L3000N datasheet(26/32 Pages) STMICROELECTRONICS

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APPENDIX B

ADDITIONAL OPERATING FEATURES

Two further operating modes are provided on the

L3092, boosted battery and ring pause. Both of

these Modes are accessed by appllying a high

impedance on inputs AUT and or RING of the

digital interface.

1.Boosted Battery (BB)

This operating mode is equivalent to conversation

mode with respect to AC and signaling functions

but with the following changes to the DC charac-

teristics:

a) Current limiting value fixed at 25mA.

b) Characteristic in the resistive feeding re-

gion corresponds to a battery voltage

equal to (-5 + |VB-|+ VB+)Volt in series

with the same feeding resistor utilized in

the

DC characteristic of

conversation

mode.

BB mode is typically used to feed long lines

(20mA/4Kohm) and to implement special func-

tions such as message waiting where high volt-

age signals are required.

Further information about this opersating mode

may be found by referring to the L3000/L3030

datasheet.

2.Ringing Pause Mode

During Ring Pause - Mode the SLIC is always in

ringing mode but the AC ringing signal is not in-

jected into the line. This mode allows to avoid any

common mode voltage variation of TIP and RING

wire during the transition bteween Ringing Burst

and Ringing Pause. This feature is used in appli-

cation where it is mandatory to avoid perturba-

tions on adjacent lines during ringing injection.

For example when in the same system analog

lines are used both for speech and modem trans-

mission.

The following table shows all operating modes of

L3000/L3092 SLIC KIT. Boosted Battery or Ring-

ing Pause Modes are selected by applying a high

impedance (HI) to input pins RNG and/or AUT.

Included also in this table are the operating

modes to which the SLIC defaults automatically

during ringing mode when OFF HOOK is de-

tected.

CONTROL INTERFACE BETWEEN THE SLIC AND THE CARD CONTROLLER

Operating Mode

Input Pin

Output Pin

RNG

PWON

AUT

LIM

ONHK

GDK

Conversation 25mA

Conversation 40mA

Conversation 60mA

1 on-hook

0 off-hook

1 Ground key not

detected

0 Ground key detected

Boosted Battery 25mA

Stand-by

Disable

Automatic Stand-by

Power Down

C1 Comparator Output

Disable

Test Mode

1 on-hook

0 off-hook

0 Limiting Region

1 Resistive Region

Ringing Inj. (CVS 25mA)

Ringing Inj. (CVS 40mA)

Ringing Inj. (CVS 60mA)

1 on-hook

0 off-hook

Disable

Ringing Inj. (BB 25mA)

Ringing Pause (CVS

25mA)

Ringing Pause (CVS

40mA)

Ringing Pause (CVS

60mA)

Ringing Pause (BB 25mA)

NB:

HI = High Impedance

BB = Boosted Battery

L3000N - L3092

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