PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 58

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

DuSLIC
Functional Description
Preliminary
With the DuSLIC ringing voltages up to 85 Vrms sinusoidal can be applied, but also
trapezoidal ringing can be programmed.
For a detailed application diagram of internal balanced ringing refer to the chapter on
“Application Circuits” (see
Figure
97,
Page
368).
3.5.6
Internal Unbalanced Ringing with SLIC-P
The internal unbalanced ringing together with SLIC-P can be used for ringing voltages
up to 50 Vrms. The SLICOFI-2 integrated ringing generator is used and the ringing signal
is applied to either the Tip or Ring line. Ringing signal generation is the same as
described above for balanced ringing. Since only one line is used for ringing, technology
limits the ringing amplitude to about half the value of balanced ringing, to maximum
50 Vrms.
BGND
=V
V
DROP,R,BGND
DROP,T
V
T
V
DROP,T
V
DC,RING
V
/ 2
BATR
V
RING,p
v
= v
v
R
RING
R
V
DROP,R,VBATR
V
ezm140316.wmf
BATR
Figure 28
Unbalanced Ringing Signal
The above diagram shows an example with the ring line used for ringing and the Tip line
V
fixed at
which is the drop in the output buffer of the Tip line of SLIC-P (typ.
–
DROP,T
V
< 1 V). The ring line has a fixed DC voltage of
/2 used for ring trip detection.
BATR
The maximum ringing voltage is:
V
V
V
V
= (
)/2.82
–
BATR –
DROP,R,VBATR –
RING,RMS
DROP,T
When the called subscriber goes off-hook, a DC path is established from the Ring to the
Tip line. The DC current is recognized by the SLICOFI-2 because it monitors the IT pin.
An interrupt indicates ring trip if the line current exceeds the programmed threshold.
The same hardware can be used for integrated balanced or unbalanced ringing. The
balanced or unbalanced modes are configured by software. The maximum achievable
V
amplitudes depend on the values selected for
.
BATR
Data Sheet
58
2000-07-14