PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 93

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
4.7
In many applications, the power dissipated on the line card is a critical parameter. In
larger systems, the mean power value (taking into account traffic statistics and line
length distribution) determines cooling requirements. Particularly in remotely fed
systems, the maximum power for a line must not exceed a given limit.
4.7.1
Generally, system power dissipation is determined mainly by the high-voltage part. The
most effective power-saving method is to limit SLIC functionality and reduce supply
voltage in line with requirements. This is achieved using different operating modes.
The three main modes – Power Down, Active and Ringing – correspond to the main
system states: on-hook, signal transmission (voice and/or TTX) and ring signal feed.
For power critical applications the Sleep mode can be used for even lower power
consumption than in Power Down mode.
– Power Down
Off-hook detection is the only function available. It is realized by 5 k
by the SLIC from Tip to
supervises the DC current through these resistors (zero in on-hook and non-zero in off-
hook state). This scaled transversal line current is transferred to the IT pin and compared
with a programmable current threshold in the SLICOFI-2x. Only the DC loop in the
SLICOFI-2x is active.
In Sleep mode, all functions of the SLICOFI-2x are switched off except for off-hook
detection which is still available via an analog comparator. Both AC and DC loops are
inactive. To achieve the lowest power consumption of the DuSLIC chip set, the clock
cycles fed to the MCLK and PCLK pins have to be shut off.
For changing into another state the DuSLIC has to be woken up according to the
procedure described in
– Active
Both AC and DC loops are operative. The SLIC provides low-impedance voltage feed to
the line. The SLIC senses, scales and separates transversal (metallic) and longitudinal
line currents. The voltages at Tip and Ring are always symmetrical with reference to half
the battery voltage (no ground reference!). An integrated switch makes it possible to
choose between two (SLIC-S/-S2, SLIC-E/-E2) or even three (SLIC-P) different battery
voltages. With these voltages selected according to certain loop lengths, power
optimized solutions can be achieved.
Data Sheet
Operating Modes and Power Management
Introduction
Chapter
V
BGND
and Ring to
4.1.
93
V
BAT
, respectively. A simple sensing circuit
Operational Description
resistors applied
2000-07-14
DuSLIC