XECOM XE5614L Datasheet

XE5614L

Compact 56 KBPS Modem Module for Embedded Applications

October 2000

Description

Xecom's XE5614L is a complete, 56 Kbps modem in a
single component. The XE5614L can be used in through­out North America and Japan. It includes user transfer­rable FCC Part 68 Registration.

The XE5614L is a complete modem including the DAA.
XE5614L users do not need to add RAM, ROM, Crystals,
low distortion transformer, or switches to complete the
modem design. The user only needs to provide the TTL
level, serial interface and the telephone line connection.

The XE5614L is a full-featured modem. Besides 56 Kbps
data transfer, the XE5614L supports data compression,
error correction and fax transfer. The XE5614L also
includes NVRAM for permanent storage of the modem
configuration.

The XE5614L is pin compatible with Xecom's XE1414L,
and XE3314L modems. This family of modems permits a
simple upgrade path from 14,400 bps to 56,000 bps.

Features

Meets telecom requirements for North America, and

*

Japan: Includes User Transferrable FCC Part 68 Regis­tration

Small Size: 2.75 inches by 1.38 inches by 0.42 inches;

*

Modem Protocols for data transmission from 56 KBPS

*

down to 300 BPS: XEV.90 (56 Kbps), V.34bis, V.34,
V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A and 103;

* Modem Control and Configuration via standard AT

Commands

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.
Non-Volatile Memory including for storing telephone

*

numbers and modem configuration.

* Standard operating temperature range 0C to 70C.

Extended operating temperature range of -40C to +85C
is availalble.

Serial I/O

/DTR

/RTS
/CTS
/DSR
TXD
RXD

/DCD

Auxiliary I/O

RESET

AR

OH

AMP

Modem

Controller

Block Diagram

ROM

NVRAM

Analog

Front

End

DAA

Tip

Ring

XECOM (1) XE5614L

XE5614L 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; All pins tin-plated

A

B

Denotes Pin 1

C

G

G

D

XE5614L PIN CONFIGURATION

NC
AR

RXD

NC
NC
NC
NC
NC

/DTR

NC

/CTS

NC

TXD

/RTS

NC
/RI

1
2
3

4
5
6
7
8

9
10
11
12
13
14
15
16

F

K

H

40
39
38
37
36
35
34
33

32

31
30
29
28
27

E

VCC
/DSR
/DCD
NC
RESET
NC
NC
NC
NC
NC
OH
NC
NC
NC

J

H

TIP

RING

18

20

22
21

AMP
GND

XECOM (2) XE5614L

XE5614L 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 reasserted.
10 NC No Internal Connection
11 \CTS Clear to Send, Output, active Low, TTL/CMOS. \CTS provides the flow control output from the modem

when hardware flow control is selected. The modem revokes \CTS when 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 XE5614L 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 pin 3) from the internal DAA. The XE5614L is not sensitive to

the battery voltage polarity across Tip and Ring.
20 RING Ring connection to the phone line (RJ11 pin 4) 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.

27-29 N/C No Internal Connection

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

sure connects the modem to the telephone line. This signal is available only on the XE5614L.

31-35 N/C No Internal Connection

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 held a minimum of 100 milliseconds.
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

XECOM (3) XE5614L

XE5614L 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.

XE5614L ELECTRICAL SPECIFICATIONS

Parameter Min Typ Max Units Comments

VCC 4.75 5.25 Volts
ICC 130 150 170 ma On Line

45 Sleep Mode
Ring Voltage Detected 38 150 RMS Type B Ringer
Ring Frequency Detected 15.3 68 Hz T ype B Ringer
Telephone Loop Current 20 100 ma Off-Hook
Data Transmit level -12 -10.5 -9.0 dBm
DTMF Transmit Level -2.5 0 dBm Avg over 3 second interval

XECOM (4) XE5614L

XE5614L Typical Connection Diagram

16C550

UART

RJ11

3

4

C1

/DCD
/DSR

SIN

/DTR
/CTS
SOUT
/RTS
/RI

C2

FB1

FB2

RXD

/DTR

/CTS
TXD

/RTS

/RI

TIP

RING

XE5614L

VCC
/DSR
/DCD

AMP
GND

.2 ufd

50K

+ 5 Volts

LM386

10 ohms

.05 ufd

250 ufd

8 ohm,
.5 W
speaker

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

FB1, FB2 Ferrite Beads TDK ACB2012L-120-X

C1, C2 Capacitors Panasonic ECKDRS471, 470 pfd, 2600 VAC

J1 RJ11 Jack Stewart SS6446NF

XECOM (5) XE5614L

XE5614L AT COMMANDS

Modes of Operation

The XE5614L uses "AT" commands for modem control
and configuration. The XE5614L 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
establishing a modem link and issues a "CONNECT"
result code. In Data Mode the modem modulates all
signals presented 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 XE5614L 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 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 a
maximum of 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 line any time before it is executed.
The backspace character 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 XE5614L 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 "+++."

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.

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) XE5614L