XECOM XE1414A Datasheet

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xecom

XE1414A

2/97

14,400 BPS Modem for Data, Fax, Voice

Description

Xecom's XE1414A combines high-speed data and Group III send/receive fax in a compact component.

The XE1414A is not just a modem chip but a complete modem including the telephone interface. It provides user transferable FCC Part 68 registration and can connect directly to the telephone line through an RJ11 jack. The modem connects to the host through a TTL level serial interface. The XE1414A also includes MNP2-4 MNP10 and V.42 error control and MNP5 andV.42bis data compression

Xecom designed the XE1414A specifically to be embedded in commercial and industrial systems with a need for high-speed communications and minimal space.

Features

Small Size; 2.75 " x 1.38" x 0.42"

Modem control with "AT" commands

• Class 1 and Class 2 fax commands

• Data transfer up to 14,400 bps

• Send and receive fax to 14,400 bps

MNP and V.42 Error Control

MNP10 Error Control for Cellular Links

MNP5 Data Compression to 28,800 bps

V.42bis Data Compression to 57,600 bps

Low power, single +5V supply Operating Power 600 mW (Typ.) Sleep mode: 30 mW (Typ.)

NVRAM for modem configuration storage

Block Diagram

XE1414A PinConfiguration

 

 

 

 

 

 

NC

1

40

VCC

 

NC

2

39

/DSR

 

RXD

3

38

/DCD

 

NC

4

37

NC

 

NC

5

36

RESET

 

NC

6

35

NC

 

NC

7

34

NC

 

NC

8

33

NC

 

/DTR

9

32

NC

 

NC

10

31

NC

 

/CTS

11

30

OH

 

NC

12

29

NC

 

TXD

13

28

NC

 

/RTS

14

27

NC

 

NC

15

 

 

 

/RI

16

 

 

 

TIP

18

22

AMP

 

 

 

 

RING

20

21

GND

 

 

 

 

 

 

 

 

 

 

XE1414A Mechanical Specifications

 

INCHES

METRIC(MM)

 

 

 

 

 

PIN

MIN

MAX

MIN

MAX

A

2.74

2.760

69.60

70.10

B

1.370

1.390

34.80

35.31

C

0.420

0.430

10.67

10.92

D

1.190

1.210

30.23

30.73

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

 

 

 

 

 

Pins = 0.025 inch square pin

Symbol

Parameter

Typ

Max

Units

Comments

Vcc

Supply Voltage

5.0

5.25

Volts

 

Icc

Vcc Supply Current

120

150

mA

Active, On Line

 

 

30

 

mA

Active, Idle

Iccs

Sleep Current

6.0

10.0

mA

Sleep Mode

 

 

 

 

 

 

Power Management: The XE1414A has an integrated power management capability. If no activity is detected on the RXD, DTR, or RI the modem will, within 5 seconds, automatically go into a smart sleep mode. In this mode power consumption is typically less than 50 milliwatts.

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.

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XE1414A

XE1414A Pin Descriptions

PIN

NAME

DESCRIPTION

3

RXD

Serial data output to the DTE (i.e. external UART). A logic "high" represents a

 

 

"mark" and a logic "low" represents a "space", TTL.

9

\DTR

Data Terminal Ready, input, active Low, TTL. The function of this pin is set by

 

 

the &D command. Normally the modem ignores DTR.

11

\CTS

Clear to Send, output, active Low, TTL/CMOS. This pin regulates the flow of

 

 

data from the DTE during hardware flow control.

13

TXD

Serial data input from the DTE (i.e. external UART). A logic "high" represents a

 

 

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

14

\RTS

Request to Send, input, active Low, TTL. This signal regulates the flow of data

 

 

from the modem during hardware flow control.

16

\RI

Ring Indicator, output, active Low, TTL. When low indicates the modem is

 

 

receiving a ring signal.

19

TIP

Tip connection to the phone line(RJ11 pin3) from the internal DAA.

20

RING

Ring connection to the phone line(RJ11 pin4) from the internal DAA. Caution:

21

GND

Ground (0 volts)

22

AMP

Audio output function is determined by L & M commands and the value in

 

 

register S22. This output can drive a 300 ohm load.

30

OH

Oh is an active low output from the modem. Oh goes high when the modem is

 

 

"off-hook." This signal can be used to drive and external relay to switch line

 

 

usage between the modem and a handset.

36

RESET

Hardware reset pin, active High, TTL. Use of an external reset is not

 

 

recommended. When not used Reset should be left open. Any signal applied to

 

 

Pin 36 must remain high for a minimum of 100 milliseconds.

38

\DCD

Data Carrier Detect, output, active Low, TTL/CMOS. Function is set by the &C

 

 

command and the value in register S21.

39

\DSR

Data Set Ready, output, active Low, TTL/CMOS. Function is set by the &S

 

 

command and the value in register S21.

40

Vcc

+5 Volt power

 

 

 

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XE1414A

XE1414A Applications Schematic

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

Recommended Part Number

L1, L2, L3

TDK CB30-1812

C1, C2, C3

Sprague 30GAT47, 470 pfd, 3000 Volts

J1, J2

Stewart SS6446NF

K1

Theta J LCB110

 

 

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XE1414A

AT Commands

The XE1414A uses "AT" commands for modem configuration and control. Extensions to the AT commands support fax and voice.

Modes of Operation

The XE1414A has three operational modes; Command, Fax and Data.

Data Mode: The XE1414A enters data mode after it establishes a connection and issues a "CONNECT" result code. In the Data Mode the modem sends all signals on Transmit Data to the remote modem and puts data from the remote modem onto Received Data for the host equipment. When the modem exits data mode, it issues a "NO CARRIER" result code.

Command Mode: The XE1414A enters command mode on power-up, reset, loss of the 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.

Fax Mode: The XE1414A enters Class 1 fax mode on receipt of AT+FCLASS=1 and Class 2 fax mode on receipt of AT+FCLASS=2. In fax mode commands and responses are issued at 19,200 bits per second; the character format is 8 bits no parity. The modem accepts fax commands only in fax mode. The A/, ATO, AT&T and escape commands are not valid in fax mode.

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 editied with the backspace key.

Command Prefix - The "A" and "T" of the command prefix may be both capitilized or both lower case but cannot be of different cases. The prefix identifies the speed and parity of the host. The modem determines speed by measuring the width of the incoming bits. Parity is determined by comparing the parity bits of the "A" and "T." The XE1414A normally sends result codes at the speed and parity determined by the prefix.

Command Line - Multiple commands may be placed in a command line. Commands are executed in the sequence they appear. Spaces may be inserted to improve legibility without filling 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 - Only 40 characters, including the AT prefix, may be loaded into the command buffer. If the command buffer overflows, the modem issues an "ERROR" result code and commands are not executed.

Command Line Editing - The backspace can be used to edit the command line. Hitting the backspace key, or Control and H simultaneously on some systems, erases the previous character in the command line. All of the characters can be erased except for the "A" and "T." 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 last command line. This is the only command which does not require the "AT" prefix.

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

Escape Characters - A three character escape sequence maybe entered while in data mode to switch the modem into command mode while remaining on line. The escape character, set by Register S2, must be 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 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.

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XE1414A

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