XECOM XE3314L Datasheet

XE3314L

October 2000

Compact 33.6 KBPS Modem Module for Embedded Applications

Description

Xecom's XE3314L is a complete, 33.6 Kbps modem in a
single component. The XE3314L can be used in through­out North America and Japan. It includes user transfer­rable FCC Part 68 Registration.

The XE3314L is a complete modem including the DAA.
XE3314L 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 XE3314L is a full-featured modem. The XE3314L
supports data compression, error correction and fax trans­fer. The XE3314L also includes NVRAM for permanent
storage of the modem configuration.

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

Features

User Transferrable FCC Part 68 Registration

*

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

*

Modem Protocols for data transfer from 33.6 KBPS

*

down to 300 BPS: 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 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) XE3314L

XE3314L 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

XE3314L 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) XE3314L

XE3314L 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 XE3314L 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 XE3314L 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 XE3314L.

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) XE3314L

XE3314L 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.

XE3314L ELECTRICAL SPECIFICATIONS

Parameter Min Typ Max Units Comments

VCC 4.75 5.25 Volts
ICC 130 140 160 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) XE3314L

XE3314L 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

XE3314L

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 470 pfd 2600 VAC Capacitors Panasonic ECKDR471

J1 RJ11 Jack Stewart SS6446NF

XECOM (5) XE3314L