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L3092N Datasheet

  • L3092N

  • SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECO...

  • 32頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L3000N - L3092
FUNCTIONAL DIAGRAM
L3000N
FUNCTIONAL DESCRIPTION
L3000N - HIGH VOLTAGE CIRCUIT
The L3000N line interface provides battery feed
for telephone lines and ringing injection. Both
these operations are done in Balance Mode. This
is very important in order to avoid the generation
of common mode signals in particular during the
pulse dialling operation of the telephone set con-
nected to the SLIC. The IC contains a state de-
coder that under external control can force the fol-
lowing
operational
modes
:
stand-by,
conversation and ringing.
In addition Power down mode can be forced con-
necting the bias current resistor to V
DD
or leaving
it open.
Two pins, I
L
and I
T
, carry out the information con-
cerning line status which is detected by sensing
the line current into the output stage.
The L3000N amplifies both the AC and DC signals
entering at pin 6 (VIN) by a factor equal to 40.
Separate grounds are provided :
- Analog ground as reference for analog sig-
nals
- Battery ground as a reference for the output
stages
The two ground should be shorted together at a
low impedance point.
6/32
L3092 - LOW VOLTAGE CIRCUIT
The L3092 Low Voltage Control Unit controls the
L3000N line interface module providing set up
data to set line feed characteristics and to inject
ringing. An on chip digital parallel interface allows
a microprocessor or a second generation
COMBO as the TS5070 to control all the opera-
tions.
L3092 defines working states of Line Interface
Circuit and also informs the card controller about
line status.
L3000N WORKING STATES
In order to carry out the different possible opera-
tions, the L3000N has several different working
states. Each state is defined by the voltage re-
spectively applied by pin 12 and 13 of L3092 to
the pins 12 and 11 of L3000N.
Three different voltage levels (鈥?, 0, +3) are avail-
able at each connection, so defining nine possible
states as listed in tab. 1.
Appropriate combinations of two pins define four
of the five possible L3000N working states that
are:
a) Stand-by (SBY)
b) Conversation (CVS)

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