XECOM XE1401I, XE1401G, XE1401F, XE1401B, XE1401 Datasheet

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XE1401

4/99

Multi-National 14,400 BPS Embeddable Modem

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

USA1

XE1401

*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

1 (user transferable FCC Registration)

Block Diagram

Serial I/O

/DTR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/CTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/DSR

 

 

 

 

 

 

ROM

 

 

 

 

 

 

 

 

 

 

TXD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RXD

 

 

 

 

 

 

 

 

 

Analog

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tip

/DCD

 

 

 

Modem

 

 

 

 

 

 

DAA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Front

 

 

 

 

 

 

 

 

Controller

 

 

 

 

 

 

 

 

 

 

 

Ring

Auxiliary I/O

 

 

 

 

 

 

End

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NVRAM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/LCS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

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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

 

A

 

C

J

M

H

E

 

B

K

F

D

G L

XE1401 PIN CONFIGURATION

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

 

1

 

 

 

40

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N/C

 

 

 

2

 

 

 

39

 

/DSR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RXD

 

 

 

3

 

 

 

38

 

/DCD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/DTR

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/LCS

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/CTS

 

 

 

11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OH

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXD

 

 

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RTS

 

 

 

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RI

 

 

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIP

 

 

 

18

 

 

 

22

 

AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RING

 

 

 

20

 

 

 

21

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

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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

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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

170

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

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XE1401

XE1401 Typical Applications/DSchematicR

/DCD

16C450

 

 

VCC

 

 

SIN

RXD

 

 

 

UART

/DSR

 

 

 

 

 

 

 

XE3301 /DCD

 

 

 

 

 

 

 

 

XE1401

 

 

 

/DTR

/DTR

 

 

 

 

/CTS

/CTS

 

 

 

 

SOUT

TXD

 

 

 

 

/RTS

/RTS

 

 

 

 

/RI

/RI

 

 

 

 

 

Tip

AMP

 

 

 

 

 

 

 

 

 

Ring

GND

+5 Volts

 

 

 

 

.2 ufd

 

 

 

 

50K

 

250 ufd

 

 

 

LM386

 

 

 

 

 

 

 

 

 

 

.05 ufd

 

 

 

 

 

 

8 ohm .5 W

 

 

L2

L1

10 ohms

Speaker

 

 

 

 

 

 

C1

 

 

C2

4Line 3 J1

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

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

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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.

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.

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 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

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XE1401

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