XECOM XE2400 Datasheet

XECOM (1) XE2400

Low-Cost, Embeddable, Serial 2400bps Modem

XE2400

2/986

Description

Xecom's XE2400 provides the lowest cost
alternative for embedding a complete modem.
Its compact size, TTL level, serial interface and
low cost allows for quick integration into virtually
any new or existing equipment.

The XE2400 contains all of the circuitry required
for complete modem operation, including the
DAA. The XE2400 provides user transferable
FCC Part 68 registration, allowing direct
connection to the Telephone Network without
additional FCC testing.

Xecom designed the XE2400 specifically to
provide systems manufacturers with a quick, cost­effective way to integrate data communications
into their products. The low -speed data transfer
the XE2400 provides is ideal for applications with
small amounts of data to transfer in each session.
The combination of a complete, modular modem,
user transferable FCC Registration, the easily
integrated serial interface, and low cost makes
the XE2400 ideal for all applications which rely on
low speed communications

1 40
239
338

9
10
11
12
13
14
15
16

18

22

20 21

Reset

AR

RXD

DTR\

AA\

CTS\

OH

TXD

RTS\

HS\

RI\

TIP

RING

+5V
\DSR
\DCD

AMP
GND

PIN CONFIGURATION

Features

• Small Size 1.08” x 2.28” x 0.42”,

•

User Transferable FCC Part 68 Registration

• Data Transfer at 2400, 1200 and 300 bps

• Low Power operation:
On Line: 40 milliamps at 5 Volts
Sleep: <10 milliamps at 5 Volts

• TTL level serial interface

• Modem control with Industry standard “AT”
command set

• Pin compatible with a family of fax and higher
speed modems for an easy upgrade path

(Top View)

XECOM (2) XE2400

XE2400 Mechanical Specifications

INCHES METRIC(MM)

PIN MIN MAX MIN MAX

A 2.270 2.290 57.66 58.17
B 1.070 1.090 27.18 27.69
C 0.420 0.430 10.67 10.92
D 0.890 0.910 22.61 23.11
E 1.890 1.910 48.01 48.51
F 0.125 0.200 03.18 05.08
G 0.080 0.100 02.03 02.54
H 0.180 0.200 04.57 05.08
J 0.090 0.110 02.29 02.79
K 0.020 0.025 00.51 00.64

A

B

Pin 1 Identifier

C

E

D

J

H

G

F

K

PIN NAME DESCRIPTION

1 RESET External reset pin active HI, TTL. An internal circuit resets the modem when power

is applied, no external reset is required. Any external reset applied to the modem
must be applied for a minimum of 100 milliseconds.

2 AR Auxiliary Data/Voice Relay output, active HI, TTL/CMOS. When high the external,

auxiliary telephone set relay is closed and the modem is in the voice mode.

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.

4-8 No Pin

9 \DTR Data Terminal Ready, input, active LO, TTL. The function of this pin is set by the &D

command and the value in register S21.

10 \AA Auto Answer enable indicator, output, active LO, TTL/CMOS.

XE2400 Pin Descriptions

XECOM (3) XE2400

PIN NAME DESCRIPTION

XE2400 Pin Descriptions

11 \CTS Clear to Send, output, active LO, TTL/CMOS. A low indicates the modem is ready

to accept data signals for transmission.

12 OH Off-Hook, output, active HI, TTL/CMOS. A high indicates the modem's hookswitch

relay is closed connecting the modem to the telephone line.

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 LO, TTL.
15 HS High Speed indicator, output, active LO, TTL/CMOS. Low when operating at 2400bps rate,

high otherwise.
16 \RI Ring Indicator, output, active LO, TTL. When low indicates the modem is receiving a ring

signal.
17 No Pin
18 TIP Tip connection to the phone line (RJ11 pin3) from the internal DAA.
19 No Pin
20 RING Ring connection to the phone line (RJ11 pin4) from the internal DAA.

Caution: Observe design rules for Tip & Ring trace layout.

21 GND Ground.
22 AMP Audio output to speaker. Function is determined by L & M commands and the value in register

S22. The input impedance to the speaker driver must be greater than 300 ohms.

23-37 No Pin

38 \DCD Data Carrier Detect, output, active LO, TTL/CMOS. Function is set by the &C command and

the value in register S21.
39 \DSR Data Set Ready, output, active LO, TTL/CMOS. Function is set by the &S command and the

value in register S21.
40 Vcc +5 Volts.