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PDF XE2420 Data sheet ( Hoja de datos )

Número de pieza XE2420
Descripción 2400 BPS Surface-Mountable Integrated Sealed-Hybrid Modem
Fabricantes ETC 
Logotipo ETC Logotipo



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No Preview Available ! XE2420 Hoja de datos, Descripción, Manual

XE2420
March 2002
2400 BPS Surface-Mountable Integrated Sealed-Hybrid Modem
Description
Xecom’s XE2420 provides a complete 2400 BPS
modem into an inexpensive miniature, surface-mount
package. Xecom’s new HyPLCC™ package (Hybrid
PLCC) makes it possible to meet the conflicting goals
of small size, low cost and surface-mountability. The
XE2420 targets remote monitoring applications in
industrial, commercial and residential locations
As a complete modem, the XE2420 includes not only
all modem circuitry but also user transferrable FCC
Part 68 Registration and UL60950 recognition. This
allows the XE2420 to be safely integrated into your
embedded application.
Xecom’s new HyPLCC™ package infuses the XE2420
with both its small size and surface mountability. The
HyPLCC package allows complex hybrid circuits to fit
the 68-Pin PLCC footprint. The HyPLCC™ package
provides a completely sealed enviroment protecting
the XE2420 during assembly and board cleaning
operations.
Features
* Small Size: The HyPLCC™ measures less than 1
inch by 1inch square and 0.290 inches thick
* Surface-mountabile: The HyPLCC™ package is
equivalent to a 68-Pin PLCC device.
* Data transfer at 2400, 1200 and 300 BPS using
V.22bis, V.22, V.23, V.21, Bell 202, Bell 212A, and
Bell 103 Protocols
* Modem Control and Configuration via industry
standard AT Commands.
* Supports external shared line features permitting
unobtrusive sharing of a local telephone line.
* Complete integrated DAA includes, Ring Detect,
Loop Current Holding Circuit, Hook Switch. Metalic
Surge Protection, and Telephone Line Transformer
* User Transferrable FCC Part 68 Registration
* UL60950 Recognition
* Low Power operation, 330 milliWatt; Power down
operation less than 1 microWatt
XE2420 BLOCK DIAGRAM
XECOM (1) XE2420

1 page




XE2420 pdf
XE2420 Pin Descriptions (continued)
PIN NAME DESCRIPTION
19 HI3
HI3 is one of the four hardware hooks for connecting shared line features to the XE2420.
HI3 interfaces to the 911 Interrupt circuit. This circuit detects changes in the loop current
when an extension handset is lifted as when making an emergency call. The system host
should immediately abort the modem connection to permit the user to complete their call.
See the Application Note on Page 10 of this data sheet to see how these line monitoring
circuits interface with the XE2420.
20 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.
21 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.
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 XE2420 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.
The telephone company places a DC “Battery” voltage across Tip and Ring on all public switched
telephone lines. The XE2420 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.
XECOM (5) XE2420

5 Page





XE2420 arduino
XE2420 AT Commands
The XE2420 uses "AT" commands for configuration and
control. This section describes use of the AT command
format and lists the AT commands, Registers and Result
codes. XE2420 "AT" commands have two operational
modes; Command Mode and Data Mode.
Command Buffer - No more than 36 characters,
including the AT prefix, may be loaded into the com-
mand buffer. If the command buffer overflows, the
modem issues an "ERROR" result code and commands
are not executed.
Data Mode: The XE2420 enters data mode after it
connects with a remote modem and issues the appropri-
ate result code. In the Data Mode the modem sends all
data presented on Transmit Data (/TXD) to the remote
modem and puts data from the remote modem onto
Received Data (/RXD). When the modem exits data
mode, it issues a "NO CARRIER" result code.
Command Mode: The XE2420 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
Command lines issued to the modem follow a strict
format. Each command begins with the prefix AT. The
command line is stored in the command buffer and
executed upon receipt of a carriage return. Until
executed, the command line can be edited with the
backspace key.
Command Prefix - Each command, except the A/
command, begins with the AT prefix. The "A" and "T"
may be either both upper case or both lower case but
cannot be of different cases. The prefix identifies the
speed and parity of the commands sent to the modem by
the host. Speed is determined by measuring the width of
the incoming bits. Parity is determined by comparing the
parity bit of the "A" and the "T."
Command Line - Commands may be strung together in
a single command line of up to 36 characters. Com-
mands are executed in the sequence they appear. Spaces
may be inserted into the command line but do not fill
space in the command buffer. A carriage return termi-
nates the command line and causes the commands to be
executed. Register S3 allows the user to select a
character other than a carriage return to terminate the
command line.
Command Line Editing - The backspace edits a
command line before it is executed. The backspace key,
(Control and H simultaneously on some systems), erases
the previous character in the command line. Register S5
allows the user to select a character other than a back-
space to edit 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 pa-
rameter 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
maybe entered while in data mode to switch the modem
into command mode while on line. The escape charac-
ter, set by Register S2, must be entered 3 times in
succession to execute the escape. An AT command must
then be enterred within the period defined by S12 to
enter the command mode. The default escape sequence
is "+++."
Result Codes - The modem issues a result code after
each action. Result codes may be provided 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
preceed and follow each result code.
XECOM (11) XE2420

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