Preliminary
XE2400G
November 2007
World’s Smallest Global V.22 Modem
Description
Features
The Xecom XE2400G is a complete, global modem in a
Small Size: HyPLCC™ measures less than 1 inch by 1
PLCC-68 compatible package. Xecom designed the
inch and is just 0.29 inches thick
XE2400G to supply embedded applications with an easy
Data transfer at rates from 300 bps to 2400 bps
to integrate dial-up communications solution.
Modem Control and Configuration via industry
Xecom includes transferable FCC Part 68 Registration to
standard AT Commands.
XE2400G users. This allows the embedded system
3.3 and 5 volt compatible Serial Interface
designer to add modem communications to his process
control, remote monitoring, point-of-sale, or remote
Supports V.42 and MNP error correction
diagnostic system without adding FCC testing.
Shared Line Features prevent modem operation from
interfering with voice communications.
Only Xecom offers a family of surface-mount, modular
modems. The XE2400G package is the smallest
Nonvolatile memory stores modem configuration.
complete modem. Xecom also offers a pin compatible
Complete integrated DAA.
module supporting both V.92 data and V.17 fax transfer
User Transferrable FCC Part 68 Registration
the XE5617G.This provides the flexibility to switch
Modem Modules to meet changing market requirements.
Complies with telephone networks around the world.
UL60950compliant
Models
3.3 Volt Power operation;
XE2400G BLOCK DIAGRAM
XECOM
(1)
XE2400G
XE2400G Mechanical Specifications
b
c
a
d
i
i
g
f
(TOP)
e
e
c
.050”
45 O
i
Inches
Millimeters
Dimension
Min
Typ
Max
Min
Typ
Max
a
0.280
0.285
0.290
7.11
7.24
7.37
b
0.985
0.990
0.995
25.02
25.15
25.27
c
0.950
0.955
0.960
24.13
24.26
24.38
d
0.910
0.920
0.930
23.11
23.37
23.62
e
0.045
0.050
0.055
1.15
1.27
1.40
f
0.695
0.700
0.705
17.65
17.78
17.91
g
0.195
0.200
0.205
10.03
10.16
10.29
i(radius)
0.015
0.020
0.025
0.13
0.25
0.38
XECOM
(2)
XE2400G
XE2400G Pin Configuration
Pin Descriptions
PIN NAME
DESCRIPTION
1
/DCD
/DCD is an active low output from the modem. This activity on /DCD is controlled by theAT&C
command. In the default state. AT&C1, /DCD indicates the presence of a valid carrier signal.
2
/CTS
/CTS is an active low output from the modem. When hardware flow control is active, the modem
asserts /CTS to indicate that it can accept data from the terminal equipment on /TXD.
3
/RESET
/RESET is an active low input which initiates a modem hardware reset. /RESET must be active for
a minimum of 100 milliseconds for a proper modem reset sequence. No external reset is required;
if none is used the /RESET signal should be left open.
4
/DSR
/DSR is active low output from the modem. The /DSR signal typically indicates that the modem
has established a communications link. TheAT&S command determines the activity on /DSR..
5
/RTS
/RTS is an active low input to the modem. When hardware flow control is active, /RTS indicates
to the modem that the host has data to send.
6
/DTR
/DTR is an active low input to the modem and is controlled by theAT&D command. The default
setting, AT&D2, causes the modem to interpret the activation of /DTR as an indication that the
host equipment is ready to communicate. If /DTR is deactivated while the modem is on-line, the
modem will immediately disconnect and enter command mode.
7
/RXD
/RXD provides the path for received data and modem responses to be sent from the modem to
the host terminal equipment.
XECOM
(3)
XE2400G
XE2400G Pin Descriptions (continued)
PIN
NAME
DESCRIPTION
8
/TXD
/TXD provides the path for transmitted data and modem commands to be passed from the host
terminal equipment to the modem.
9
/RI
The /RI signal reports on the presence of an incoming ring signal. When a ring occurs across
Tip and Ring, the /RI output goes low and toggles with the cadence of the ring signal.
10
Ground
Ground provides the reference voltage for all host interface signals.
11
SPKR
SPKR allows connection of a speaker to monitor modem operations. SPKR cannot directly drive
a speaker. An amplifier with a minimum input impedance of 300 ohms is required. The signal on
SPKR is controlled by theATM command.
12,13
N/C
No internal connection
14
VCC
VCC provides 3.3 volt power to the modem.
15
N/C
No internal connection
16-19
NP
No Pin
20-21
N/C
No internal connection
22
Tip
The Ring and Tip signals provide modem the connection to the telephone line. FCC Part 68
Rules require a 1500 volt isolation barrier between the telephone line and all other circuits. This
isolation must be preserved throughout the system.
The telephone company places a DC “Battery” voltage across Tip and Ring on all public switched
telephone lines. The XE2400G will operate regardless of the polarity of this “Battery” voltage.
The “Battery” voltage drives up to 100 milliamps of DC loop current.
UL60950 requires minimum creepage and clearances distances be maintained between the Tip
and Ring traces and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive surfaces along the surface
23
N/C
No internal connection, To prevent damage in case of voltage surges on the telephone line, we
recommend that nothing be connected to this pin.
24
Ring
The Ring and Tip signals provide modem the connection to the telephone line. FCC Part 68
Rules require a 1500 volt isolation barrier between the telephone line and all other circuits. This
isolation must be preserved throughout the system.
UL60950 requires minimum creepage and clearances distances be maintained between the Tip
and Ring traces and all other circuits. Clearance is the shortest distance between conductive
NOTE: Although the XE2400G is a 3.3 volt device all serial inputs are 5 volt tolerant.
XECOM
(4)
XE2400G
XE2400G Soldering Instructions
The XE2400G is subject to damage if overexposed to heat during solder reflow operations. Following the soldering
instructions below will ensure that the process of soldering the module to the board does not damage the modem.
The XE2400G must not be exposed to direct Infrared (IR) heating. If your process includes direct IR heating, you
must shield the XE2400G from the infrared rays.
MaximumTemperature
220 O C
MaximumTimeat220 O C
20 Seconds
Maximum Time above Eutectic (180 O C)
90 Seconds
MaximumPreheatDwellTime
180 Seconds
Maximum Recommended Solder Temperature Profile
220 O C
180 O C
150 O C
-20 sec-
------------------------------180secmax-------------------------
max
----- 90 sec max -----
XECOM
(5)
XE2400G
XE2400G Electrical Specifications
Parameter
Min
Typ
Max
Units
Comments
VCC
3.0
3.3
3.6
Volts
ICC
80
85
ma
On Line
Ring Voltage Detected
26
150
VRMS
Type B Ringer
Ring Frequency Detected
15
68
Hz
Type B Ringer
Telephone Loop Current
16
40
120
ma
Line Impedance
600
Ohms
Data Transmit level
-12.0
-9.0
dBm
DTMF Transmit Level
-2.5
0
dBm
Avg over 3 second interval
Voh
2.4
5.0
Volts
Vol
0.4
Volts
Vih
2.0
5.0
Volts
Vil
-0.3
0.8
Volts
XE2400G ABSOLUTE MAXIMUM RATINGS
VCC
4.1Volts
Storage Temperature
-25 O C to +85 O C
1 Maximum OperatingTemperature Range
0 O C to +70 O C
MaximumTimeAbove Eutectic (183 O C)
90 seconds
Preheat Dwell Time
120 to 180 seconds
1 The XE2400G can be ordered with an Operating Temperature of -40 O C to +85 O C at extra cost. Order
XE2400G-ITR or to specify Industrial Temperature Range (ITR).
XECOM
(6)
XE2400G
XE2400G Typical Connection Diagram
Parts List for XE2400G Typical Connection Diagram
Reference
Designation
Qty
Description
C1,C2
2
Cap.680pfd,Y2
F1
1
PTC,TRF600-150
Notes:
1
Capacitors, C1 and C2, may be required for EMI filtering in your system. Without these components you may
experience unintended radiation when the telephone cable is attached. C1 and C2 are high-voltage capacitors.
We recommend the Novocap ES2211N681K502NXTM.. This 680 pfd, 5000 volt capacitor will direct the high
frequency harmonics to the system ground.
3. F1 is a positive thermal coefficient (PTC) device which protects the modem from excessive current flow. These
devices are required for your system to pass UL60950. Fuses may be used in place of the PTC’s
XECOM
(7)
XE2400G
Application Note: Using a 68-Pin PLCC Socket
The XE2400G can be inserted into a socket for a 68-pin PLCC device. The HyPLCC package uses only 20 pins; 15
on one side and 5 on the opposite side. Alignment within the socket is critical for all pins of the XE2400G to make
contact with the appropriate pins of the PLCC socket. The drawing below illustrates how the XE2400G fits into the
68-pin PLCC socket. Emulation Technology’s S-SMT-17-068-A socket is representative of sockets that can be used
withtheXE2400G.
60
44
61
XE2400G
43
1
2
3
4
24
5
23
6
22
7
21
1
8
20
9
19
10
18
11
17
12
16
13
14
15
9
27
10
26
XECOM
(8)
XE2400G
XE2400G Connection Data
The XE2400G reports data on the current connection in response to the ATI11 command. Because many
of the reported parameters require an active connection, this command is best utilized from the on-line
command mode accessed with the escape sequence. The items shown in italics are only valid during an
active call.
The Connection Report is presented in two pages. The first page will be displayed on receipt of the ATI11
command. To move to the second page of the report hit any key. The table below describes the
information provided in the Connection Report.
REPORTED ITEM
DESCRIPTION
1 Last Connection
Not Used
2 Initial Transmit Carrier Rate
Upstream data rate first negotiated on last connection
3 Initial Receive Carrier Rate
Downstream data rate first negotiated on last connection
4 Final Transmit Carrier Rate
Upstream data rate at the end of the last connection
5 Final Receive Carrier Rate
Downstream data rate at the end of the last connection
6 Protocol Negotiation Result
Reports the error correction protocol negotiated on last connection; values
include LAPM/SREC, LAPM, MNP, and none.
7 Data Compression Result
Reports Link data compression protocol negotiated on last connection; values
include LAPM, MNP, V.42bis, V.44 and none.
8 Noise Level
Reports the estimated noise level in the modem signal.
9 Receive Signal Power Level
Reports the approximate level of the incoming modem signal.
10 Transmit Signal Power Level Reports the level of the outgoing modem signal.
11 Round Trip Delay
Reports how many milliseconds for the signal to be transmitted and returned.
12 Near Echo level
Not Used
13 Far Echo Level
Not Used
14 Transmit Frame Count
Reports the total number of LAPM frames transmitted thus far during the call.
15 Transmit Frame Error Count Reports the number of transmitted frames rejected during the current call.
16 Receive Frame Count
Reports the total number of LAPM frames received thus far during the call.
17 Transmit Frame Error Count Reports the number of received frames rejected during the current call.
18 Retrain by Local Modem
Reports the number of retrain and rate renegotiations requested by the local modem.
19 Retrain by Remote Modem
Reports the number of retrain and rate renegotiations requested by the remote modem.
20 Local Rate Renegotiation
Reports the number of rate renegotiations requested by the local modem.
21 Remote Rate Renegotiation
Reports the number of rate renegotiations requested by the remote modem.
22 Call Termination Cause
Reports the reason for termination of the last call; 0 indicates disconnect by local
modem command, 1 indicates loss of received modem carrier, 2 indicates a failed
call attempt, and 4 indicates a protocol failure.
23 Not Used
24 Not Used
25 Not Used
26 Not Used
XECOM
(9)
XE2400G
XE2400G AT Commands
The XE2400 uses "AT" commands for configuration
If the command buffer overflows, the modem
and control. This section describes theAT command
issues an "ERROR" result code, and the
format and lists the commands, registers and result
command line is not executed. Register S3 allows
codes.
the user to select a character other than a carriage
return to terminate the command line.
Command Mode: The XE2400G enters command
mode on power-up, reset, a lost connection, or
Re-Execute
Last
Command
-
The
A/
receipt of the escape code. In command mode the
command causes the modem to re-execute the
modem accepts commands from the host on
last command line. This is the only command
transmit data. Appropriate result codes are returned
which does not require the "AT" prefix.
on received data.
Note: For backward compatibility some functions
Omitted Parameters - Most commands include
are controlled by more than one command. In these
a parameter which determines how the functions
instances the last command issued determines the
will be set. When the command parameter is
function setting.
omitted from the command string, it is assumed to
be a 0.
Command Line Format
AT commands follow a strict format.
Each
Escape Characters - A 3 character escape
command line, except A/, begins with the prefix
sequence may be entered to switch the modem
AT. The "A" and "T" may be both upper case or
into command mode while on line. The escape
both lower case but cannot be of different cases.
character, set by Register S2, must be entered 3
The modem determines data rate of the host
times in succession to execute the escape. An AT
equipment by measuring the width of the incoming
command must then be entered within the period
bits of the “A” and “T.”
defined by S12 to enter command mode. The
default escape sequence is "+++."
Multiple commands may be combined into a single
command line of up to 40 characters. Commands
Result Codes - The modem issues a result code
are executed in the sequence they appear upon
after each action. Result codes may be sent as
receipt of a carriage return. Spaces inserted into the
full words, one or two digit numeric codes, or may
command line are not placed in the buffer.
be disabled all together. Each result code ends
with a carriage return when numeric result codes
The command line can be edited with a backspace
are chosen. When full word result codes are
before it is executed. The backspace erases the
chosen, a Line Feed and Carriage Return precede
previous character in the command line. Register S5
and follow each result code.
allows the user to select a character other than
backspace to edit the command line.
XECOM
(10)
XE2400G
XE2400G AT Commands
An asterisk indicates the factory default
Mn - Speaker Activity - Determines when the speaker
will be active.
A - Answer Command - Causes the modem to
n=0 Speaker off
immediately go off-hook and attempt to a connection
n=1 Speaker on until carrier received *
n=2 Speaker remains on
D - Dial Command - Causes the modem to go off-hook
n=3 Speaker on until DCD active
and dial. Below are the characters accepted in the
dialing string.
Nn - Link Negotiations - Selects how Register S37 will
0-9,A-D, #, * = Dialing Digits
be used to set the link negotiations
L = Redial Last Number Dialed
n=0
Connect only at the speed selected by S37
P = Pulse dial
n=1 Begin negotiations at the selected speed
S=n = Dial number stored in location n
but allow fallback *
T = Tone dial
W = Wait for dial tone
On - On Line - Puts the modem back into data mode
, = Pause for the duration of S8
from the on-line command mode.
! = Switch hook flash
n=0 Return On Line with no retrain *
; = Return to the command state
n=1 Initiate retrain while returning On line.
En-CommandEcho - Determines it the modem returns
Qn - Responses - Determines if the modem will send
the commands received from the host.
responses to the host.
n=0 Do not echo commands
n=0 Send responses *
n=1 Enable command echo *
n=1 No Responses
Hn - Switch Hook Control - Controls the connection
Sr? - Interrogate Register - Read register value
to the telephone line.
n=0 Switch hook relay opens
Sr=n - Set Register Value - Set register value.
n=1 Switch hook relay closes
Vn - Result Codes - Sets result code type
In - Modem Identification - Provides product data..
n=0 Numeric Result Codes
n=0 Modem identity
n=1 English Word Result Codes*
n=1 ROM Checksum
n=2 Verify Checksum,
Wn - Expanded Result Codes - Adds protocol
n=3 same as n=0
messages to the modem Connect responses.
n=4 Data Pump Firmware Version
n=0 Report DTE Receive Speed
n=5 Code Version
n=1 Report DTE Speed and protocol type
n=9 Country ID
n=2 Report DCE Speed and protocol type *
n=11 Connection Data
Ln - Speaker Volume - Selects level of speaker output.
n=0,1 LowVolume
n=2 Moderate Volume *
n=3 HighVolume
XECOM
(11)
XE2400G
XE2400G AT Commands
Xn - Result Code Set - Sets modem responses
&V - View Active Configuration - Presents current
n=0 Responses 0-4
modem configuration information
n=1 Responses 0-5 & 10
n=2 Responses 0-6 & 10
&W - StoreActive Configuration - Places the current
n=3 Responses 0-5, 7 & 10
configuration into the selected memory location
n=4 Responses 0-8 & 10*
where it can be recalled on a soft reset.
n=5 All Responses
n=6 All Responses
&Zx=n - Store Number n in Location “x” - Permits
n=7
All Responses but extended result codes
placement of a telephone number in the selected
memory lo