3000Slineinterfaceprovidesa batteryfeeding
fortelephonelinesandringing injection.The ICcon-
tainsa statedecoderthat underexternalcontrolcan
force the following operational modes: stand-by,
conversation and ringing. addition Power down mode canbe forced con-
nectingthe bias current resistorto VDDor leavingit
open.
Twopins,IL andIT, carryoutthe informationconcer-
ning line statuswhich isdetectedby sensing theline
current into the output stage.
The L3000Samplifies both the AC and DC signals
enteringat pin6 (VIN)bya factorequalto 40.
Separate groundsare provided: Analog groundasa referencefor analog signals Battery groundasa referencefor the output sta-
ges
The two groundshouldbe shortedtogetherata low
impedancepoint.
L3030- Control UnitThe L3030low voltagecontrol unit controls L3000S
line interface module,giving theproperinformation set line feed characteristic,to inject ringing and
TTXsignal and synthetizesthelineandbalance im-
pedances.Anon chip digital interfaceallowsa mi-
croprocessorto controlall the operations. L3030
definesworking statesof line interface and alsoin-
forms the card controllerabout line status.
L3000S- Working States orderto carry out the different possible opera-
tions, theL3000Shasseveral different workingsta-
tes.Each stateisdefinedbythevoltagerespectively
appliedby pins27 and28of L3030to the pins11
and12of L3000S.
Three different voltage levels(–3,0,+3) are avai-
lableat each connection,so defining nine possible
L3000S- L30306/29
Table1.
Pin28of L3030/ Pin12of L3000S (C2) 0 –3
Pin27of L3030
Pin 11of L3000S3 Stand-by Conversationin Normal
Battery Direct Polarity
Conversationin Normal
Battery Reverse Polar Not allowed. Conversationin Boost
Battery Direct Polarity
Conversationin Boost
Battery Reverse Polar3 Not allowed. Ringing with Direct
Polarity
Not allowed.
statesas listedin Table.1.
Appropriate combinationsof two pins define the
three modesof the ST SLIC, that are: Stand-by(SBY) Conversation (CVS), Normal and Reverse pola-
rity Ringing (RING)
d)Boost Battery(BB), Normal and Reversepolarity fifth status, Power down (PD), canbe set discon-
nectingthebiasresistor(RH) frompin10 ofL3000S meansof anexternal transistor.
The main difference between Stand-by and Power
downis thatin SBY the power consumptionon the
voltage battery VB–(– 48V)is reduced but the
L3000S DC feedingand monitoring circuits are still
active.In PD the power consumptionon VB-is re-
ducedto zero, and the L3000Sis completely swit-
ched off.
TheSBYstatus shouldbe usedwhenthe telephone
isin On hookand PD statusonlyin emergencycon-
dition whenitis mandatoryto cut any possible dis-
sipationbutno operation are requested.
OPERATING MODES
Stand-by (SBY) Mode this mode, the bias currentsof both L3000Sand
L3030arereducedasonlysomepartsof thetwocir-
cuits are completely active, control interface and
current sensors among them. The current supplied
tothe lineis limitedat 7mA,and the slopeof theDC
characteristic correspondsto:=2x (RFS+ 2RP)
The Linevoltage inon Hookconditionisjustthe bat-
teryvoltage minus thevoltagedrop(approx.15V)of
the outputstage amplifiers (see Fig.1).
Figure1: DC Characteristicsin Stand-byMode.
L3000S- L30307/29
The AC characteristicis just the resistanceof the
two serial resistors RP. Stand-bymodethe batterypolarityisjust indirect
condition,thatistheTIP wire morepositivethanthe
RING one; boost batteryis not achievable. There
are two possible line conditions where the SLICis
expectedtobein stand-bymode: ON-HOOK (Iline< 5mA). Normal on-hook
condition. OFF-HOOK (Iline> 7mA).Handsetis unhooked,
the SLICis waiting for commandto activate
conversation.
Whenthe SLICisin stand-bymode, the powerdis-
sipationof L3000Sdoes not exceed 120mW (from
-48V) eventually increasedofa certain amountif
some currentis flowing into the line.
The power dissipationof L3030in thesame condi-
tion,is typically 120mW.
The Stand-byModeis setwhen the bytesentto the
L3030 Serial Digital Interface has the first two bits
(BIT0R and BIT1R) equalto ”0”.
Settingto0all the8 bitsof thecommandsentto the
digital interfaceof L3030, the bias currentsof both
L3000S and L3030 are reduced and only some
partsof the two circuits are active similarlyto the
stand-by mode;in this situation, named power-
down denial, the line sensors are disabled
(ON/OFF-HOOK line conditions cannotbe recogni-
zed)and the currentsuppliedto the lineis limitedat
0.25mA.
Conversation(CVS)or Active ModeInconversationmodeitispossibletoselectbetween
two differentDCCharacteristicsby the BIT5Rofthe
Serial Interface. Normal Battery (NB) Boost Battery (BB)
Itis also possibleto select(BIT4R)thepolarityofthe line voltage and (BIT6R-BIT7R) oneof the four
valuesof limiting current (25mAor 30mAor 45mA 70mA).
Battery reverse can take place either beforeor du-
ring conversation.faras the DC characteristicin Normal Batteryis
concerned, three different feeding conditions are
present: current limiting region; the DC impedanceof the
SLICis very high(>20 Kohm)and therefore the
systemworkslikeacurrentgenerator,thecurrent
value being set through the digital interface
(25/30/45/70mA). standard feeding system region ; the
characteristicis equaltoa– 48V(– 60V) battery
(note1), inserieswith tworesistors,whosevalue set by external components (see external
componentlistof L3030). low impedance region; the battery valueis
reducedto 33V (45V)and the serialresistanceis
reducedto thevalue specifiedin standby mode,
thatis:2x (RFS+ 2RP)
Switchingbetweenthe threeregionis automaticwi-
thout discontinuity, and dependson the loop resi-
stance.Fig.2 shows theDCcharacteristicin normal
batterycondition.
Whentheboostbatteryconditionisactivatedthelow
impedanceregion can neverbe reachedby the sy-
Figure2: DC Characteristic (n.b.) ILIM= 25/30/45/70mA.
Note: 1. This value ofvoltage battery, namedapparent battery,is fixedinternallyby thecontrolunitandis independentof theactual battery
value.So, thevoltage dropin thelowimpedance region is15V.Itis alsopossible toincreaseupto 25Vthisvaluesetting BIT3Rto1.
L3000S- L30308/29
stem;in this case the internal dropout voltageis
equalto 30V.
Fig.3 shows the DC characteristicin boost battery
condition.
Inconversationmode,onrequestof controlproces-
sor, whateverconditionis set (normalor boost bat-
tery, director reverse polarity), you can inject the
12kHz(or16kHz)signal (permanentlyappliedatthe
pin33 with 950mVrmstyp. amplitude),as metering
pulses.A patentedautomatic control system adjust
the levelof the metering signal, across the line,to
2Vrms setting BIT3=0, orto 5Vrms setting BIT3=; this, regardlessof the lineimpedance. Moreover
the metering signalis rampedat the beginningand theendof eachpulseto preventundesirableclic-
king noise; the slopeis determinedby the valueof
CINT (see the external componentlistof L3030).
The SLIC also provides,in the transmit direction
(fromlineto 4-wireside),an amplifiertoinsert anex-
ternalnotchfilter (series resonator)for suppressing
the 12/16kHz residualsignal.
Fig.4 showsa suggestednotch Filterconfiguration.
The meteringpulsescanbe injected witha DC line
current equalto zero (ON-HOOK Operation). teletaxis not used the notchfiltercanbe replaceda 1KΩ resistor.
InconversationmodetheACimpedanceatthelineter-
minals,ZML,issynthetizedbytheexternalcomponents
ZACandRP,accordingto thefollowingformula:
ZML= ZAC+ (RP1+ RP2)
Dependingon the characteristicof the ZACnetwork,
ZMLcanbe eithera pureresistanceoracomplex im-
pedance,soallowingST SLICtomeetdifferentstand-
ards as faras the return lossis concerned. The
capacitorCCOMP guaranteesstabilitytothe system.
The two-to-four wire conversionis achievedby me-
ansof aWheatstone bridge configuration,the sides which being: the line impedance (Zline), the SLIC impedanceat line terminals (ZML), thenetworkZAconnectedbetweenpin36and41 L3030(see externalcomponentlistof L3030), the network ZB between pin36 and ground that
shall copy the line impedance.
Fora perfectbalancing,the followingequationshall
beverified:= ZML
Zlineis importantto underline that ZA and ZB are not
obligedtobe equalto ZML andto Zline, but they
both maybe multipliedbya factor (upto ten)soal-
lowing useof smaller capacitors.
Inconversation,theL3000Sdissipatesabout250mW
foritsownoperation;thedissipationdependingonthe
current suppliedto theline shallbe added.
Thefig5 andfig6showtheDCcharacteristicfortwo
different Feeding resistance.x 200 Ohm and2x 400 respectively.= 1√LxC=R2x R4xR5 xC2
Figure4: ExternalTeletaxe Filter.
Figure3: DC Characteristic (b.b.)
ILIM= 25/30/45/70mA.
L3000S- L30309/29
Figure5: DC Characteristicfor2x 200ohm Feeding System.
Figure6: DC Characteristicfor2x 400 ohm Feeding System.
Figure7: Line Current Versus Loop Resistance,RFS= 200Ω,RP =30Ω,VB–= –48V.
L3000S- L303010/29
Ringing ModeWhenringingis selected(BIT2R= 1,BIT0R= 0),the
control unit L3030 presets the L3000Sto operate
between– 48V(– 60V)and+ 72V(+ 60V) battery.
Then,settingBIT1 =1,a lowlevelsignal(0.285Vrms
with frequencyrange 16-66Hz) appliedto pin 41,is
amplified and injectedin balancedmodeto the line
throughL3000Switha superimposedDC voltageof
24V. The impedanceto the lineis givenby the two
external resistors and the 24V DC polarity can only
bedirect.
Thefirstandthelastringingcycles aresynchronized L3030so that ringing always starts and stopsat
zero crossing. Ring trip detectionis performed au-
tonomouslybytheSLIC,withoutanyparticularcom-
mand, usinga patentedsystem; when handsetis
lifted, SLIC suspends the ringing signal just remai-
ning intheringingmode.Inthiscondition,thecontrol
unit L3030 checks that the loopis closedfora time
equalto two periodsof the ringingsignal;if the clo-
sureis confirmed,a flag (BIT0T=1)is set and the
SLICwaits the new command from the controlpro-
cessor.Whereas the loop closureis not confirmed,
theringingsignalis newlyappliedto theline,without
setting BIT0T.
DIGITAL INTERFACE
Functional DescriptionThe L3030 states and functions are controlledby
centralprocessorthrough five wires defininga digi-
tal interface.Itispossibleto selecttheinterfacewor-
king mode between SERIALor PARALLEL(pin33
tiedtoa voltagebetween4 and 5V).
SerialModeThe five wiresof the digitalinterface havethe follo-
wing functions: clock (DCLK), enteringat pin21 data in/dataout (DIO), exchangedat pin20 input/outputselect (EIA), enteringat pin18 chip select (NCS), enteringat pin19 changeNCS frominto out (CI), enteringat pin26
(note1)
The maximum clock frequencyis 600Khz.
When EIAsignalislow dataare transferredfromthe
card controller into I/O registersof the L3030 selec-
tedby NCS signal tiedat low level; then data are
latched forexecution.In this phasea complete 8bit
wordis loaded intointernalregisterand consequen-
tly NCS signal must remain low for the correspon-
ding8 clock pulses (DCLK). The EIA signal must
remainat lowlevelatleastfor thetimein whichNCS
signal remain low. The deviceload datain inputre-
gister during the positive edgeof clock signal
(DCLK) and store thecontentsof theregisteron the
positive edgeof NCS signal.
When EIA signalis high data are transferred from
the L3030 selectedby NCS tiedto low levelto the
card controller. The L3030 statusis describedby
five bits containedin the output register; the NCS
signalcan remainlowforfiveorlessclockpulsesde-
pendingif the card controller wantto read the com-
plete L3030 statusor onlya partofit.
Fig.8,9 showthe completewrite and readoperation
timing. Table 1shows themeaningof eachbitofan
I/O data.
L3000S- L303011/29
Table1: Serial Mode.
Meaning Value
Datain (note2)
BIT0R= Impedance (note3) 0- Stand-by/ringing- Conversation
BIT1R= TTX& Ring Timing (note4) 0- Timingoff- Timingon
BIT2R= Ring (note5) 0- TTX Signal Injection- Ring Signal Injection
BIT3R= TTX Level 0- Low Amplitude (2VRMS)- High Amplitude (5VRMS)
BIT4R= Battery Polarity 0- Normal Polarity- Reverse Polarity
BIT5R= Extra Feeding 0- Normal Battery- Boosted Battery
BIT6R
BIT7R
Current
Limiting
25mA
30mA
45mA
70mA
Data Out (note6)
BIT0T= Line Supervision 0-On Hook-Off Hook
BIT1T= Ground Key 1- Long. Line Current< 17mA- Long. Line Current> 17mA
BIT2T= Internal Line Current Limiter (note7) 0-OffOn
BIT3T= Line Voltage 0- Normal- Minusof Half Battery
BIT4T= Thermal Overload (note8) 1-OffOn
Notes:1. WhenCI signalis tiedtolow level, NCS signalis the chip select input; withCI signalat high level,the NCS signal
becomesan output that carryoutthe logical sumofthe following bits: BIT0T, BIT1T. The descriptionofthe commandsis referredtothe system L3030+ LINE INTERFACE module.Toset SBY mode withIlim= 7mA: BIT0R=0 andat least oneofthe two last bits (BIT6R; BIT7R) mustbesetto1. TTX and RING signals are injected intothe line interface module with BIT1Rto ”1”.Toset RING modeat least oneofthe three last bits (BIT5R, BIT6R, BIT7R) mustbesetto1,in addi tion BIT0R
mustbesetto0. The descriptionofthe commandsis referredtothe system L3030+ LINE INTERFACE module. Thebit BIT2Tissetto1 whenthe SLICis operatingin Conversation Mode and intothe limitingcurrent region (short
loop). Thebit BIT4Tissetto1 whenthe junction temperatureof L3000Sis about 140°C.
L3000S- L303012/29
Figure8: Writing Operation Timing (serial mode).
Figure9: ReadingOperation Timing (serial mode).
L3000S- L303013/29
Parallel ModeThis operating modeis enabled connecting pin33
toa voltagein therangefrom4Vto 5V.Thefive wire
have the following functions: power down/feeding (EIA), enteringat pin18 timing (CI), enteringat pin26 ring (DCLK), enteringat pin21 on-hook/off-hook(NCS), outgoingat pin19 ground-key (DIO), outgoingat pin20 this operatingmode the signalsat the inputsare
immediatelyexecuted,without any external clockti-
ming; alltheinternalregistersarebypassed.Thein-
formations sent backon pins19 and 20, displayin
real time the settingof internalcircuits, that means
line status.In the table2 the correspondence bet-
ween the interface wiresin the parallel mode and
equivalentbitin serial modeis pointed out; where
there isn’t this correspondence,the internal setting shown.
Table2: Parallel Mode.
Pin Rif. Meaning (note1) Eq.Bitof Ser. Interf. Value EIA PD/feeding BIT0R 0: High Impedance: Low Impedance CI Timing BIT1R 0: Ring Timing Off: Ring Timing On DCKL Ring BIT2R 0:No Ring: Ring Injection
BIT3R 0: Low Amplitude
BIT4R 0: Normal Polarity
BIT5R 0: Normal Battery
BIT6R 0: Line Curr.= 30mA
BIT7R NCS On-hook/off-hook BIT0T 0: On-hook: Off-hook DIO Ground Key BIT1T 1: Long. Curr.< 17mA: Long. Curr.> 17mA
BIT2T
BIT3T
BIT4T
Note: 1. The descriptionofthe commandsis referredtothe system L3030+ LINEINTERFACEmodule.
DIGITAL INTERFACE ELECTRICAL CHARACTERISTICS(VDD =+ 5V, VSS=– 5V, Tamb.=25oC) (referto PLCC44 package)
Symbol Parameter Test Conditions Min. Typ. Max. UnitSTATIC ELECTRICAL CHARACTERISTICS
Vil Input Voltageat Logical”0” Pins 18, 19, 20, 21, 26 0 0.8 V
Vih Input Voltageat Logical”1” 2.0 5 V
Iil Input Currentat Logical”0” Vil=0V 200 μA
Iih Input Currentat Logical”1” Vih=5V 10 μA
Vol Output Voltageat Logical”0” Pins 19, 20 Iout=– 1mA 0.4 V
Voh Output Voltageat Logical”1” Pins 19, 20 Iout= 1mA 2.4 V
Ilk Tristate Leak. Current Pin20 NCS=”1” 10 μA
L3000S- L303014/29
DIGITAL INTERFACE ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter Test Conditions Min. Typ. Max. UnitDYNAMIC ELECTRICAL CHARACTERISTICS
fclk Clock Frequency 1 600 kHz
Tr,Tf Clock Rise and Fall Time 50 ns
Twh, Twl Clock Impulse Width 750 ns
Tis CIto NCS Setup Time 300 ns
Tec ”0” EIAto DCKL Setup Time 300 ns
Tsc DCKLto NCS Delay(+ edge) 300 ns
Tsd Datain Setup Time 0 ns
Thd Datain Hold Time 800 ns
Tcs NCSto DCKL Hold Time 800 ns
Tca ”0” EIAto DCKL Hold Time 900 ns
Tac ”1” EIAto DCKL Setup Time 400 ns
Tzd Dataoutto”0” NCS Delay 0 600 ns
Tce ”1” EIAto DCKL Hold Time 900 ns
Tdz Dataoutto”1” NCS Delay 500 ns
Tdd Dataoutto DCKL Delay 1500 ns
Tsi ”0”CIto NCS Hold Time 300 ns
OPERATION DESCRIPTION set SLICin operation the following parameters
havetobe defined: the DCfeedingresistanceRFS, definedas there-
sistanceof each sideof the traditionalfeeding sy-
stem (most common values are 200, 400or 500
ohm). the AC impedanceat lineterminals,ZML, towhich
thereturnloss measurement references.It canbe
real (typically 600 ohm)or complex. the equivalent AC impedanceof the line Zline,
when evaluating the trans hybrid loss (2/4 wire
conversion). Itis usuallya compleximpedance. the ringing signal frequencyFr (ST SLIC allows
frequency ranging from16to 66Hz). the metering pulse frequencyFt (two values are
possible: 12kHzor 16kHz). the valueof the two resistors RP1/RP2in series
with the line terminals; main purposeof the a.m.
resistorsisto allow primary protectionto fire. ST
suggest the minimum valueof 50 ohm for each
side.
Onthisassumptions,the following componentlistis
defined.
L3000S- L303015/29
