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PDF STLC3085 Data sheet ( Hoja de datos )
| Número de pieza | STLC3085 | |
| Descripción | Integrated Pots Interface for Home Access Gateway and WLL | |
| Fabricantes | ST Microelectronics | |
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STLC3085
Integrated Pots Interface
for Home Access Gateway and WLL
Preliminary Data
Features
■ Monochip SLIC optimised for WLL & VoIP
applications
■ Implement all key features of the borsht
function
■ Single supply (4.5 to 12V)
■ Built in DC/DC Converter controller
■ Soft battery reversal with programmable
transition time
■ On-hook transmission
■ Programmable off-hook detector threshold
■ Integrated ringing
■ Integrated ring trip
■ Parallel control interface (3.3V logic level)
■ Programmable constant current feed
■ Surface mount package
■ Integrated thermal protection
■ Dual gain value option
■ Automatic recognition flyback and buckboost
configuration
■ BCDIIIS 90V technology
■ -40 to +85°C operating range
Description
The STLC3085 is a SLIC device specifically
designed for WLL (Wireless Local Loop), and
ISDN Terminal Adaptors and VoIP applications.
One of the distinctive characteristic of this device
TQFP44
is the ability to operate with a single supply
voltage (from +4.5V to +12V) and self generate
the negative battery by means of an on chip DC/
DC converter controller that drives an external
MOS switch.
The battery level is properly adjusted depending
on the operating mode. A useful characteristic for
these applications is the integrated ringing
generator.
The control interface is a parallel type with open
drain output and 3.3V logic levels. Constant
current feed can be set from 20mA to 25mA.
Off-hook detection threshold is programmable
from 5mA to 9mA.
The device, developed in BCDIIIS technology
(90V process), operates in the extended
temperature range and integrates a thermal
protection that sets the device in power down
when Tj exceeds 140°C..
Order codes
Part number
E-STLC3085 (*)
Temp range, °C
-40 to 85
Package
TQFP44
Packing
Tube
(*) ECOPACK® (see Section 5)
February 2006
Rev 1
1/28
www.st.com
28
1 page  
STLC3085
Block diagram and pin description
Table 1.
N°
26
27
28
29
30
31
32
33
34
35
36
37
41
43
44
Pin description (continued)
Pin Function
VPOS Positive supply input.
CVCC Internal positive voltage supply filter.
AGND
RLIM
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.
IREF
Internal bias current setting pin. RREF should be connected close to this pin and AGND
pin to avoid noise injection.
RTH
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 Battery supply filter capacitor.
BGND Battery Ground, must be shorted with AGND.
VBAT
Regulated battery voltage self generated by the device via DC/DC converter.
Must be shorted to VBAT1.
RING 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. A 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.
1.4
Thermal data
Table 2. Thermal data
Symbol
Parameter
Rth j-amb Thermal Resistance Junction to Ambient
Typ.
Value
60
Unit
°C/W
5/28
5 Page 
STLC3085
3 Functional description
Functional description
The STLC3085 is a device specifically developed for WLL VoIP and ISDN-TA applications.
It is based on a SLIC core, on purpose optimised for these applications, with the addition of a
DC/DC converter controller to fulfil the WLL and ISDN-TA design requirements.
The SLIC performs the standard feeding, signalling and transmission functions.
It can be set in three different operating modes via the D0, D1, D2 pins of the control logic
interface (0 to 3.3V logic levels). The loop status is carried out on the DET pin (active low).
The DET pin is an open drain output to allow easy interfacing with both 3.3V and 5V logic
levels.
The four possible SLIC’s operating modes are:
● Power Down
● High Impedance Feeding (HI-Z)
● Active
● Ringing
Table 6 shows how to set the different SLIC operating modes.
Table 6. SLIC operating modes.
PD D0 D1 D2
Operating Mode
0 0 0 X Power Down
1 0 0 X H.I. Feeding (HI-Z)
1 0 1 0 Active Normal Polarity
1 0 1 1 Active Reverse Polarity
Not used
Not used
1 1 0 0/1 Ring (D2 bit toggles @ fring)
3.1 DC/DC converter
The DC/DC converter controller is driving an external power MOS transistor N-Ch plus
transformer (Flyback configuration) or P-Ch plus inductor (BuckBoost configuration), 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.) or with an
internal clock generated when the pin CLK is connected to CVCC. One Rsense in series to
PGND supply (FlyBack) or to VPOS supply (BuckBoost) 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). Typ. value of 130mΩ guarantees an average current consumption from
Vpos < 600mA for BuckBoost configuration and < 1.25A for Fly- Back configuration.
11/28
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| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet STLC3085.PDF ] | |
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