XECOM XE3314B Datasheet

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XE3314B

June 2000

Low-Cost, Embeddable 33,600 BPS Modem Module

Description

Xecom's XE3314B is a complete, low-cost 33,600 bps modem in a single component. The XE3314B includes a transferrable FCC Part 68 Registration and is a UL1950 recognized component.

The XE3314B is a complete modem and includes the DAA. XE3314B 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 XE3314B is a full-featured modem. Besides 33.6 Kbps data transfer, the XE3314B supports data compression, error correction and fax transfer. The XE3314B also includes NVRAM for permanent storage of the modem configuration.

The XE3314B is pin compatible with Xecom's XE1414B modem. This family of modems permits a simple upgrade path from 14400 bps to 33,600 bps.

Features

*FCC Part 68 Registration transferrable to customer’s system

*UL1950 Recognized Component

*Small Size: 2.75 inches by 1.38" by 0.42"

*Modem Control and Configuration through industry standard AT Commands.

*Modem Protocols: V.34bis, V.34, V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A and 103

*Fax Protocols: V.17, 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 133,400 bps.

*Pin compatible with Xecom's XE1414B, XE1414C, XE3314C and XE5614C.

Serial I/O

Block Diagram

 

 

 

/DTR

 

 

/RTS

 

 

/CTS

 

 

/DSR

ROM

 

TXD

 

RXD

 

Tip

/DCD

Analog

Modem

Front

DAA

Controller

Ring

End

Auxiliary I/O

 

NVRAM

 

RESET

 

 

 

AR

 

 

OH

 

 

AMP

 

 

XECOM

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XE3314B

XE3314B Mechanical Specifications

 

INCHES

METRIC(MM)

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

Denotes Pin 1

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

K

0.020

0.025

0.51

0.64

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pins = 0.025 inch square pin

 

 

 

D

 

 

G

 

 

 

 

 

 

 

 

 

 

 

All pins tin-plated

 

 

 

 

 

 

 

 

 

 

J

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

XE3314B PIN CONFIGURATION

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

1

 

40

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AR

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TST3

 

 

 

10

 

31

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/CTS

 

 

 

11

 

30

 

 

 

OH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

12

 

29

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXD

 

 

 

13

 

28

 

 

 

TST1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RTS

 

 

 

14

 

27

 

 

 

TST2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RI

 

 

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIP

 

 

 

18

 

22

 

 

 

AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RING

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

K

F

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XE3314B

XE3314B Pin Descriptions

 

PIN NAME

DESCRIPTION

 

1

NC

No Internal Connection

 

2

AR

Auxiliary Data/Voice Relay, Active High Output, TTL/CMOS. The AR signal goes high when ever

 

 

 

the modem is in the on-hook state. It can be connected to an external relay to switch control of the

 

 

 

telephone line between the modem and an auxiliary handset when.

 

3

RXD

Received Data, Output, TTL. Serial data output to the host. A logic "High" on RXD represents a

 

 

 

"mark" and a logic "Low" represents a "space".

 

4-8

NC

No Internal Connection

 

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

TST3

Test 3 is used for manufacturing purposes only. It has no function in normal operation.

 

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

NC

No Internal Connection

 

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 XE3314B uses \RTS for hardware flow control. When

 

 

 

\RTS is revoked; hardware flow control is enabled, and 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 XE3314B 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.

 

27, 28

TST1, TST2 Test 1 and Test 2 are used for manufacturing test only. They have no function in normal use. These

 

 

 

pins are connected to the telephone line side of the telephone interface circuit so isolation must be

 

 

 

maintained between these signals and all other circuits.

 

30

OH

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

 

 

 

closure connects the modem to the telephone line. This signal is available only on the XE3314B.

 

36

RESET

Hardware reset pin, Input, active High, TTL. A high on Pin 36 initiates a hardware reset. An external

 

 

 

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

 

37

N/C

No Internal Connection

 

38

\DCD

Data Carrier Detect, Output Active Low, TTL/CMOS. The &C command sets the function of \DCD. In

 

 

 

the default state \DCD activates when a valid carrier is detected.

 

39

\DSR

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

 

 

 

AT&S0, \DSR is forced true.

 

40

Vcc

+5 Volts.

 

 

 

 

 

 

 

 

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XE3314B

XE3314B Electrical Specifications

 

Parameter

Min

Typ

Max

Units

Comments

 

 

 

 

 

 

 

 

VCC

4.75

 

5.25

Volts

 

 

 

 

 

 

 

 

 

ICC

170

200

220

ma

On Line

 

 

 

 

 

 

 

 

Ring Voltage Detected

38

 

150

RMS

XE3314B

 

 

 

 

 

 

 

 

Ring Frequency Detected

15.3

 

68

Hz

 

 

 

 

 

 

 

 

 

Telephone Loop Current

10

 

100

ma

XE3314B

 

 

 

 

 

 

 

 

Data Transmit level

-12

-10.5

-9.0

dBm

 

 

 

 

 

 

 

 

 

DTMF Transmit Level

 

-2.5

0

dBm

Avg over 3 second interval

 

 

 

 

 

 

 

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.

XECOM

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XE3314B

XE3314B Typical Applications Schematic for US, Canada and Japan

16C450 UART

/DSR

/DCD

 

 

 

 

 

 

 

VCC

 

SIN

RXD

 

 

 

 

 

 

/DSR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/DCD

 

 

 

 

 

XE3314B

 

 

 

 

 

XE3301

 

 

/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 ACB2102L-120-X

C1,

C2

Capacitors

Panasonic ECKDRS471, 470 pfd, 2600 Volts

J1

RJ11 Jack

Stewart SS6446NF

 

 

 

 

XECOM

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XE3314B

XE3314B AT Commands

Modes of Operation

The XE3314B uses "AT" commands for control and configuration. The XE3314B 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 XE3314B 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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XE3314B

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