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參數(shù)資料
| 型號(hào)： | STLC30R80 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | INTEGRATED RINGING SLIC FOR SHORT LOOP APPLICATIONS |
| 中文描述： | 綜合振鈴用戶接口短環(huán)路應(yīng)用 |
| 文件頁(yè)數(shù)： | 4/13頁(yè) |
| 文件大?。?/td> | 172K |
| 代理商： | STLC30R80 |
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A parallel interface allow to control the operation
of STLC30R80 through a control bus:
- D0 D1 D2 latched input bits defining the Slic
operation mode
- 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 CSIN and CSOUT inputs are provided
with a 15
μ
A pull-down current to prevent uncon-
trolled conditions in case the control bus goes
floating.
According to the table 6 operating modes can be
set:
1) Power-Down.
2) Stand-By.
3) Active N.P.
4) Active R.P.
5) Ringing
6) High Impedance Feeding.
Power-Down
It’s an idle state characterised by a very low
power consumption; any functionality is disabled.
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
Power Down
Reset
Thermal Alarm
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: STLC30R80 DC Characteristic in
Stand-By Mode.
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).
Resistive Region is programmable by means of
external resistor R
DC
, limiting current can be se-
lected by R
LIM
and R
switch
resistor.
CONTROL INTERFACE
INPUTS
OPERATING MODE
OUTPUTS
D0
D1
D2
DET
(Active Low)
disable
off/hk
off/hk
off/hk
ring/trip
off/hk
off/hk
GDK
/
AL
(Active Low)
disable
gnd-key
gnd-key
gnd-key
disable
disable
gnd-key
0
0
0
0
1
1
1
0
0
1
1
0
1
1
0
1
0
1
0/1
1
0
Power down
Stand-by
Active N.P.
Active R.P.
Ringing
High Impedance Feeding
Ground Start
16mA
R
FEED
= 2R
P
D98TL307
V
BAT
-7.8V
I
V
I
LIM
[20
÷
50mA]
R
FEED
=
R
DC
5
+2R
P
D99TL435
R
FEED
= 2R
P
V
BAT
V
BAT
-7.8V
I
V
Figure b. STLC30R80 DC Characteristic in
Active Mode.
STLC30R80
4/13
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