XECOM XE2486 Datasheet

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xecom

XE2486

8-97

Miniature 2400 bps Modem Module

Description

Xecom's XE2486 is a miniature, low cost 2400 bit per second modem. It provides a complete modem, including necessary memory and the DAA in a package just 1.0 inch by 1.25 inches. User transferable FCC Part 68 registration is included.

The XE2486 was specifically designed to provide OEM system designers with a quick, easy and low-cost way to integrate a 2400 bits per second modem. Industry standard "AT" commands provide modem control and configuration. The XE2486 interfaces with the system host through a TTL level, serial interface.

Features

Supported Protocols: V.22bis, V.22, V.21, Bell 212A and 103

"AT" commands for modem control and configuration.

Small Size: 1.25 inches long, 1.0 inches wide, 0.50 inches high.

NVRAM stores commonly dialed numbers and custom modem configurations

Single +5V supply

Low power CMOS: Operating: 200 mW (Typ.) Sleep mode: 50 mW (Typ.)

Block Diagram

 

VCC

 

 

Serial I/O

 

 

 

TXD

 

 

 

RXD

 

 

 

\DTR

 

 

 

\DSR

 

 

 

\RI

ROM

NVRAM

 

\CTS

 

 

 

 

\DCD

 

 

 

 

Modem

 

 

 

Controller

 

 

Auxilliary I/O

 

 

 

TXA

Analog

 

Tip

RXA

 

 

\V-D

Front End

DAA

Ring

\HS

 

 

 

RST

 

 

 

\SLEEP

 

 

 

 

 

 

SPK

 

Gnd

 

 

XECOM

 

 

XE2486

XE2486 Mechanical Specifications

 

INCHES

METRIC(MM)

 

 

A

 

 

 

 

 

 

 

 

 

 

 

PIN

MIN

MAX

MIN

MAX

 

 

 

 

 

 

 

 

 

 

 

 

A

1.240

1.260

31.50

32.00

 

 

 

 

 

 

 

 

 

 

 

 

B

0.990

1.010

25.15

25.65

 

 

 

 

 

 

 

 

 

 

 

 

C

0.490

0.510

12.45

12.95

 

 

 

 

 

 

 

 

 

 

 

 

D

0.120

0.140

3.05

3.56

 

 

 

 

 

 

 

 

 

 

 

 

E

0.090

0.110

2.29

2.79

 

 

 

 

 

 

 

 

 

 

 

B

F

0.060

0.080

1.52

2.03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

0.090

0.110

2.29

2.79

 

 

 

 

 

 

 

 

 

 

 

 

H

0.790

0.810

20.07

20.57

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Denotes Pin 1

 

 

 

 

 

 

 

 

 

Pins = 0.010 by 0.020 inches

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

D

G

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F E

 

 

 

 

F

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Configuration and Descriptions

PIN

NAME

DESCRIPTION

 

 

 

 

 

 

 

 

1

Ring

Ring provides half the two-wire con-

 

 

 

 

XE2486

 

 

 

 

 

nection to the telephone network,

 

 

 

 

 

 

 

 

 

 

RJ-11 Pin 4. A 1500 volt barrier

 

RING

 

1

22

 

N/C

 

 

 

 

TIP

 

2

21

 

RST

 

 

 

isolates Ring from all other circuits.

 

 

 

 

 

 

 

 

 

 

20

 

GND

 

 

 

This isolation must be preserved

 

RXA

 

3

19

 

VCC

 

 

 

 

TXA

 

4

18

 

/HS

 

 

 

throughout the system. The battery

 

 

 

 

 

 

 

SPK

 

5

17

 

/DCD

 

 

 

voltage on Ring may be positive or

 

N/C

 

6

16

 

/CTS

 

 

 

negative with respect to Tip.

 

N/C

 

7

15

 

/RI

 

 

 

 

/SLP

 

8

14

 

/DSR

 

 

 

 

 

 

 

 

2

Tip

Tip provides half the two-wire con-

 

N/C

 

9

13

 

/DTR

 

 

TXD

 

10

12

 

/V-D

 

 

 

 

 

 

 

 

 

 

nection to the telephone network,

 

RXD

 

11

 

 

 

 

 

 

RJ-11 Pin 3. A 1500 volt barrier

 

 

 

 

 

 

 

 

 

 

isolates Tip from all other circuits. This isolation must be preserved throughout

 

 

the system. The battery voltage on Tip may be positive or negative with respect

 

 

to Ring.

 

 

 

 

 

 

 

 

3,4

N/A

Not used; Do not connect any circuitry to these Pins.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

(2)

XE2486

Pin Descriptions continued

PIN

NAME

DESCRIPTION

5

SPK

SPK provides the audio output to a speaker. Speaker output is controlled by the

 

 

ATL and ATM commands. The input impedance to the speaker driver must be

 

 

greater than 300 ohms.

6, 7

N/C

No Connection

8

/SLP

This active low output indicates when the modem is in the sleep mode.

9

N/C

No Connection

10

TXD

TXD provides serial data input from the host. A logic high represents a "Mark"

 

 

and a low represents a "Space".

11

RXD

RXD provides serial data output to the host. A logic high represents a "Mark"

 

 

and a low represents a "Space".

12

/V-D

The Voice-Data ouptut can be used to drive an external relay for switching

 

 

between the modem and handset connected to the same telephone line.

13

/DTR

Data Terminal Ready is an active low input to the modem. The AT&D command

 

 

sets the function of DTR.

14

/DSR

Data Set Ready is an active low output from the modem. Its operation is

 

 

determined by the AT&S command.

15

/RI

Ring Indicator is an active low output which marks the presence of a ring on the

 

 

line.

16

/CTS

Clear to Send is not used on the XE2486; it will remain low at all times.

17

/DCD

Data Carrier Detect goes low to indicate receipt of a valid incoming carrier. The

 

 

AT&C1 command enables the carrier detect function.

18

/HS

This active low output indicates when the XE2486 has made a 2400 bps

 

 

connection.

19

VCC

VCC provides the +5 volt power required by the modem.

20

Gnd

Ground provides the common reference for the XE2486.

21

RST

This active high input cause a hardware reset in the XE2486. The reset pulse

 

 

must be held high for at least 10 milliseconds to correctly reset the modem.

22

N/C

No Connection

 

 

 

XECOM

(3)

XE2486

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