STLC3080 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC3080' PDF : 23 Pages View PDF
STLC3080
CONTROL INTERFACE
Slave mode (MODE=Low).
INPUTS
R0
R1
D0
D1
X
X
0
0
X
X
0
0
X
X
0
1
X
X
0
1
X
X
1
0
X
X
1
0
X
X
1
1
X
X
1
1
0/1
X
X
X
X
0/1
X
X
OPERATING MODE
D2
0 Power down
1 Stand-by
0 Active N.P.
1 Active R.P.
0 Ringing (with SLIC Active N.P.)
1 Ringing (with SLIC Active R.P.)
0 Ground start
1 High Impedance Feeding
X Rel 0 (on = 1, off = 0)
X Rel 1 (on = 1, off = 0)
OUTPUTS
DET
(Active Low)
GDK/AL
(Active Low)
disable
off/hk
off/hk
off/hk
ring/trip
ring/trip
off/hk
off/hk
def by D0-D2
def by D0-D2
disable
gnd-key
gnd-key
gnd-key
disable
disable
gnd-key
disable
def by D0-D2
def by D0-D2
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 15µA 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
Power Down Enable
Reset
Disable
Thermal
Alarm
Enable
DET
Disable
Disable
Low
GDK/AL
Disable
Disable
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.
Figure a: STLC3080 DC Characteristic in
Stand-By Mode.
I
16mA
RFEED = 2RP
D98TL307
V
VBAT -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).
4/23
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