STLC3080 datasheet(4/23 Pages) STMICROELECTRONICS

4 / 23 page

A parallel interface allow to control the operation

of STLC3080 through a control bus:

- D0 D1 D2 latched input bits defining the Slic

operation mode

- R0 R1 latched input bits (active High) drive the

test relays.

- 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 R0 R1 CSIN and CSOUT inputs are

provided with a 15

µA pull-down current to prevent

uncontrolled conditions in case the control bus

goes floating.

According to the above table, 8 operating modes

can be set:

1) Power-Down.

2) Stand-By.

3) Active N.P.

4) Active R.P.

5) Ringing (with SLIC Active N.P.).

6) Ringing (with SLIC Active R.P.).

7) Ground start.

8) High Impedance Feeding.

Power-Down

It’s an idle state characterised by a very low

power consumption; any functionality is disabled;

only

relays Rel0 and Rel1 can be

driven by

proper setting of bits R0 and R1.

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

Rel0/1 Drive

DET

GDK/AL

Power Down

Enable

Disable

Reset

Disable

Thermal

Alarm

Enable

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 de-

tectors are active.

DC current is limited at 16mA (not programma-

ble); feeding characteristic shown in fig. a.

The voltage drop in on-hook condition is 7.8V.

Active

Mode selected to allow voice signal transmission.

When in ACTIVE mode the voltage drop in on-

hook condition is 7.8V in order to allow proper on-

hook transmission (Fig. b).

CONTROL INTERFACE

Slave mode (MODE=Low).

INPUTS

OPERATING MODE

OUTPUTS

DET

(Active Low)

GDK/AL

(Active Low)

0/1

Power down

Stand-by

Active N.P.

Active R.P.

Ringing (with SLIC Active N.P.)

Ringing (with SLIC Active R.P.)

Ground start

High Impedance Feeding

Rel 0 (on = 1, off = 0)

Rel 1 (on = 1, off = 0)

disable

off/hk

ring/trip

off/hk

def by D0-D2

disable

gnd-key

disable

gnd-key

disable

def by D0-D2

16mA

RFEED =2RP

D98TL307

VBAT -7.8V

Figure a: STLC3080 DC Characteristic in

Stand-By Mode.

STLC3080

4/23

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