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| (R) STLC30R80 INTEGRATED RINGING SLIC FOR SHORT LOOP APPLICATIONS MONOCHIP SLIC SUITABLE FOR SHORT LOOP APPLICATIONS IMPLEMENTES ALL KEY FEATURES OF THE BORSHT FUNCTION INTEGRATED RINGING SOFT BATTERY REVERSAL WITH PROGRAMMABLE TRANSITION TIME ON HOOK TRANSMISSION LOW POWER DISSIPATION IN ALL OPERATING MODES AUTOMATIC DUAL BATTERY OPERATION INTEGRATED RING TRIP DETECTION METERING PULSE INJECTION LOOP START, GROUND START FEATURES SURFACE MOUNT PACKAGE -40 TO +85C OPERATING RANGE DESCRIPTION The STLC30R80 is a SLIC device suitable for short loop applications. The SLIC provides the BLOCK DIAGRAM D2 D1 D0 TQFP44 (10 x 10) ORDERING NUMBER: STLC30R80 generation of the ringing signal and the standard battery feeding with full programmability of the DC characteristic. In particular two external resistors allow to set the limiting current value (up to 50mA) and the value of the resistive feeding when not in constant current region. CRT RT1 RT2 DET GDK/AL CSIN CSOUT RES SW LOGIC INTERFACE & DECODER LINE STATUS ILT SUPERVISION COMMANDS ILL LINE INTERFACE TIP RING AC+ DC AC DC TTXIN ZB TX RX AC PROCESSOR REFERENCE & BIAS SWITCHING DC PROCESSOR BGND + VREG ILTF RLIM RTH ZAC1 ZAC RS CAC IREF VCC VDD AGND CREV CSVR VBAT BASE RDC D99TL431AMOD November 2001 1/13 STLC30R80 PIN CONNECTION GDK/AL AGND AGND AGND BGND VREG 44 43 42 41 40 39 38 37 36 35 34 CSOUT CSIN D0 D1 D2 N.C. N.C. RES VDD VCC CRT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 SW. VBAT TX ZB RS ZAC ZAC1 N.C. N.C. AGND RX CSVR BASE RING DET TIP 33 32 31 30 29 28 27 26 25 24 23 CREV IREF RLIM RTH AGND RT1 RT2 ILTF RDC CAC TTXIN PINCON_STLC30R80 ABSOLUTE MAXIMUM RATINGS Symbol VBAT VCC VDD A/R/BGND Battery voltage Positive supply voltage Control Interface Supply Voltage AGND respect BGND Parameter Value -80 + VCC to +0.4 -80 + VREL to + 0.4 -0.4 to +7 -0.4 to +7 -2 to +2 Unit V V V V V OPERATING RANGE Symbol TopT VCC VDD VBAT A/BGND PD (70) PD(85) Positive supply voltage Control Interface Supply Voltage Battery voltage AGND respect BGND Max. power dissipation @ Tamb = 70C Max. power dissipation @ Tamb = 85C Parameter Operating temperature range Value -40 to +85 4.75 to 5.25 3 to 5.25 -72 to -15 -0.3 to +0.3 1.1 0.9 Unit C V V V V W W THERMAL DATA Symbol Rth j-amb Parameter Thermal resistance Junction to Ambient Typ. Value 60 Unit C/W 2/13 STLC30R80 PIN DESCRIPTION Pins 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Name CSOUT CSIN D0 D1 D2 N.C. N.C. RES VDD VCC CRT N.C. N.C. SW AGND VBAT TX ZB RS ZAC ZAC1 RX TTXIN CAC RDC ILTF RT2 RT1 AGND RTH RLIM IREF CREV CSVR BASE VREG BGND RING TIP AGND Description Chip-Select for output control bits DET and GDK . Active Low. (*) Chip-Select for input control bits latches D0 D1 D2 R0 R1 . Active Low. (*) Control Interface input bit 0. (*) Control Interface input bit 1. (*) Control Interface input bit 2. (*) Not connected Not connected Reset Input; active low. After activation the SLIC is put in Power Down state Control interface Power Supply. VDD = 3.3V or VDD = VCC. Positive Power Supply (+5V). Ring-Trip time constant capacitor. Not connected Not connected Internal switch/limiting current programming pin. Analog Ground Negative Battery Supply. 4 wires output stage (Transmitting Port). Cancelling input of Balance Network for 2 to 4 wires conversion. Protection resistors image. The image resistor is connected between this node and ZAC. AC impedance synthesis. RX buffer output/ AC impedance is connected between this node and ZAC. 4 wires input stage (Receiving Port). A 100K external resistor must be connected to AGND to bias the input stage. Metering Signal Input (AC) and Line Voltage Drop Programming (DC). If not used must be connectd to AGND. AC feedback input/ AC-DC split capacitor is connected between this node and ILTF. DC current feedback input. The RDC resistor is connected between this node and ILTF. Transversal Line Current Image. Input pin to sense ringing current , for Ring-Trip detection. Input pin to sense ringing current , for Ring-Trip detection. Analog ground. Off-Hook threshold programming pin. Limiting current programming pin. Voltage reference output to generate internal reference current. Reverse polarity transition time programming. Battery supply filter capacitor. Driver of the external transistor. Connected to the base. Regulated voltage. Provides the negative supply to the power line drivers. It is connected to the emitter of the external transistor. Battery ground. B wire termination output. IB is the current sunk into this pin. A wire termination output. IA is the current sourced from this pin. Analog ground. 3/13 STLC30R80 CONTROL INTERFACE INPUTS D0 0 0 0 0 1 1 1 D1 0 0 1 1 0 1 1 D2 0 1 0 1 0/1 1 0 OPERATING MODE Power down Stand-by Active N.P. Active R.P. Ringing High Impedance Feeding Ground Start DET (Active Low) disable off/hk off/hk off/hk ring/trip off/hk off/hk OUTPUTS GDK/AL (Active Low) disable gnd-key gnd-key gnd-key disable disable gnd-key A parallel interface allow to control the operation of STLC30R80 through a control bus: - D0 D1 D2 latched input bits defining the Slic operation mode - DET and GDK/AL , tri-state outputs, signal the status of the loop: On/Off-Hook and Ground-Key. Pin GDK/AL goes low also when the device thermal protection is activated or a line fault (Tip to Ring, Tip and/or Ring to Ground or VBAT) is detected (flowing current 7.5mA). -CSIN: chip select for input bits, active Low, strobes the data present on the control bus into the internal latch. - CSOUT: chip select for output bits ; active Low , when high DET and GDK/AL goes tri-state. D0 D1 D2 CSIN and CSOUT inputs are provided with a 15A pull-down current to prevent uncontrolled conditions in case the control bus goes floating. According to the table 6 operating modes can be set: 1) Power-Down. 2) Stand-By. 3) Active N.P. 4) Active R.P. 5) Ringing 6) High Impedance Feeding. Power-Down It's an idle state characterised by a very low power consumption; any functionality is disabled. It can be set during out of service periods just to reduce the power consumption. It is worth noticing that two other conditions can set the Slic in idle state but with some differences as reported in the table: Idle State Power Down Reset Thermal Alarm DET Disable Disable Low GDK/AL Disable Disable Low Stand-By. Mode selected in On-Hook condition when high immunity to common mode currents is needed for the DET bit. To reduce the current consumption, AC feedback loop is disabled and only DET and GDK/AL detectors are active. DC current is limited at 16mA (not programmable); feeding characteristic shown in fig. a. The voltage drop in on-hook condition is 7.8V. Figure a: STLC30R80 DC Characteristic in Stand-By Mode. I 16mA RFEED = 2RP D98TL307 VBAT -7.8V V Active Mode selected to allow voice signal transmission. When in ACTIVE mode the voltage drop in onhook condition is 7.8V in order to allow proper onhook transmission (Fig. b). Resistive Region is programmable by means of external resistor RDC, limiting current can be selected by RLIM and Rswitch resistor. Figure b. STLC30R80 DC Characteristic in Active Mode. I ILIM [20/50mA] RFEED = RDC 5 +2RP RFEED = 2RP D99TL435 VBAT VBAT -7.8V V 4/13 STLC30R80 Concerning AC characteristic the STLC30R80 allows to set 2W termination impedance by means of one external scaled impedance that may be complex. Two to four wire conversion is provided by an external network. Such network can be avoided in case of application with COMBOII, in this case the two to four wire conversion is implemented inside the COMBOII by means of the programmable Hybal filter. When in ACTIVE mode it is also possible to perform battery reversal in soft mode (with programmable transition time) without affecting the AC signal transmission. Ringing When ringing mode is selected, by toggling the D2 pin is possible to insert the ringing signal on the line: the ringing frequency is equal to the one applied to the D2 pin. The ringing signal is a balanced trapezoidal wave form where the TIP and RING voltages switch continuously between GND and VREG: VREG is obtained directly from VB1 (VREG = VB1 - 1.8V). The slope of the trapezoidal wave form is set by the external Crev capacitor and it allows to obtain ringing signal with distortion less than 10%: with a fine tuning of this capacitor is possible to obtain distortion value less than 5% (crest factor from 1.25 to 1.35). Figure c. Typical ringing wave form. GND TIP As the ring trip is detected the logic indicator DET is set low and the ringing is automatically disconnected without waiting for the card controller command (auto ring trip). Ringing with high REN number When ringing high number of REN, for example 5REN, or short loops, it could happen that the line AC current, trigger the ring trip circuit producing false ring trip. If this happens, a proper SW resistor (Rswitch) can be inserted between RLIM and the pin. The effect of this resistor is to improve the AC current capability in Ring mode avoiding false ring trip in presence of high REN numbers (typ. 5REN) and short loop. One side effect of Rswitch is to reduce ring trip sensitivity in presence of long loops; therefore it is recommended to adjust Rswitch properly checking the correct behaviour of the device in the two worst-case conditions: - 0 loop, Max REN# - Max loop length, 1 REN The lower is the Rswitch value; the higher is the immunity to false Ring trip, producing as side effect a lower Ring trip sensitivity on long loops. The typical value of Rswitch is shown in the External Components Table (pag.7.13) High Impedance Feeding. As Stand-By, this mode is set in On-Hook condition, with further reduced power consumption. Higher power efficiency turns back a lower immunity of the Off-Hook detector to line common mode currents. The DC feeding shows a constant current characteristic (Ilim = 17mA) followed by a resistive range with an equivalent series resistance RFEED = 1600 + 2Rp. Thermal protection circuit is still active, preventing the junction temperature, in case of fault condition, to exceed 150C In High Impedance Feeding most of the circuit is switched off, only the circuit, dedicated to OffHook detection, is powered. This allows to reduce Figure d. STLC30R80 DC Characteristic in High Impedance Feeding I 17mA RFEED = 1600 +2RP 3V typ. 60V typ. dV/dT set by CREV RING VREG 3V typ. The VB1 value must be higher enough (~70V) in order to obtain ringing signals with more than 40Vrms. The VB2 battery is used only when the line is in off hook and its value can be reduced (typ. 24V) in order to minimize the power consumption. The ring trip detection is performed sensing the variation of the AC line impedance from on-hook (relatively high) to off-hook (relatively low). This particularly ring trip method allows to operate without DC off-set superimposed on the ringing signal and therefore obtaining the maximum possible ring level on the load starting from a given negative battery. It should be noted that such a meted is optimized for operation on short loop applications and may not operate properly in presence of long loop (>500 Ohm). D98TL373 VBAT -0.8V V 5/13 STLC30R80 Figure 1. Logic Interface Input Timing t1 t3 t2 t1 t2 t3 t4 t5 t6 Min. 100ns 100ns 500ns 100ns 100ns 500ns CSIN D0.1.2 CSOUT DET, GDK Note: All measurements are performed with 100pF on outputs pin and with TTL compatible voltage levels. t4 t6 t5 Figure1_STLC30R80 the total power consumption in On-hook to 30mW (typical). The Off-Hook detection threshold is not programmable but defined at a fixed IDETHI = 8mA(max.) Ground Start. This mode is selected when the SLIC is adopted in a system using the Ground Start feature. In this mode the TIP termination is set in High Impedance (100k) while the RING one is active and fixed at Vbat +4.8V. In the case of connection of RING termination to GND the sinked current is limited to 30mA. When RING is connected to GND both Off-Hook and Ground-Key detectors become active. Power dissipation in this mode with a -48V battery voltage is 100mW. PROTECTION CIRCUIT Suggested protection circuit is based on programmable Trisils (like LCP1511/2) as shown in Fig.2 and Fig. 3, and the surge current is limited by the resistors RPT2 and RPR2, which are PTC types , protecting the device against both lightning and power-cross. METERING PULSE INJECTION STLC30R80 provides external pins and components for Metering Pulse injection. TTXIN pin is the input for the 12kHz or 16kHz Metering Pulse injection. This pin also provides a DC constant current source that is injected into the external RDA resistor (typ. 10k) connected between TTXIN pin and AGND. The voltage drop across TIP and RING line amplifiers and, consequentally the AC swing available. When Metering Pulse injection is not used and voltage drop is not required, TTXIN must be shorted to AGND and RTTX, RDA and CTTX external components must be removed. The TTX cancellation is obtained through an external RTTX and CTTX network connected between 6/13 TTXIN and CAC pins. MISCELLANEOUS - Thermal overload: the integrated thermal protection is activated when Tj reaches 150C typ.; the Slic is forced in Power-down mode, DET and AL are set Low. - One low cost external transistor allows to reduce the power dissipated in the SLIC itself allowing the use of extreme small size package (TQFP44). The external transistor size/package can be selected depending on the max. power requested by the particular application. EXTERNAL COMPONENTS LIST To set the SLIC into operation the following parameters have to be defined: - The DC feeding resistance "Rfeed" defined as the resistance of the traditional feeding system (most common Rfeed values are: 400, 800, 1000 ohm). - The AC SLIC impedance at line terminals "Zs" to which the return loss measurements is referred. It can be real (typ. 600 ohm) or complex. - The equivalent AC impedance of the line "Zl" used for evaluation of the trans-hybrid loss performance (2/4wire conversion). It is usually a complex impedance. - The value of the two protection resistors Rp in series with the line termination. - The reverse polarity transition time defined as "VTR/T". - The constant current limit value "Ilim". - Rth: sets the OFF/Hook DETection threshold Once, the above parameters are defined, it is possible to calculate all the external components using the following table. STLC30R80 EXTERNAL COMPONENTS Name RREF (*) CSVR CRT RDC CAC RS ZAC ZA ZB CCOMP RS1 RS2 QEXT RPT1 RPR1 RLIM (*) RSWITCH (***) RTH (**) CREV Function Formula Internal current reference programming 1.16 IREF = resistor RREF Battery ripple rejection capacitance 1 CSVR = 2 fp 1.3M Ring Trip capacitance CRT = (25/fring) 470nF DC sinthesized resistance programming resistor AC/DC splitter capacitance Protection resistor image 2 wire AC impedance SLIC impedance balancing network Line impedance balancing network AC feedback compensation capacitance Sensing resistor for Ring Trip Sensing resistor for Ring Trip External transistor Line series resistor Line series resistor Current limiting setting resistor Current limiting setting resistor OFF/HOOK DETection threshold setting resistor. Polarity reversal transition time programming RDC = 5[Rfeed -2Rp] RDC 1k CAC = 1 2 fsp RDC RS = 25 2Rp ZAC = 25[Zs - 2Rp] ZA = 25 Zs ZB = 25 Zl 2 2 fo[100 Rp] 1000 RR 1000 RR (1) 20 20 Typical Value 30.1k 1% 100nF 10% 100V @ fp = 1.22Hz 470nF 20% 6V @ 25Hz 1.5k 1% 10F 20% 15V @ fsp = 10Hz 2.5k 1% 12.5k 1% 15k 1% 15k 1% 220pF 20% @ fo = 250kHz 600k 0.5% 600k 0.5% BD140, MJD32 20W 1/4W 20 1/4W 1% 51.1k 1% 47k 26.1k 1% CCOMP = 1.16 ; 26k / 64.9k ILIM 24.4k RLIM [k] Rswitch [k] = RLIM [k] - 24.4k 1.16 RTH = 200 ; 23.7k / 86.6k RLIM = 103 ITH CREV = K 1 ; K= 3750 VTR T 47nF for 5.67V/ms RDA RTTX CTTX Output Voltage Drop Adjustment Teletax Cancellation Resistor Teletax Cancellation Capacitor RDA = Drop 20k 9.6 - Drop RTTX = 12.5 [Re (ZLTTX) + 2RP] 1 10k (Drop = 3.2V) (2) 3.75k CTTX = 8 8 (12.5 Im (ZLTTX) 2 fTTX) RPT2 RPR2 D1 D2 CH CVCC CVB Protection resistor Protection resistor Overvoltage protection Dual Battery Operation Trans-Hybrid Loss Frequency Compensation Power Supply Filter Battery Supply Filter CH = CCOMP 1N4448 1N4448 220pF 30% 100nF 20% 100nF 20% 100V Notes: (1) Transistor characteristics: hFE 25, IC 100mA, VCEO 60V, fT 15MHz. PDISS depends on application, see Appendix. For SMD application possible alternatives are MJD350 in D-PACK or BCP53 in SOT223 (2) Typical value needed for 2.2Vrms metering pulse level, if no metering RDA = 0. (*) RREF and RLIM should be connected close to the corresponding pins of STLC30R80. Avoid any digital line or high voltage swing line to pass close to IREF and RLIM pins. Eventually screen these pins with a GND track. (**) Inside the formula the coefficient 1.16 must be changed to 1.2 if the selected value of ITh is lower than 5mA. (***) This resistor must be used only in presence of REN number and short loop see description at page 5/13. 7/13 STLC30R80 Figure 2. Typical application diagram. VCC VDD To RSWITCH Resistor ZAC1 ZAC ZA CCOMP RS RX TX ZAC RS RX TX ZB CH ZB D0 D1 D2 CONTROL INTERFACE DET GDK/AL CSIN CSOUT RES TTX D0 D1 D2 DET GDK/AL CSIN CSOUT RES TTXIN VCC VDD AGND BGND SW TIP RPT1 RPT2 TIP LCP 1511 RING RPR2 VB1 RPR1 RING RS1(*) RT1 STLC30R80 VREG BASE RT2 VBAT VB1 CSVR CREV VB2 RS2(*) D1 D2 QEXT CAC ILTF RDC RDC CRT IREF REF RLIM RTH RTH (1) RDA RTTX CRT CREV CSVR CTTX (*) 1% match, 600K typ. (1) Components needed only for Metering pulse injection. (2) to be inserted only for 5REN application CAC RLIM RSWITCH (2) From SWITCH PIN D99TL433CMod Figure 3. Test Circuit. CVCC VCC VDD To RSWITCH Resistor ZAC1 ZAC 12.5K ZA 15K CCOMP 220pF RS 2.5K RX TX ZAC RS RX TX ZB CH 220pF ZB 15K VCC VDD AGND BGND SW RPT1 20 TIP LCP 1511 RPT2 30 TIP VBRPR1 20 RING RPR2 30 RING RT1 D0 D1 D2 D0 D1 D2 DET GDK/AL CSIN CSOUT RES TTXIN CAC RDA 10K RTTX 3.75K CTTX 1F ILTF RDC RDC 1.5K CRT RREF CRT 470nF RLIM CSVR CREV RTH RTH 26.1K CREV 47nF CSVR 100nF RT2 VBAT CVB VB1 VB2 RS1(*) 600K STLC30R80 VREG BASE RS2(*) 600K QEXT BD140 D1 1N4448 CONTROL INTERFACE DET GDK/AL CSIN CSOUT RES TTX CAC RREF 30.1K (*) 1% match, 600K typ. 10F RLIM 51.1K RSWITCH From SWITCH PIN D99TL434CMod 8/13 STLC30R80 ELECTRICAL CHARACTERISTICS (Test Condition, unless otherwise specified: VCC = 5V, VDD = 3.3V, VB- = -48V, AGND = BGND, Tamb = 25C). Note: the limits below listed are guaranteed with the specified test condition and in the 0 to 70C temperature range. Performance over -40 to +85C range are guaranteed by product characterisation. Symbol Parameter Test Condition Min. Typ. Max. Unit mApk mApk mApk Fig. AC CHARACTERISTICS Zil Iil Long. Impedance Long. Current Capability AC each wire H.I. feeding per wire (ON-HOOK) STANDBY or ACTIVE per wire (ON-HOOK) ACTIVE per wire (OFFHOOK). IT = Transversal Current L/T T/L 2wRL THL Ovl TXoff G24 G42 G24fq G42fq V2wp V4wp Thd GTTX Long. to transv. Transv. to long. 2W return loss. trans-hybrid loss. 2W overload level TX output offset Transmit gain abs. Receive gain abs. tx gain variation vs. frequency rx gain variation vs. frequency idle channel noise at line terminals idle channel noise at TX port total harm. dist. 2w-4w, 4w2w Transfer Gain 0dBm 1020Hz 0dBm 1020Hz rel. 1020Hz, 0dBm 300 to 3400Hz rel. 1020Hz, 0dBm 300 to 3400Hz psophometric psophometric 0dBm, 1KHz Il = 20 to 45mA VTTX = 100mVRMS @ 16kHz VL GTTX = 20Log VTTX with RL = 200 THD (TTX) TTX Harmonic Distortion 2.2VRMS = on 200 3 % 14.5 300 to 3400Hz 1020Hz; 20Log |VRX/VTX| ACTIVE MODE at line terminals on ref. imped. with nominal Rp value 60 40 22 30 3.2 -200 -12.38 5.74 -0.1 -0.1 -82 -90 200 -12.02 6.1 0.1 0.1 -78 -84 -50 5 13 80 -IT 40 dB dB dB dB dBm mV dB dB dB dB dBmp dBmp dB dB C5 C3 C6 C2 C4 C1 C8 C7 DC CHARACTERISTICS (TTX pin connected to ground) Vlohi Vlo Ilims Ilimb Ilima Rfeed Rfeed H.I. Line voltage Line voltage Short circ. curr. Short circ. curr. Lim. current accuracy Feed res. accuracy Feeding resistance Il = 0, H.I. feeding Il = 0, SBY/ACTIVE/ONHOOK Rloop = 0, SBY Rloop = 0, H.I. feeding Rel to progr. val. 20 to 45mA ACTIVE NP, RP ACTIVE NP, RP H.I. feeding 47 38.6 14 11 -10 -10 1100 47.4 39.9 16 17 47.8 40.6 18 20 10 10 2100 V V mA mA % % 9/13 STLC30R80 ELECTRICAL CHARACTERISTICS (continued) Symbol Ilact Ilsby ITIP IGS IDA Parameter Feed current ACTIVE Feed current STBY Tip Leackage Current Ring Lead Current Reference current sourced by TTX IN pin for Voltage Drop programming Test Condition ACTIVE NP, RP Rloop = 1900 RDC = 1.5k STY, Rloop = 2.2K RDC = 1.5k Ground Start Ground Sart Ring to GND 33 -60 Min. 18 13 1 Typ. Max. Unit mA mA A mA A Fig. DETECTORS Idet Off-hook current threshold ST-BY, ACTIVE Off-Hook current threshold Off/On hook hyst. Dialling distortion Ground Key Current threshold ILL = IB - IA Ground Start Detection Threshold Rel. to progr. val. 7 to 11mA Rel. to progr. val. 3 to 6mA H.I. feeding ST-BY, ACTIVE ACTIVE TIP to RING to GND or RING to GND Igst = 2 Idet -10 -1 7.5 -10 -20 5 15% Idet +1 +10 +20 8 % % mA mA ms mA Idet H.I. Hys Td ILL Igst +10 % DIGITAL INTERFACE INPUTS: D0, D1, D2, CSIN, CSOUT Vih Vil Iih Iil Input high voltage Input low voltage Input high current Input low current VDD = 3.3V VDD = 3.3V 2 0.8 30 10 V V A A OUTPUTS: DET, GDK /AL Vol Voh IOZ Output low voltage Output high voltage Tri-State Output Current Iol = 0.75mA; CSOUT = LOW Ioh = 0.1mA; CSOUT = LOW CSOUT = High 2.4 -10 +10 0.5 V V A POWER SUPPLY REJECTION PSRRC PSRRB VCC to 2W port Vbat to 2W port Vripple = 0.1Vrms 50 to 4000Hz Vripple = 0.1Vrms 50 to 4000Hz 27 30 dB dB C9 C9 POWER CONSUMPTION ICC VCC supply current H. I. Feeding On-Hook SBY On Hook ACTIVE On Hook H. I. Feeding On-Hook SBY On Hook ACTIVE On Hook Any operating mode 100 1.0 3.5 5.0 0.5 2.5 4.5 320 mA mA mA mA mA mA A IBAT VBAT supply current IDD VDD Supply Current 10/13 STLC30R80 APPENDIX A Battery voltage autoset The STLC30R80 shows a line voltage depending on the voltage applied to Vbat pin. In particular in the On-Hook the line voltage is Vbat if the SLIC is put in HI-Z mode or Vbat -7.8V if the SLIC is put in Active mode. If the battery voltage applied to the Vbat pin is always -70V (necessary to generate the proper ringing signal), during the On-Hook the line voltage is higher than 60V. A simple circuit to generate the proper Off-Hook battery voltage can be used starting from the -70V as shown in the below figure A1. The RING command (active low) is used to switch on the NPN transistor and apply the battery voltage directly to the Vbat pin. When the RING command is high the NPN transistor is off and the zener diode reduces the voltage applied to the Vbat pin. Figure A1. VCC 470K RING 47K BC556 STLC30R80 VBAT 68K BC558 24V 470K D00TL461 BATTERY VOLTAGE (-70V) 11/13 STLC30R80 DIM. MIN. A A1 A2 B C D D1 D3 e E E1 E3 L L1 K 0.45 0.05 1.35 0.30 0.09 12.00 10.00 8.00 0.80 12.00 10.00 8.00 0.60 1.00 0.75 0.018 1.40 0.37 mm TYP. MAX. 1.60 0.15 1.45 0.45 0.20 0.002 0.053 0.012 0.004 0.472 0.394 0.315 0.031 0.472 0.394 0.315 0.024 0.039 0.030 0.055 0.014 MIN. inch TYP. MAX. 0.063 0.006 0.057 0.018 0.008 OUTLINE AND MECHANICAL DATA TQFP44 (10 x 10) 0(min.), 3.5(typ.), 7(max.) D D1 A A2 A1 33 34 23 22 0.10mm .004 Seating Plane E1 B 44 1 11 12 E B C e L K TQFP4410 12/13 STLC30R80 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com 13/13 |
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