SGS Thomson Microelectronics STLC30R80 Datasheet

FOR SHORT LOOP APPLICATIONS

MONOCHIP SLIC SUITABLE FOR SHORT LOOP APPL I CATIONS

IMPLEMENTES ALL KEY FEATURES OF THE BORSHT FUNCTION

INTEGRATED RINGIN G SOFT BATTERY REVERSAL WITH PRO-

GRAMMABLE TRANSITION TIME ON HOOK TRANSMISSION LOW POWER DISSIPATION IN ALL OPER-

ATING MODES AUTOMATIC DUAL BATTERY OPERATION INTEGRATED RING TRIP DETECTION METERING PULSE INJECTION LOOP START, GROUND START FEATURES SURFACE MOUNT PACKAGE

-40 TO +85°C OPERATING RANGE

DESCRIPTION

The STLC30R80 is a SLIC device suitable for short loop applications. The SLIC provides the

STLC30R80

INTEGRATED RINGING SLIC

TQFP44 (10 x 10)

ORDERING NUMBER:

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.

STLC30R80

BLOCK DIAGRAM

DET

GDK/AL

CSIN

CSOUT

RES

TTXIN

ZB TX

ZAC1

D0D1D2

LOGIC

INTERFACE

DECODER

PROCESSOR

RSZAC

RT1 RT2CRT

LINE STATUS

ILT

SUPERVISION

COMMANDS

REFERENCE

BIAS SWITCHING

IREF V

CAC AGND CREV CSVR

ILL

AC+

DC AC

LINE

INTERFACE

PROCESSOR

VBAT BASE RDC

TIP

RING

BGND VREG ILTF

RLIM RTH

D99TL431AMOD

November 2001

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STLC30R80

PIN CONNECTION

CSOUT

CSIN

D0 D1

D2 N.C. N.C. RES

VDD VCC CRT

BGND

RING

TIP

AGND

DET

GDK/AL

44 43 42 41 3940 38 37 36 35 34

1 2 3 4 5 6 7 8 9

12 13 14 15 16

SW.

N.C.

171118 19 20 21 22

VBAT

AGND

VREG

ZAC

BASE

CSVR

33 32 31 30 29 28 27 26 25 24 23

PINCON_STLC30R80

ZAC1

CREV IREF RLIM RTH AGND RT1 RT2 ILTF RDC CAC TTXIN

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

BAT

Battery voltage -80 + VCC to +0.4

-80 + V

REL

to + 0.4

Positive supply voltage -0.4 to +7 V Control Interface Supply Voltage -0.4 to +7 V

A/R/BGND AGND respect BGND -2 to +2 V

OPERATING RANGE

Symbol Parameter Value Unit

opT

BAT

Operating temperature range -40 to +85 °C Positive supply voltage 4.75 to 5.25 V Control Interface Supply Voltage 3 to 5.25 V Battery voltage -72 to -15 V

A/BGND AGND respect BGND -0.3 to +0.3 V

PD (70) Max. power dissipation @ Tamb = 70°C 1.1 W

PD(85) Max. power dissipation @ Tamb = 85°C 0.9 W

THERMAL DATA

Symbol Parameter Value Unit

th j-amb

Thermal resistance Junction to Ambient Typ. 60 °C/W

V V

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STLC30R80

PIN DESCRIPTION

Pins Name Description

1 2 3 D0 Control Interface input bit 0. (*) 4 D1 Control Interface input bit 1. (*) 5 D2 Control Interface input bit 2. (*) 6 N.C. Not connected 7 N.C. Not connected 8

9V 10 V 11 CRT Ring-Trip time constant capacitor. 12 N.C. Not connected 13 N.C. Not connected 14 SW Internal switch/limiting current programming pin. 15 AGND Analog Ground 16 V 17 TX 4 wires output stage (Transmitting Port). 18 ZB Cancelling input of Balance Network for 2 to 4 wires conversion. 19 RS Protection resistors image. The image resistor is connected between this node and ZAC. 20 ZAC AC impedance synthesis. 21 ZAC1 RX buffer output/ AC impedance is connected between this node and ZAC. 22 RX 4 wires input stage (Receiving Port). A 100K external resistor must be connected to AGND to

23 TTXIN Metering Signal Input (AC) and Line Voltage Drop Programming (DC). If not used must be connectd

24 CAC AC feedback input/ AC-DC split capacitor is connected between this node and ILTF. 25 RDC DC current feedback input. The RDC resistor is connected between this node and ILTF. 26 ILTF Transversal Line Current Image. 27 RT2 Input pin to sense ringing current , for Ring-Trip detection. 28 RT1 Input pin to sense ringing current , for Ring-Trip detection. 29 AGND Analog ground. 30 RTH Off-Hook threshold programming pin. 31 RLIM Limiting current programming pin. 32 IREF Voltage reference output to generate internal reference current. 33 CREV Reverse polarity transition time programming. 34 CSVR Battery supply filter capacitor. 35 BASE Driver of the external transistor. Connected to the base. 36 VREG Regulated voltage. Provides the negative supply to the power line drivers. It is connected to the

37 BGND Battery ground. 38 RING B wire termination output. IB is the current sunk into this pin. 39 TIP A wire termination output. IA is the current sourced from this pin. 40 AGND Analog ground.

CSOUT Chip-Select for output control bits DET and GDK . Active Low. (*)

CSIN Chip-Select for input control bits latches D0 D1 D2 R0 R1 . Active Low. (*)

RES Reset Input; active low. After activation the SLIC is put in Power Down state

DD CC

BAT

Control interface Power Supply. VDD = 3.3V or VDD = VCC. Positive Power Supply (+5V).

Negative Battery Supply.

bias the input stage.

to AGND.

emitter of the external transistor.

3/13

STLC30R80

CONTROL INTERFACE

INPUTS

D0 D1 D2

0 0 0 0 1 1 1

0 0 1 1 0 1 1

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

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.

GDK/AL goes low also when the device

Pin thermal protection is activated or a line fault (Tip to Ring, Tip and/or Ring to Ground or VBAT) is detec ted (flowing c urren t ≥ 7.5mA).

CSIN: chip select for input bits, active Low,

strobes the data present on the control bus into the internal latch.

CSOUT: c h i p s el ect for o u tpu t b it s ; a c tive L ow ,

when high DET and GDK/AL goes tri-state.

D0 D1 D2

CSIN and CSOUT inputs are provided with a 15µA 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 DET GDK/AL

Power Down Disable Disable

Reset Disable Disable

Thermal Alarm Low Low

OUTPUTS

DET

(Active Low)

disable

off/hk off/hk off/hk

ring/trip

off/hk off/hk

GDK/AL

(Active Low)

disable gnd-key gnd-key gnd-key

disable

disable gnd-key

Stand-By.

Mode selected in On-Hook condition when high immunity to common mode currents is needed for

DET bit.

the To reduce the current consumption, AC feedback

loop is disabled and only

DET and GDK/AL de-

tectors are a ct ive . DC current is limited at 16mA (no t programma-

ble); 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.

16mA

= 2R

D98TL307

FEED

BAT

-7.8V

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 R lected by R

LIM

and R

, limiting current can be se-

resistor.

switch

Figure b. STLC30R80 DC Characteristic in

Active M o de.

[20÷50mA]

LIM

D99TL435

FEED

= 2R

FEED

BAT

-7.8V

+2R

BAT

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