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E-STLC3055N View Datasheet(PDF) - STMicroelectronics

Part Name
Description
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E-STLC3055N Datasheet PDF : 34 Pages
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STLC3055N
Pin description
Table 2.
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Pin description (continued)
Pin
Function
RS Protection resistors image (the image resistor is connected from this node to ZAC).
ZB
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).
CAC AC feedback input, AC/DC split capacitor (CAC).
TX
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.
VF Feedback input for DC/DC converter controller.
Power switch controller clock (typ. 125 kHz). This pin can also be connected to CVCC
CLK
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.
GATE Driver for external Power MOS transistor (P-channel).
Voltage input for current sensing. RSENSE should be connected close to this pin and
RSENSE VPOS pin. The PCB layout should minimize the extra resistance introduced by the
copper tracks.
VPOS
CVCC
Positive supply
Internal positive voltage supply filter.
AGND Analog ground, must be shorted with BGND.
RLIM
Constant current feed programming pin (via RLIM). RLIM should be connected close to
this pin and AGND pin to avoid noise injection.
IREF
RTH
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.
RD
DC feedback and ring trip input. RD should be connected close to this pin and AGND
pin to avoid noise injection.
ILTF Transversal line current image output.
CSVR
BGND
Battery supply filter capacitor.
Battery ground, must be shorted with AGND.
VBAT
RING
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).
TIP 2 wire port; TIP wire (Ia is the current sourced from this pin).
CREV
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.
VBAT1 Frame connection. Must be shorted to VBAT.
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