XECOM XE1401I, XE1401G, XE1401F, XE1401B, XE1401 Datasheet

Multi-National 14,400 BPS Embeddable Modem

XE1401

4/99

Description

Xecom's XE1401 is a complete 14,400 bps modem in a single component. It is available for use in many countries throughout the world. Xecom offers versions for North America and Japan, Germany, France, Italy, and the United Kingdom.

The XE1401 is a complete modem including the DAA. XE1401 users do not need to add RAM, ROM, Crystals, transformers, or switches to complete the modem design. The user only needs to provide the TTL level, serial interface and the telephone jack.

The XE1401 is a full-featured modem. Besides the 14,400 bps data transfer, the XE1401 supports data compression, error correction and fax transfer. The XE1401 also inlcudes NVRAM for permanent storage of the modem configuration.

The XE1401 is pin compatible with Xecom's XE2401L and XE3301 modems. This family of modems permits a simple upgrade path from 2400 bps to 33,600 bps.

Features

Models for North America, Japan, and Europe

Country Model Canada XE1401 Japan XE1401 France XE1401F Germany XE1401G Italy XE1401I UK XE1401B

USA

Small Size: 2.75 inches by 1.38" by 0.42"

UL1459 Recognized

Modem Protocols: V.32bis (14,400 bps), V.32,

V.22bis, V.22, V.21, Bell 212A and 103 Fax Protocols: V.17 (14,400 bps), V.29, V.27ter, and

V.21 channel 2 Error Correction; V.42, MNP2-4 and MNP10

Data Compression; V.42bis and MNP5 provides a

maximum effective data rate of 57,600 bps. Pin compatible with Xecom's XE2401L and XE3301

modems

(user transferable FCC Registration)

XE1401

Serial I/O

/DTR

/RTS /CTS /DSR TXD RXD

/DCD

Auxiliary I/O

RESET

/LCS

Modem

Controller

Block Diagram

ROM

NVRAM

Analog

Front

End

DAA

Tip

Ring

XECOM (1) XE1401

XE1401 Mechanical Specifications

)

Inches Metric (MM

Dim Min Max Min Max

A 2.74 2.760 69.60 70.10 B 1.370 1.390 34.80 35.31 C 0.400 0.420 10.16 10.67 D 0.890 0.910 22.61 23.11 E 1.890 1.910 48.01 48.51 F 0.125 0.200 3.18 5.08 G 0.080 0.100 2.03 2.54 H 0.415 0.435 10.54 11.05 J 0.090 0.110 2.29 2.79 K 0.020 0.025 0.51 0.64 L 0.380 0.400 9.65 10.16 M 0.090 0.110 2.29 2.79

Pins = 0.025 inch square pin All pins tin-plated

XE1401 PIN CONFIGURATION

RESET

N/C

RXD

/DTR

/LCS /CTS

TXD

/RTS

NC /RI

TIP

RING

1 2 3

9 10 11 12 13 14 15 16

40 39 38

22 21

VCC /DSR /DCD

AMP GND

XECOM (2) XE1401

XE1401 Pin Descriptions

PIN NAME DESCRIPTION

1 RESET Hardware reset pin, Input, active High, TTL. A high on Pin 1 initiates a hardware reset. An

external reset is not required or recommended. The Reset pulse must be a minimum of 100

milliseconds long. 2 N/C No Internal Connection 3 RXD Received Data, Output, TTL. Serial data output to the host. A logic "High" on RXD rep-

resents a "mark" and a logic "Low" represents a "space". 9 \DTR Data Terminal Ready, Input, active Low, TTL. The "AT&D" command sets the function of

\DTR. The default, AT&D2, requires the host to assert \DTR to permit a modem link. The

modem drops the call in progress if \DTR is revoked and will not connect until \DTR is re-

asserted.

10 \LCS Loop Current Sense, active Low Input, TTL. A low on \LCS tells the modem that loop

current is flowing through Tip and Ring. This feature is used only in the XE1401B version.

11 \CTS Clear to Send, Output, active Low, TTL/CMOS. \CTS is used as a Flow Control output

from the modem. The modem revokes \CTS with hardware flow control active to signal the

host that the modem's input buffer is full. The modem reasserts \CTS when the buffer can

accept more data without a buffer overflow.

12 OH Off-Hook, Output, active High. OH indicates the modem's hookswitch relay is closed.

Hookswitch closure connects the modem to the telephone line.

13 TXD Transmit Data, Input, TTL. Serial data input from the host. A logic "High" represents a

"mark" and a Low represents a"space", TTL.

14 \RTS Request to Send, input, active LOW, TTL. The XE1401 uses \RTS for hardware flow con-

trol. When \RTS is revoked and hardware flow control is enabled, the modem will not place

data on RXD.

15 NC No Internal Connection 16 \RI Ring Indicator, Output, active Low, TTL. When low indicates the modem is receiving a ring

signal.

18 TIP Tip connection to the phone line (RJ11 pin3) from the internal DAA. The XE1401 is not

sensitive to the battery voltage polarity across Tip and Ring.

20 RING Ring connection to the phone line (RJ11 pin4) from the internal DAA. 21 GND Ground (0 volts) 22 AMP Audio Output function is set by L & M commands and the value in register S22. This output

can drive a minimum load of 300 ohms.

XECOM (3) XE1401

XE1401 Pin Descriptions

PIN NAME DESCRIPTION

38 \DCD Data Carrier Detect, Output, active Low, TTL/CMOS. AT&C sets the \DCD function. In the

default condition, AT&C1, \DCD indicates the presence of a carrier signal on the telephone

line.

39 \DSR Data Set Ready, Output, active Low, TTL/CMOS. AT&S sets the \DSR function. In the

default condition, AT&S0, \DSR is forced true.

40 Vcc +5 Volts

ABSOLUTE MAXIMUM RATINGS*

SUPPLY VOLTAGE - Vcc +6.5 Volts

DC INPUT VOLTAGE -0.6 Volts to +6.5 Volts

STORAGE TEMPERATURE RANGE -25° C TO +85° C

LEAD TEMPERATURE (Soldering, 2 sec per wave) 260° C

OPERATING TEMPERATURE RANGE 0 TO 70° C

*Exceeding these values may result in permanent damage to the device.

XE1401 ELECTRICAL SPECIFICATIONS

Parameter Min Typ Max Units Comments

VCC 4.75 5.25 Volts ICC 100 150 1 70 mamps On Line

Ring Voltage Detected 38 150 RMS XE1401

10 RMS XE1401B, XE1401I 20 RMS XE1401G

Ring Frequency Detected 15.3 68 Hz Telephone Loop Current 10 100 mamps XE1401

10 120 mamps XE1401B, XE1401I 10 60 mamps XE1401G 10 45 mamps XE1401F

Data Transmit level -12 -10.5 -9.0 dBm DTMF Transmit Level -2.5 0 dBm Avg over 3 second interval Billing tone Filter 16 KHz XE1401G Only

XECOM (4) XE1401

XE1401 Typical Applications Schematic

16C450

UART

/DSR

/DCD

SIN

/DTR

/CTS

RXD

XE3301

XE1401

/DTR

/CTS

VCC

/DSR

/DCD

SOUT /RTS

/RI

TXD

/RTS

Tip Ring

/RI

4 3

Line

AMP

GND

50K

.2 ufd

+5 Volts

LM386

.05 ufd

10 ohms

Note: RJ11 Pin assignments reflect a 6-pin connector. Tip and Ring are always the center pins of the RJ11 jack.

250 ufd

8 ohm .5 W Speaker

Recommended Parts

Reference Designation Description Recommended Part Number

L1, L2 Ferrite Beads TDK CB30-1812 C1, C2 Capacitors Sprague 30GAT47, 470 pfd, 3000 Volts

J1 RJ11 Jack Stewart SS6446NF

XECOM (5) XE1401

XE1401 AT Commands

Modes of Operation

The XE1401 uses "AT" commands for control and configuration. The XE1401 operates in three modes; Command Mode, Fax Mode and Data Mode. Extensions to the AT command set support fax operation.

Data Mode: The modem enters data mode after it establishes a link and issues a "CONNECT" result code. In Data Mode the modem modulates all signals on Transmit Data, Pin 13, and sends them to the remote modem. The modem demodulates the signal from the remote modem and places it onto Received Data, Pin 3, for the host equipment. When the modem exits data mode, it issues a "NO CARRIER" result code.

Command Mode: The XE1401 enters command mode on application of power, reset, loss of the connection, or receipt of the escape sequence. In command mode the modem accepts commands from the host on Transmit Data. Appropriate result codes are returned on Received Data at the same speed and parity as the commands.

Fax Mode: The modem enters fax mode on receipt of the AT+FCLASS=1 command. Fax commands and responses are issued at 19,200 bits per second; the character format is 8 bits no parity. The modem accepts Class 1 Fax commands only in fax mode. The A/, ATO, AT&T and escape commands are not valid in fax mode.

Command Line - A command line may include multiple commands. The modem executes the commands in the sequence they appear in the command line. Spaces, inserted to improve legibility, do not fill space in the command buffer. A carriage return terminates 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 Buffer - The command buffer holds 40 characters, including the AT prefix. If it overflows, the modem issues an "ERROR" result code and commands are not executed.

Command Line Editing - A backspace can be used to edit the command any time before it is executed. The backspace character, Control and H simultaneously on some systems, erases the previous character in the command line. Any character except for the "A" and "T" can be erased. Register S5 allows the user to select a character other than a backspace to edit the command line.

Re-Execute Last Command - The A/ command causes the modem to re-execute the command line stored in the command buffer. This is the only command which does not require the "AT" prefix.

Omitted Parameters - Most commands include a parameter which determines the command function. When the parameter is omitted from the command string, it is assumed to be a 0.

Escape Characters - A three character escape sequence, entered

Commands

The modem is configured and controlled with AT commands. AT commands follow a strict format. 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 Format - Each command, except A/, begins with the AT prefix. The "A" and "T" may be both upper case or both lower case but cannot be of different cases. The modem uses the prefix to identify the host's speed and parity. The modem determines speed by measuring the width of the incoming bits and parity by comparing the parity bits of the "A" and "T." The modem then returns result codes at the host's speed and parity.

while in data mode, will switch the modem into command mode while remaining on line. The escape character, set by Register S2, is entered 3 times in succession to execute the escape. The default escape sequence is "+++."

Result Codes - The modem issues a result code after each action. Result codes may be provided as full words, numeric codes or may be disabled. 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 (6) XE1401

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