STLC3055N_09 STMICROELECTRONICS [STMicroelectronics], STLC3055N_09 Datasheet - Page 7

• Manufacturer Part Number: STLC3055N_09
• Description: WLL and ISDN-TA subscriber line interface circuit
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STLC3055N
Table 2.
N°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
37
41
43
44
Pin description (continued)
RSENSE
VBAT1
BGND
VPOS
CVCC
AGND
CSVR
CREV
GATE
VBAT
RING
RLIM
IREF
CAC
RTH
CLK
ILTF
Pin
TIP
RS
RD
ZB
TX
VF
Battery ground, must be shorted with AGND.
Protection resistors image (the image resistor is connected from this node to ZAC).
Balance network for 2 to 4 wire conversion (the balance impedance ZB is connected
from this node to AGND. ZA impedance is connected from this node to ZAC1).
AC feedback input, AC/DC split capacitor (CAC).
4 wire output port (TX output). The signal is referred to AGND. If connected to single
supply CODEC input it must be DC decoupled with proper capacitor.
Feedback input for DC/DC converter controller.
Power switch controller clock (typ. 125 kHz). This pin can also be connected to CVCC
or AGND. When the CLK pin is connected to CVCC an auto-oscillation is internally
generated and it is used instead of the external clock. When the CLK pin is connected
to AGND, the GATE output is disabled.
Driver for external Power MOS transistor (P-channel).
Voltage input for current sensing. RSENSE should be connected close to this pin and
VPOS pin. The PCB layout should minimize the extra resistance introduced by the
copper tracks.
Positive supply
Internal positive voltage supply filter.
Analog ground, must be shorted with BGND.
Constant current feed programming pin (via RLIM). RLIM should be connected close to
this pin and AGND pin to avoid noise injection.
Internal bias current setting pin. RREF should be connected close to this pin and
AGND pin to avoid noise injection.
Off-hook threshold programming pin (via RTH). RTH should be connected close to this
pin and AGND pin to avoid noise injection.
DC feedback and ring trip input. RD should be connected close to this pin and AGND
pin to avoid noise injection.
Transversal line current image output.
Battery supply filter capacitor.
Regulated battery voltage self generated by the device via DC/DC converter. Must be
shorted to VBAT1.
2 wire port; RING wire (Ib is the current sunk into this pin).
2 wire port; TIP wire (Ia is the current sourced from this pin).
Reverse polarity transition time control. One proper capacitor connected between this
pin and AGND is setting the reverse polarity transition time. This is the same transition
time used to shape the "trapezoidal ringing" during ringing injection.
Frame connection. Must be shorted to VBAT.
Function
Pin description
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