stlc3040 STMicroelectronics, stlc3040 Datasheet - Page 7

• Manufacturer Part Number: stlc3040
• Description: Subscriber Line Interface Codec Filter, Cofislic
• Manufacturer: STMicroelectronics

tance.
All operating modes with related C/I command
bits and CR register bits are shown in table 13
pag 45.
4.3.1 POWER DOWN
In this condition SLIC Kit reduces strongly its
power consumption allowing Off-Hook detection.
Only the internal circuitry dedicated to the Off-
Hook detection is switched on.
C/I and CR1 register configuration (programmed
by Monitor) defining Power Down Submodes are
here below shown:
Table 4: Power Down Submodes
4.3.1.1 - External Indication
When this mode is selected both STLC3040 and
HV (L3000N, L3000S, STLC3170) are set in
Power Denial. STLC3040 cuts the bias current,
sunk by the HV (L3000N, L3000S, STLC3170) via
the PDO pin. In this mode the HV (L3000N,
L3000S) shows a high impedance on TIP and
Figure 5: Application Diagram.
SLIC KIT MODE
EXTERNAL
INDICATION
LOOP OPEN
STAND BY
GROUND START
RP
RP
C/I
(7)
0
0
0
0
RT
C/I
(6)
0
0
0
0
RING
RR
MNT
TIP
BGND AGND VCC
C/I
(5)
0
1
0
0
Power SO20
CR1
L3000S
VB-
(7)
X
0
1
1
CR1
(3)
X
X
0
1
DS
VB+
D95TL203B
BGND
CR1
(2)
X
X
0
1
VIN
REF
IT
IL
C1
C2
VBIM
CDVB
VOUT
VBIM
PDO
VL2
VL1
RING pins; theHV shows on TIP pin the RT im-
pedance and on RING pin the RR impedance if it
integrates the 2 external resistors RT and RR
(STLC3170). This mode is used to get a low
power consumption obtaining supervision only via
the STLC3040 and a resistive sensing network.
The total power consumption of the SLIC Kit in
this mode is under to 50mW (being almost 0 the
consumption from battery).
4.3.1.2 - Loop Open
This mode can be selected only if the High Volt-
age integrates the two external resistors (RR, RT
see fig. 5) of the feeding and sensing circuitry.
This is implemented on the STLC3170 high volt-
age device.
4.3.1.3 - Stand-By
SLIC behaves like a constant current source with
typical 7mA feeding current. Open loop voltage is
equal to (V
sumption is reduced to 150mW typical. Current
limit and Off-Hook threshold are programmable
by register CR7. Both off-hook and ground-key
detectors are operating.
4.3.1.4 - Ground Start
The SLIC is set in Stand-By with the TIP wire (the
most positive wire) in high impedance.
The current feeding is equal to Stand-By mode
current feeding.
C1
C2
REF
REF
IT
IL
V
CC
VCC
RAC
RAC
VDD
STLC3040
44PLCC
bat
RDC
RDC
VEE
- 5.85V). COFISLIC power con-
AGND DGND
ACDC
CAC
CAC
EXT
SEL24
DU/DD(2)
DCL
FSC
TSn(3)
IOn(2)
O1
I1
MR
IDn(3)
STRn/SIRn(7)
CAP
CAP
STLC3040
7/49