STLC3080 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STLC3080 Datasheet PDF : 23 Pages
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STLC3080
CONTROL INTERFACE
Automatic activation mode (MODE=High).
R0
R1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0/1
X
X
0/1
X
X
Inpu ts
D0
D1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
X
X
X
X
X
X
D2 RES
0
1
1
1
0
1
1
1
0
1
1
1
0
1
Operating Mode
(Mode = High)
Power Down
Ringing
On-Hook Transmission
Reverse Polarity
On-Hook Transmission
Direct Polarity
Active Direct Polarity
(default)
Active Direct Polarity
(default)
Active Reverse Polarity
1
1
Active Direct Polarity
(default)
X
1
R0 = 0/1: Rel0 = off/on
X
1
R1 = 0/1: Rel1 = off/on
X
0
Power Down; Rel0/1 = off
Out puts
DET
GDK/AL
disable
disable
Ring-Trip
disable
Off-Hook
Fault
Fault
Off_Hook
Fault
Fault
Off_Hook
Fault
Fault
Off_Hook
Fault
Fault
Off_Hook
Fault
Fault
Off_Hook
Fault
Fault
(1)
(1)
(1)
(1)
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 properlyperform 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.
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 1µs 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.
It can be set during out of service periods just to
reduce the power consumption.
The ring trip circuit and its behaviour is described
in Appendix D.
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
Enable
Alarm
DET
Disable
Disable
Low
GDK/AL
Disable
Disable
Low
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.
Ringing
When Ringing mode is selected the STLC3080
activates the ringing relay injecting the ringing sig-
nal on the line.
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:
6/23
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