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參數(shù)資料
| 型號(hào)： | STLC3065Q |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| 中文描述： | 環(huán)路用戶線路接口電路 |
| 文件頁(yè)數(shù)： | 8/27頁(yè) |
| 文件大?。?/td> | 194K |
| 代理商： | STLC3065Q |
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in series (see fig.2), where Rp is the externalpro-
tectionresistance.
It should be noted that in case of both ports in HI-
Z mode and both of them in off-hookcondition the
power dissipated inside the chip could drive the
device in thermal protection. This can be pre-
vented via a proper software control that should
avoid to keep as a steady condition both lines in
off-hook and HI-Z mode. Typical operation is to
set the SLIC core in active mode as soon as off-
hook is detected.
AC CHARACTERISTICS
The AC impedance shown at the 2W ports
(TIP1/RING1 and TIP2/RING2) is the same as
the DC one. Depending on the P1, P2 bits the
TIP1/RING1 and TIP2/RING2 AC impedance will
be 2x(1500
+ Rp) or high impedance.
Active
D0
D1
D2
P1
P2
DET
DET1
DET2
X
1
X
0
0
disable
disable
disable
X
1
X
1
1
off/hk
line 1+2
disable
disable
X
1
X
0
1
off/hk
line 2
disable
disable
X
1
X
1
0
off/hk
line 1
disable
disable
DC CHARACTERISTICS& SUPERVISION
When this mode is selected it is because one
connected telephone goes off-hook and the
STLC3065 is providing both DC feeding and AC
transmission.
The SLIC core is in ACTIVE mode and normally
only one of the two port should be connectedto it:
P1,P2 = (1,0) or (0,1).(seeFig.1 and Table 2).
The unselected port is anyway DC biased being
TIP wire connected to BGND via a 1600W resis-
tor and the RING wire connected to a 300mA
(min.) current source connectedto Vbat.
It should be noted that since Vbat is self gener-
ated by the STLC3065 and it is tracking the line
voltage depending on the loop resistance con-
nected to the selected port its voltage can range
typically from -12V to -50V. The unselected port
status (on/off hook) cannot be detected. For spe-
cial configurations it is also possible to set AC-
TIVE mode with both port selected(P1,P2=1,1) or
bothunselected(P1,P2=0,0).
Considering now the selected port, this is con-
nected to the SLIC core. The STLC3065 feeds
the line with a constant current fixed by RLIM
(20mA to 40mA range). The on-hook voltage is
typically 40V allowing on-hook transmission; the
selfgeneratedVbat is -52V typ.
If the loop resistance is very high and
current cannot reach the programmed constant
current feed value,the STLC3065 behaveslike a
40V voltage source with a series impedance
equalto the protectionresistors 2xRp(typ. 2x41
)
plus the line series switches (Sw1 or Sw2) on re-
sistance2xRsw (typ. 2x9
).
Fig.3 shows the typical DC characteristic in AC-
TIVE mode.
the line
The line status (on/off hook) is monitored by the
SLIC core Supervision circuit. The off-hook
threshold can be programmed
resistor RTH in the rangefrom 5mA to 9mA.
When the line goes in off-hook condition the built
in DC/DC converter controller set properly the
Vbatsupply in orderto keep the loop current fixed
to the programmedvalue.
Independently on the programmed constant cur-
rent value, the TIP and RING buffers have a cur-
rent source capabilitylimited to 70mA typ.
via the external
Vbat
IL
VL
Vbat (-50V)
Slope: 2x(R1+Rp)
(R1=1500ohm)
2x(R1+Rp)
Figure 2. DC characteristicin HI-Zmode.
IL
Ilim
VL
Vbat (-50V)
10V
2Rp+2Rsw
(100ohm typ.)
(20 to
40mA)
Figure 3. DC characteristicin ACTIVE mode
STLC3065
8/27
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