stlc3040 STMicroelectronics, stlc3040 Datasheet - Page 26

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

STLC3040
5. APPLICATION & EXTERNAL COMPONENTS
LIST
Typical COFISLIC application is shown in Fig. 5.
It shows the HV (L3000N, L3000S, STLC3170)
driving the phone line and interfacing the COFIS-
LIC with the external components summarized in
the following table.
Table 11:
(*) unbiased capacitor
L3000N and L3000S require dotted components
(see fig. 5) for Off/Hook detection in "External In-
dication" (see table 12).
Table 12:
6. INTEGRATED TEST FEATURES
The device has built-in several functionalities
dedicated to perform generic testing.
Each test is enabled if CR2.3 (TMN) bit is set to 1.
In each test description more details about active
functionalities are written.
6.1.1. LINE TEST MODE 1 (TST-LEAK)
Enabled by CR2.3 = 1 and CR5 (3:0) = 01h and
CR8.1 = 0.
A trapezoidal signal (see Fig. 10) is sent to 2-wire line.
Figure 10.
26/49
C
CDVB
RT, RR
R
CAP
R
R
Ref
AC
DS
REF
Ref
AC
DC
(*) 11 F 5V 20%
GND
37.2k
Typ. Value
47 F - 20V
1620 1%
V
820
T1=T2=T3=T4=100ms
V
V
V
V
V
Typ. Value
PP
BAT 49
DROP
PP
PP
OUT
OUT
100nF
=
=
T1
20%
33k
= (V
= (V
32.7
= -170mV - 15 CR10[7:3]
25
40
40
1%
PP
PP
1%
V if CR9.7=0
V if CR9.7=1
+ V
+ V
DROP
DROP
T2
Bias resistor (I
AC reference impedance
DC reference impedance
AC/DC current splitting
Protective Shottky Diode
Battery Reversal Capacitor
Battery Voltage Rejection
+ R
+ R
Line Feed
X
X
) =
) = 1 if CR 9.7 = 0
T3
17
13
if CR 9.7 = 1
Function
Function
D95TL206C
T4
ref
) @ V
V
DROP
DD
If CR1.2 = 0, CR1.3 = 0, line current is measured
allowing line resistance and capacitance to be ob-
tained.
If CR1.2 = 1, CR1.3 = 0, TIP wire leakage to
ground is measured with RING wire in high im-
pedance.
If CR1.2 = 0, CR1.3 = 1, RING wire leakage to
ground is measured with TIP wire in high imped-
ance.
Measured value, available on Tx B1 byte:
6.1.2. LINE TEST MODE 2 (TST-LKA)
Enabled by CR2.3 = 1, CR5 [3:0] = 02h and
CR8.1 = 0.
The setup is the same of Test 1 except the meas-
ured value that is:
If CR1.2 = 1, CR1.3 = 0, TIP wire leakage to
ground is measured with RING wire in high im-
pedance.
If CR1.2 = 0, CR1.3 = 1, RING wire leakage to
ground is measured with TIP wire in high imped-
ance.
50
Operating Mode:
B filter:
Z filter:
Rx Path:
Tx Path:
R, X, GX, GR Filters:
KD filter:
DC Synthesis:
TTX:
Internal Tone Generation
in Rx:
Hook Detection:
I
High-Pass Filters:
Reverse Polarity
Boosted Battery
I
LIM
t
I
R
CR8.0 = 1 Active Modulation for returned value.
50
t
I
t
DC
= transversal line current
R
6
DC
= DC reference resistance (typically 820 )
R
6
DC
Tx GAIN
/
/ C
AC
Tx GAIN
Test dedicated, H.V. Active
Off
Off
Functional
Functional with input
connected to RDC
resistance.
Programmable
Programmable (suggested
max value to avoid
saturation = 0800h)
Off
Not Applicable
Only 1KHz Available
As in Active Mode
Off
Controlled by CR1.1
set by SOP register
Command
set by CR1 register