pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 108

• Manufacturer Part Number: pef22504
• Description: Quad E1/t1/j1 Line Interface Component For Long- And Short-haul Applications Pef 22504 E, Pef 22504 Ht, Version 2.1
• Manufacturer: Infineon Technologies Corporation

Table 32
R
( )
2
7.5
2
7.5
--
2
7.5
1) The values in this row refers to an ideal application without any parasitics. Any other parasitic resistances have to be taken
3.9.7
The transmit line monitor (see principle in
on-chip transmit line current limiter. The monitor detects faults on the primary side of the transformer indicated by
a highly increased transmit line current (more than 120 mA for at least 3 consecutive pulses sourced by VDDX)
and protects the device from damage by setting the transmit line driver XL1/2 into high-impedance state
automatically (if enabled by XPM2.DAXLT = ´0´, see XPM2). The current limiter checks the actual current value
of XL1/2 and if the transmit line current drops below the detection limit the high-impedance state is cleared.
Two conditions are detected by the monitor:
•
•
In both cases a transmit line monitor status change interrupt is provided.
Shorts between XL1 or XL2 and V
Note that shorts between XL1 and XL2 cannot be detected. This way a short between XL1 and XL2 will not harm
the device.
Figure 41
Data Sheet
1)
SER
into account when calculating the final value of the output serial resistors.
Transmit line ones density (more than 31 consecutive zeros) indicated by LSR1.XLO (LSR1).
Transmit line high current indicated by LSR1.XLS.
( )
120
120
75
75
Reset values
DCIM
Mode
DCIM
mode
Z
0
Recommended Pulse Shaper Programming for E1 with registers TXP(16:1)
Transmit Line Monitor
Transmit Line Monitor Configuration
Generic
Non generic 63
Generic
Non generic 60
Generic
Non generic 28
Transmit
Interface
Mode
Line
TXP values, decimal
1
42
42
56
20
DD
, V
2
40
57
40
58
56
20
28
DDC
3
40
57
40
58
56
20
28
Figure
XL1
XL2
or V
4
40
57
40
58
56
20
28
DDP
41) compares the transmit line current on XL1 and XL2 with an
are not detected.
5
40
57
40
58
56
20
28
108
Monitor
Line
6
40
57
40
58
56
20
28
TRI
7
40
57
40
58
56
20
28
8
42
57
40
58
56
20
28
Shaper
Pulse
9
0
-4
0
0
0
-20 -20 -20 -20 -20 -20 -20 -20
-28 -28 -28 -28 -28 -28 -28 -28
10
0
0
0
0
0
XDATA
ITS10936
11
0
0
0
0
0
12
0
0
0
0
0
Functional Description
Rev. 1.3, 2006-01-25
13
0
0
0
0
0
14
0
0
0
0
0
QuadLIU
PEF 22504
15
0
0
0
0
0
16
0
0
0
0
0
TM