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PDF XE5690SM Data sheet ( Hoja de datos )
| Número de pieza | XE5690SM | |
| Descripción | Low-Cost Global Embedded Modem | |
| Fabricantes | Xecom | |
| Logotipo |  |
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XE5690SM
June 2005
Compact, Low-Cost Global Embedded Modem
Description
The Xecom XE5690SM provides a complete,
global modem as a compact module. Only Xecom
offers embedded modems in both through-hole and
surface-mount form.
User transferable FCC Part 68 registration comes
with every Xecom modem. This allows the system
designer to add a modem to a process control,
remote monitoring, point-of-sale, or remote
diagnostic system without Part 68 certification.
The XE5690SM footprint is 20% smaller than the
most popular embedded modems. The surface-
mount version frees additional space on the bottom
of the application board. The space efficient design
allows the development engineer greater flexibility
in placement of the modem within the host system.
Xecom offers two interchangeable models: The
XE2422SM offers low speed connectivity at low
cost; the XE5692SM permits fast V.92
connections.
Features
• Models - XE5690SM (Through-Hole Model)
XE5690SM-1 (Surface-Mount Model)
• Size: XE5690SM: 2.175” x 1.0” x 0.30”
XE5690SM-1: 2.175” x 1.0” x 0.152”
• Data transfer at rates from 300 bps to 56 Kbps
• Control & configuration via AT commands.
• 3.3 and 5 volt compatible serial interface
• V.42 error control and V.42bis data compression.
• Shared line features prevent modem operation
from interfering with voice communications.
• Boot command automatically loads user default
configuration.
• Complete integrated DAA.
• User transferrable FCC Part 68 registration
• World-wide telephone networks compliance.
• UL60950 Recognition
• Low Power operation, 3.3 Volts, 100 milliwatts;
XE5690SM BLOCK DIAGRAM
/Reset
/TXD
/RXD
/RTS
/DSR
/DCD
/CTS
/DTR
/INT
SPKR
/RI
Modem
Controller
NVRAM
ROM
Analog
Front
End
Global
Telephone
Line
Interface
(DAA)
Tip
Ring
XECOM
(1) XE5690SM
1 page  
XE5690SM Pin Descriptions (continued)
PIN NAME DESCRIPTION
3 /INT
4 /RESET
5 SPKR
6 Ground
7 /RI
8 /DTR
9 /TXD
10 /RXD
11 /RTS
12 /DSR
13 /CTS
14 /DCD
15 VCC
UL60950 requires minimum creepage and clearances distances between the Tip and
Ring and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive points along the surface.
/INT provides an active low hardware interrupt signal from the XE5690SM. The
operation of this interrupt pin is programmable using the modem’s register U70.
/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.
SPKR provides a Pulse Width Modulated version of the signal on Tip and Ring
allowing connection of a speaker to the modem to monitor modem operations. The
recommended speaker circuit is shown on Page 9 of this data sheet. The signal on
SPKR is controlled by the ATL and ATM commands.
Ground provides the reference voltage for all host interface signals.
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.
/DTR is an active low input to the modem. An active /DTR signals the terminal is
available for communications. The AT&D command determines how the modem
interprets activity on /DTR.
/TXD provides the path for transmitted data and modem commands to be passed
from the host controller to the modem.
/RXD provides the path for received data and modem responses to be sent from the
modem to the host controller.
/RTS is an active low input to the modem. When hardware flow control is set, an
active /RTS indicates to the modem that the host has data to send.
/DSR is an active low output from the modem and is forced to the active condition.
/CTS is an active low output from the modem. When hardware flow control is set,
the modem asserts /CTS to indicate that it can accept data from the terminal equip-
ment on /TXD.
/DCD is an active low output from the modem. An active /DCD indicates the
presence of a valid carrier signal. The AT&C command controls when the
XE5690SM asserts /DCD.
VCC provides 3.3 volt power to the modem.
XECOM
(5) XE5690SM
5 Page 
XE5690SM AT Commands
The XE5690SM uses "AT" commands for
configuration and control. This section describes
the AT command format and lists the commands,
registers and result codes.
Command Mode: The XE5690SM enters
command mode on power-up, reset, a lost
connection, or receipt of the escape code. In
command mode the modem accepts commands
from the host on transmit data. Appropriate result
codes are returned on received data.
Command Line Format
AT commands follow a strict format. Each
command line, except A/, begins with the prefix
AT. The "A" and "T" may be both upper case or
both lower case but cannot be of different cases.
The modem determines data rate of the host
equipment by measuring the width of the incoming
bits of the “A” and “T.”
Multiple commands may be combined into a single
command line of up to 48 characters. Commands
are executed in the sequence they appear upon
receipt of a carriage return. Spaces inserted into
the command line are not placed in the buffer.
The command line can be edited with a backspace
before it is executed. The backspace erases the
previous character in the command line. Register
S5 allows the user to select a character other than
backspace to edit the command line.
If the command buffer overflows, the modem
issues an "ERROR" result code, and the command
line is not executed. Register S3 allows the user to
select a character other than a carriage return to
terminate the command line.
Re-Execute Last Command - The A/ command
causes the modem to re-execute the last command
line. This is the only command which does not
require the "AT" prefix.
Omitted Parameters - Most commands include a
parameter which determines how the functions will
be set. When the command parameter is omitted
from the command string, it is assumed to be a 0.
Escape Characters - A 3 character escape
sequence may be entered to switch the modem
into command mode while on line. The escape
character, set by Register S2, must be entered 3
times in succession to execute the escape. An AT
command must then be entered within the period
defined by S12 to enter command mode. The
default escape sequence is "+++."
Result Codes - The modem issues a result code
after each action. Result codes may be sent as full
words, one or two digit numeric codes, or may be
disabled all together. Each result code ends with a
carriage return when numeric result codes are
chosen. When full word result codes are chosen, a
Line Feed and Carriage Return precede and follow
each result code.
XECOM
(11) XE5690SM
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