XECOM XE2400 Datasheet

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XE2400

2/986

Low-Cost, Embeddable, Serial 2400bps Modem

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

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

PIN CONFIGURATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset

 

1

 

 

 

 

40

 

+5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AR

 

2

 

 

 

39

 

\DSR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RXD

 

3

 

 

 

38

 

\DCD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Top View)

 

 

 

 

DTR\

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AA\

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CTS\

 

11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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TXD

 

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RTS\

 

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16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIP

 

18

 

 

 

 

 

22

 

AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RING

 

20

 

 

 

21

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

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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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

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

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

Pin 1 Identifier

C

 

D

 

K

F

G

 

J

E

 

 

H

XE2400 Pin Descriptions

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.

 

 

 

 

 

 

XECOM

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XE2400

XE2400 Pin Descriptions

PIN

NAME

DESCRIPTION

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.

 

 

 

XECOM

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XE2400

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