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STLC3065 Datenblatt(PDF) 5 Page - STMicroelectronics

Teile-Nr. STLC3065
Beschreibung  WLL SUBSCRIBER LINE INTERFACE CIRCUIT
Download  27 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLC3065 Datenblatt(HTML) 5 Page - STMicroelectronics

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The STLC3065 operating modes will be obtained
as combination of the SLIC core status and the
dual port configuration.
The DC/DC converter controller is driving an ex-
ternal power MOS transistor (P-Channel) in order
to generate the negative battery voltage needed
for device operation.
The DC/DC converter controller is synchronised
with an external CLK (125KHz typ.).
From version marked STLC3065 A5, it can be
synchronised to an internal clock generated when
the pin CLK is connected to CVCC. One sensing
resistor in series to Vpos supply allows to fix the
maximum allowed input peak current. This feature
is implemented in order to avoid overload on
Vpos supply in case of line transient (ex. ring trip
detection).
The typical value is obtained for a sensing resis-
tor equal to 110m
Ω that will guarantee an aver-
age current consumption from Vpos < 700mA.
In on-hook condition the self generated battery
voltage is set to a predefined value.
This value can be adjusted via one external resis-
tor (RF1) and it is typical -50V. When RING mode
is selected this value is increased up to -70V typ.
Once the line goes in off-hook condition the
DC/DC converter automatically adjust the gener-
ated battery voltage in order to feed the line with
a fixed DC current (programmable via RLIM) opti-
mising in this way the power dissipation.
The Dual Port allows to connect the SLIC core to
one of the two possible 2W ports (TIP1/RING1,
TIP2/RING2).
Dual port concept
One switches array integrated in STLC3065 al-
lows to connect the TIP and RING output of the
SLIC core to one of the two 2W
ports
(TIP1/RING1 or TIP2/RING2). For special condi-
tions it is also possible to connect both ports to
the SLIC core.The structure of the switches array
is shown in fig.1 and it is controlled via the two
logic inputs P1 and P2.
Depending on the switches configurations each
2W port (TIP1/RING1 or TIP2/RING2) can be set
in four possible conditions:
Open
Connected to BGND and Battery via two inte-
grated 1.5K
Ω resistors.
Connected to the SLIC core
Connected to an internal 300
µA (min.) current
source.
Depending on the SLIC core operating modes
(defined by D0,D1 and D2) only a subset of these
conditions can be programmed.
SLIC core
DC/DC converter
controller
Tip1
Ring1
Ring2
Tip2
TX
RX
CONTROL
INTERFACE
SW3T
SW5R
SW6R
SW4T
SW1T
SW1T
SW2R
SW2T
SW3R
300
µA
SW4R
300
µA
FUNCTIONAL DIAGRAM
STLC3065
5/27


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