XECOM
(1)
XE0055CS2
XE0055CS2
9/99
Miniature Telephone Line Interface Module for CTI Applications
Description
The XE0055CS2 is an extremely compact, high-perfor-
mance telephone interface module. The XE0055CS2
meets the technical requirements for V.34bis operation
yet fills less than one quarter cubic inch of space. The
XE0055CS2 complies with FCC Part 68 Rules simpli-
fying certification of the completed system.
The XE0055CS2 is a low power design operating from
a single +5 volt power supply. As with all Xecom tele-
phone interface modules, internal ring indication and
switch hook are provided to establish the telephone line
connection.
The XE0055CS2 also includes advanced features for
Computer Telephone Integration (CTI) applications.
The XE0055CS2 incorporates Caller ID access and a
continuous Connect Detect monitor. Connect Detect
reports the current availability of the local telephone
line. With these features the host can screen incoming
calls and intiate outgoing calls only when the line is
available.
Features
* Small Size: 2.0" long by 0.5" wide by 0.27" thick;
* V.34bis compatible for data transfer at speeds up to
33,600 bps;
* FCC Part 68 Compliant;
* Integrated Ring Detect Circuit;
* Provides an on-hook signal path for monitoring the
Caller ID Signal
* Integrated Connect Detect circuit continually monitors
the availbility of the local telephone line
* Single 5 Volt Power Supply
* Integrated Solid-State Switch Hook
* Provides a 1500 volt isolation barrier between the
Telephone Line and all other circuits
XE0055CS2 Block Diagram
Caller ID
Pass-Through
Line
Loop Current
Transforner
Holding Circuit
Hookswitch
Ring
Detector
T1
T2
Tip
Ring
OH
\RI
CD
Connect
Detect
XECOM
(2)
XE0055CS2
XE0055CS2 Mechanical Specifications
C
A
B
D
D
E
F
G
J
I
H
Pin Size: 0.025" by 0.025"
Recommended hole size: 0.056"
Inches
Millimeters
Dim
Min
Max
Min
Max
A
0.290 0.310
7.37
7.87
B
0.490 0.510
12.45 12.95
C
1.990 2.010
50.55 51.05
D
0.040 0.060
1.02
1.52
E
1.390 1.410
35.31 35.81
F
0.090 0.110
2.29
2.79
G
0.790 0.810
20.07 20.57
H
0.125 0.200
3.18
5.08
I
0.022 0.028
0.56
0.71
J
0.490 0.510
12.45 12.95
ABSOLUTE MAXIMUM RATINGS
Storage Temperature
-25
O
C to +85
O
C
Operating Temperature Range
0
O
C to +70
O
C
Maximum Lead Temperature
260
O
C
(soldering 2 seconds per wave)
Note: The XE0204 is available with an extended operating temperature range of -40C to +85C. To specify the
version with the extended operating temperature range order XE0204-ITR.
XECOM
(3)
XE0055CS2
XE0055CS2 Pin Configuration
1
2
3
4
5
6
7
8
9
o
o
o
o
o
o
o
o
o
Ring Tip
OH
T1 Gnd Vcc
T2
/RI
CD
Pin
Name
Description
XE0055CS2 Pin Descriptions
1
Ring
Ring is one of two signals which form the telephone network connection (RJ11 Pin
4). This device is not sensitive to the polarity of the battery voltage on the telephone
line. Ring has 1500 volts isolation from the rest of the circuitry. This isolation must
be preserved throughout the system.
2
Tip
Tip provides the second connection to the telephone network (RJ11 Pin 3). Tip has
1500 volts isolation from the rest of the circuitry. This isolation must be preserved
throughout the system.
3
OH
Hook-switch relay control input. A high on OH closes the internal relay and con-
nects the equipment to the telephone line.
4
T1
T1 connects directly to the secondary side of the XE0055CS2 telephone line trans-
former.
5
GND
This pin is used as common reference for all of the control signals in the
XE0055CS2. Signals on T1 and T2 are not referenced to ground.
6
VCC
VCC provides the power source for the hook-switch control. The XE0055CS2 will
operate with VCC equal to either 3.3 or 5 volts
7
T2
T2 connects directly to the secondary side of the telephone line transformer of the
XE0055CS2
8
/RI
Ring Indicate, output, active low, TTL, RI provides a half-wave representation of the
Ring appearing on the telephone line. An external pull-up resistor is required to cor-
rectly bias the ring indicate output.
9
CD
The Connect Detect output indicates the status of the local telephone line. A high on
CD indicates that the local telephone line is connected and is not currently in use. A
low on CD indicates that the local telephone line is either disconnected from the
XE0055CS2 or is being used by some other telephone equipment.
XE0055CS2
XECOM
(4)
XE0055CS2
XE0055CS2 Electrical Specification
(Vcc=+5v 10%, Ta=0 to 70 deg C)
Power Supply Current
Off Hook, 5.0 Volts
10
15
mA
Transmit Insertion loss
600 Ohm Impedence, 1000 Hz
1.7
2.7
3.7
dB
Receive Insertion loss
600 Ohm Impedance, 1000 Hz
1.7
2.7
3.7
dB
Line Impedance
At 1000 Hz, Rm 340 ohms
540
600
660
Ohms
Coupler Match Input
Input impedance to T1 & T2
386
390
394
Ohms
impedance
Ring Detect Sensitivity
Min. AC voltage between Tip & Ring
38
150
Vrms
Type B ringer
Ring Detect Peak Current
Ringing Voltage of 40 Vrms applied across
100
uA
Tip and Ring
Ring Detect Idle Current
No Ringing Voltage present
10
uA
Ring Indicate Output
Ring Voltage present on Tip and Ring
0.2
0.5
Volts
Hook Switch Control
ON: (off-hook)
2.0
3.0
Volts
Voltage
OFF: (on-hook)
0.2
0.5
Volts
Hook Switch Control
Off-Hook
15
25
mA
Current
Loop Current
Off-Hook current draw from the
20
100
mA
Telephone Line
Total Harmonic Distortion
At 1800 Hz, -9 dBm signal level
-72
-76
dBm
Parameter
Conditions
Min
Typ
Max
Units
XECOM
(5)
XE0055CS2
XE0055CS2 Typical Connection Diagram
o
o
o
o
o
o
o
o
o
Pin 1 Ring
Pin 2 Tip
Pin 3 OH
Pin 4 T1
Pin 5 Gnd
Pin 6 VCC
Pin 7 T2
Pin 8 /RI
Pin 9 CD
10 ohms
RV1
FB1
FB1
C1
C2
RJ11
XE0055CS2
To Embedded System Host
OH
TXA1
VC
RXA
TXA2
RINGD
RC144D
340 ohms
10k ohms
+5 Volts
10 ohms
Notes:
FB1 and FB2 are ferrite beads. They work in conjunction with Capacitors C1 and C2 to eliminate EMI from the
telephone cable. Xecom recommends a TDK CB30-1812 surface mount ferrite bead because it provides over 100
ohms impedance at 100 MHz.
C1 and C2 ground any EMI signal present on Tip and Ring. Xecom recommends a Sprague 30GAT47 capacitor.
This is a 470 pFd capacitor rated for 3000 Volts. The high voltage rating is required to maintian the required
isolation barrier between the telephone line and ground.
RV1 is a solid-state protection device to reduce the likelihood of damage due to lightning strikes. RV1 works in
conjunction with the two 10 ohm resistors to protect the XE0055CS2 circuitry. Xecom recommends the Teccor
P3100 Sidactor for this function. Its typical breakover voltage of 310 volts prevents the XE0055CS2 from being
exposed to voltage surges while being rated high enough to prevent being triggered by an incoming Ring signal.
56k ohms
PDF 
ZIP