CONTROL INTERFACE

Automatic activation mode (MODE=High).

Inpu ts

Operating Mode

(Mode = High)

Outputs

R0

R1

D0

D1

D2

RES

DET

GDK/AL

X

X

0

0

0

1

Power Down

disable

disable

X

X

0

0

1

1

Ringing

Ring-Trip

disable

X

X

0

1

0

1

On-Hook Transmission

Reverse Polarity

Off-Hook

Fault

Fault

X

X

0

1

1

1

On-Hook Transmission

Direct Polarity

Off_Hook

Fault

Fault

X

X

1

0

0

1

Active Direct Polarity

(default)

Off_Hook

Fault

Fault

X

X

1

0

1

1

Active Direct Polarity

(default)

Off_Hook

Fault

Fault

X

X

1

1

0

1

Active Reverse Polarity

Off_Hook

Fault

Fault

X

X

1

1

1

1

Active Direct Polarity

(default)

Off_Hook

Fault

Fault

0/1

X

X

X

X

1

R0 = 0/1: Rel0 = off/on

(1)

(1)

X

0/1

X

X

X

1

R1 = 0/1: Rel1 = off/on

(1)

(1)

XXXX

X0

Power Down; Rel0/1 = off

disable

disable

DET: On/Off Hook Signalling ; together with GDK/AL it is set Low also in case of Thermal Alarm or Ground-Key.

GDK/AL : Thermal Alarm or Ground-Key Signalling

(1) : DET and GDK/AL signalling function is related to D0,D1,D2 and it doesn’t depend on R0 and R1 setting.

As in Slave mode the control is performed

through a parallel bus, with independent chip se-

lects, CSIN and CSOUT, for inputs and outputs.

In Automatic Activation, once Active mode is se-

lected the device automatically selects the proper

operating mode (Active, Stand By or H.I. feeding)

depending on the loop status in order to optimise

the power consumption.

In order to guarantee the proper behaviour of the

internal state machine the ”CKRING” signal must

be always applied, this signal in fact is used to gen-

erate the ”WTIME” delay (see Appendix) necessary

to properly perform automatic state change.

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

Disable

Reset

Disable

Disable

Disable

Thermal

Alarm

Enable

Low

Low

Ringing

When Ringing mode is selected the STLC3080

activates the ringing relay injecting the ringing sig-

nal on the line.

As a Ring-Trip is detected the logic indicator DET

is set Low and the ringing relay is automatically

switched-off without waiting for the card control-

ler command (auto ring-trip).

DET remains latched Low

until the operative

mode is modified.

Ringing relay drive signal RELR must be synchro-

nised to a clock applied to CKRING input. This

clock is derived from the ringing signal with

proper time delay, according to the activation /

deactivation time of the relay.

RELR is activated on the low level of CKRING

clock. The duty cycle of CKRING can be modified

in order to activate the RELR when required:

CKRING low must last 1

µs minimum.

All the relay drivers are open-drain with the

source connected to RGND pin.

Each relay driver integrates a protection structure

to avoid external kick-back diodes using both 5V

or 12V relays.

The ring trip circuit and its behaviour is described

in Appendix D.

On-Hook Transmission.

Sets the Slic for conversation even though the line

is in On-Hook; it is required for On/Hook transmis-

sion purposes; Active mode cannot support a con-

versation when the line is in On-Hook as it automat-

ically turns in High Impedance Feeding.

Active.

The relevant feature of this setting is that when

Active Mode (D0D1D2=1XX) is set by the exter-

nal control , internally, the device is able to select

between three operative states according to the

status of the line:

STLC3080

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