Cermetek DataSheet for product XE5620SM

Preliminary

XE5620SM

February 2003

Compact Global Modem Board

Description

Features

Xecom’s XE5620SM is a complete modem on a compact

* Small Size: 2.175” by 1.00” by 0.3”

PCB (daughter board). Xecom includes transferable

* Data transfer at rates from 300 bps to 56 kbps using

FCC Part 68 Registration to the user of the XE5620SM.

V.90, V.34bis, V.34, V.32bis, V.32, V.22bis, V.22, V.23, V.21,

This allows the embedded system designer to easily add

Bell 212A, and Bell 103 Protocols

modem communications to his process control, remote

* Modem Control and Configuration via industry

monitoring, point-of-sale, or remote diagnostic system

standard AT Commands.

without additional FCC testing.

* Supports V.42 error correction and V.42bis data

compression.

Xecom’s XE5620SM has a twenty percent smaller

footprint than other modem daughter board products.

* Nonvolatile memory stores modem configuration and

permits stored number dialing.

This reduced footprint saves board space and allows

the design engineer greater flexibility in placement of the

* Incorporates Fax send and receive capabilities

controlled by Class 1 Fax commands.

modem within the host system.

* Complete integrated DAA.

A variation of the XE5620SM, the XE5620SM-F,

* User Transferrable FCC Part 68 Registration

incorporates Flash memory onto the daughter board.

* Complies with telephone networks around the world.

The presence of Flash memory allows future updating of

the modem code when features are added.

* UL60950 Recognition

* Low Power operation, 3.3 Volts, 300 milliwatts;

XE5620SM/XE5620SM-F BLOCK DIAGRAM

NVRAM

Reset

/TXD

ROM or Flash

/RXD

(XE5620SM-F)

/RTS

Modem

Global

/DSR

Controller

Analog

Telephone

Tip

/DCD

Front

Line

Ring

/CTS

End

Interface

/DTR

(DAA)

/RI

SPKR

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XE5620SM

XE5620SM Mechanical Specifications

(Top View)

Inches

Millimeters

Dimension

Min

Typ

Max

Min

Typ

Max

2.170

2.175

2.180

55.12

55.24

55.37

0.995

1.000

1.005

25.27

25.40

25.53

0.890

0.900

0.910

22.61

22.86

23.11

0.110

0.120

0.130

2.79

3.05

3.30

0.090

0.100

0.110

2.29

2.54

2.79

0.240

0.250

0.260

6.10

6.35

6.60

0.059

0.062

0.065

1.50

1.57

1.65

0.790

0.800

0.810

20.07

20.32

20.83

0.090

0.100

0.110

2.29

2.54

2.79

0.137

0.1375

0.138

3.48

3.49

3.51

1.230

1.240

1.250

31.24

31.50

31.75

1.490

1.500

1.510

37.85

38.10

38.35

0.290

0.300

0.310

7.37

7.62

7.87

Note: All pins are .025” square

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XE5620SM

XE5620SM Pin Configuration

Top View

Tip

Ring

VCC

/DCD

/CTS

/DSR

/RTS

EXM

/RXD

/Reset

/TXD

SPKR

/DTR

Gnd

/RI

Pin Descriptions

PIN NAME

DESCRIPTION

Tip

The Ring and Tip signals connect the modem to the telephone line. FCC Part 68 Rules require a

1500 volt isolation barrier between the telephone line and all other circuits. This isolation must

be preserved throughout the system.

The telephone company places a DC “Battery” voltage across Tip and Ring on public switched

telephone lines. The XE5620SM operates regardless of the polarity of this “Battery” voltage.

The “Battery” voltage drives up to 100 milliampere of DC loop current.

UL60950 requires minimum creepage and clearances distances between the Tip and Ring traces

and all other circuits. Clearance is the shortest distance between conductive circuits; creepage

is the distance between conductive points along the surface

Ring

The Ring and Tip signals connect the modem to the telephone line. FCC Part 68 Rules require a

1500 volt isolation barrier between the telephone line and all other circuits. This isolation must

be preserved throughout the system.

The telephone company places a DC “Battery” voltage across Tip and Ring on public switched

telephone lines. The XE5620SM operates regardless of the polarity of this “Battery” voltage.

The “Battery” voltage drives up to 100 milliampere of DC loop current.

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XE5620SM

XE5620SM Pin Descriptions (continued)

NAME

DESCRIPTION

UL60950 requires minimum creepage and clearances distances between the Tip and Ring traces

and all other circuits. Clearance is the shortest distance between conductive circuits; creepage

is the distance between conductive points along the surface.

EXM

EXM will be high when Flash memory is used, XE5620SM-F. Do not attach any signal to this pin.

RESET

RESET is an active low input which initiates a modem hardware reset. RESET must be active for

a minimum of 100 milliseconds for a proper modem reset sequence. No external reset is required;

if none is used the RESET signal should be left open.

SPKR

SPKR allows connection of a speaker to monitor modem operations. SPKR cannot directly drive

a speaker; an amplifier with a minimum input impedance of 300 ohms is required. The signal on

SPKR is controlled by the ATL and ATM commands.

Ground

Ground provides the reference voltage for all host interface signals.

/RI

The /RI signal reports on the presence of an incoming ring signal. When a ring occurs across

Tip and Ring, the /RI output goes low and toggles with the cadence of the ring signal..

/DTR

/DTR is an active low input to the modem. An active /DTR signals the terminal is available for

communications. The AT&D command determines how the modem interprets activity on /DTR.

/TXD

/TXD provides the path for transmitted data and modem commands to be passed from the host

controller to the modem.

/RXD

/RXD provides the path for received data and modem responses to be sent from the modem to

the host controller.

/RTS

/RTS is an active low input to the modem. When hardware flow control is set, ab active /RTS

indicates to the modem that the host has data to send.

/DSR

/DSR is an active low output from the modem. An active /DSR indicates the modem link is

established. The AT&S command controls when the XE5620SM asserts /DSR.

/CTS

/CTS is an active low output from the modem. When hardware flow control is set, the modem

asserts /CTS to indicate that it can accept data from the terminal equipment on /TXD.

/DCD

/DCD is an active low output from the modem. An active /DCD indicates the presence of a valid

carrier signal. The AT&C command controls when the XE5620SM asserts /DCD.

VCC

VCC provides 3.3 volt power to the modem.

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XE5620SM

XE5620SM Electrical Specifications

Parameter

Min

Typ

Max

Units

Comments

VCC

3.13

3.3

3.47

Volts

ICC

100

On Line

ICC

On-Hook

Ring Voltage Detected

150

VRMS

Type B Ringer

Ring Frequency Detected

15.3

Type B Ringer

Telephone Loop Current

100

Line Impedance

600

Ohms

Data Transmit level

-12.0

-9.0

dBm

DTMF Transmit Level

-2.5

dBm

Avg over 3 second interval

Voh

2.4

Volts

Vol

0.4

Volts

Vih

2.0

VCC+0.3

Volts

Vil

-0.3

0.8

Volts

XE5620SM ABSOLUTE MAXIMUM RATINGS

Storage Temperature

-25 O C to +85 O C

1 Maximum Operating Temperature Range

0 O C to +70 O C

Maximum Time Above Eutectic (183 O C)

90 seconds

Preheat Dwell Time

120 to 180 seconds

1 The XE5620SM can be ordered with an Operating Temperature of -40 O C to +85 O C at extra cost. Order

XE5620SM-ITR or to specify Industrial Temperature Range (ITR).

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XE5620SM

XE5620SM Typical Connection Diagram

XE5620SM

RJ11

VCC

FB1

TIP (1)

Ring (2)

FB2

VCC (15)

/DCD (14)

/CTS (13)

VCC

/DSR (12)

/RTS (11)

To Host Serial Port

/RXD (10)

EXM (3)

/TXD (9)

/RESET (4)

/DTR (8)

SPKR (5)

/RI (7)

Gnd (6)

LS1

Parts List for XE5620SM Typical Connection Diagram

Reference

Designation

Qty

Description

Designation

Qty

Description

C1, C2

Cap. 470 pfd 2600V

National Semi LM386

C3, C4

Cap. 0.1 ufd 20% 16V

LS1

Speaker, 8 Ohms

Cap. 100 ufd 20% 10V

Potentiometer, 10K

FB1, FB2

Ferrite, TDK ACB2012L-120

Resistor, 10 Ohms 20 %

F1, F2

PTC, TR600-150

Notes:

FB1 and FB2 are ferrite beads which may be required for EMI filtering in your system. Without these

components you may experience unintended radiation when the telephone cable is attached. We recommend

selecting components such as the TDK ACB2012L-120 which provide a minimum of 100 ohms of impedance

at frequencies above 100 MHz.

2. C1 and C2 are high-voltage capacitors which may be required for EMI filtering in your system. Without these

components you may experience unintended radiation when the telephone cable is attached to your system. We

recommend selecting components such as the Panasonic ECKDRS471. This 470 pfd, 3000 volt capacitor will

direct the high frequency harmonics to the system ground. These capacitors must be rated at a minimum of 1500

volts to maintain the isolation required by FCC Part 68 Rules.

3. F1 and F2 are positive thermal coefficient (PTC) devices which protect the modem form excessive current

flow. These devices are required for your system to pass UL60950. Fuses may be used in place of the PTC’s

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XE5620SM

Country Selection

Xecom has designed the XE5620SM to function in a wide variety of countries throughout the world.

Below is a list of the available country configurations. Please contact Xecom if you have questions

regarding a country not on this list.

Countries Supported:

COUNTRY

AT COMMAND

COUNTRY

AT COMMAND

Australia

AT*NC40

Lichtenstein

AT*NC29

Austria

AT*NC1

Luxembourg

AT*NC9

Belgium

AT*NC2

Namibia

AT*NC26

Czech Republic

AT*NC19

Norway

AT*NC11

Denmark

AT*NC3

Poland

AT*NC24

Finland

AT*NC4

Portugal

AT*NC12

France

AT*NC5

Russia

AT*NC25

Germany

AT*NC6

South Africa

AT*NC27

Greece

AT*NC17

Spain

AT*NC13

Holland

AT*NC10

Sweden

AT*NC14

Iceland

AT*NC28

Switzerland

AT*NC15

India

AT*NC18

Taiwan

AT*NC20

Ireland

AT*NC7

United Kingdom

AT*NC16

Italy

AT*NC8

United States

AT*NC22

Japan

AT*NC43

NOTE: Country regulations permit Xecom to offer transferrable registration only in the United

States, FCC Part 68 only. All other required certifications of systems using the XE5620SM are the

responsibility of Xecom’s customer. Xecom will assist our customers with any of these certifications.

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XE5620SM

XE5620SM AT Commands

The XE5620SM uses "AT" commands for configuration

Command Line - Commands may be strung together in a

and control. This section describes the AT command

single command line of up to 36 characters. Commands

format and lists the AT commands, Registers and Result

are executed in the sequence they appear. Spaces may be

codes. XE5620SM "AT" commands have two operational

inserted into the command line but do not fill space in the

modes; Command Mode, Data Mode and FAX mode.

command buffer. A carriage return terminates the com-

mand line and causes the commands to be executed.

Data Mode: The XE5620SM enters data mode after it

connects to a remote modem and issues the appropriate

a carriage return to terminate the command line.

result code. In the Data Mode the modem sends all data

presented on Transmit Data (/TXD) to the remote

Command Buffer -

The Command Buffer holds a

modem and puts data from the remote modem onto

maximum of 36 characters, including the AT prefix.

Received Data (/RXD). When the modem exits data

the command buffer overflows, the modem issues an

mode, it issues a "NO CARRIER" result code.

"ERROR" result code and commands are not executed.

Command Mode: The XE5620SM enters command mode

Command Line Editing -

The backspace edits a

on power-up, reset, a lost connection, or receipt of the

command line before it is executed. The backspace key,

escape code.

In command mode the modem accepts

(Control and H simultaneously on some systems), erases

commands from the host on transmit data. Appropriate

the previous character in the command line. Register S5

result codes are returned on received data.

allows the user to select a character other than a back-

space to edit the command line.

Fax Mode: The XE5620SM enters Class 1 fax mode on

receipt of AT+FCLASS=1. In fax mode commands and

Re-Execute Last Command - The A/ command causes

responses are issued at 19,200 bits per second; the

the modem to re-execute the last command line. This is

character format is 8 bits no parity. The modem accepts

the only command which does not require the "AT"

fax commands only in fax mode. The A/, ATO, AT&T and

prefix.

escape commands are not valid in fax mode.

Omitted Parameters - Most commands include a pa-

Command Line Format

rameter which determines how the functions will be set.

Command lines issued to the modem follow a strict

When the command parameter is omitted from the

format. Each command begins with the prefix AT. The

command string, it is assumed to be a 0.

command buffer stores the command line and executes

it upon receipt of a carriage return. Until executed, the

Escape Characters - A 3 character escape sequence

command line can be edited with the backspace key.

may be entered to switch the modem into command

mode while on line.

The escape character, set by

Command Prefix - Each command, except

the A/

command, begins with the AT prefix. The "A" and "T"

execute the escape. An AT command must then be

may be both upper case or both lower case but cannot be

entered within the period defined by S12 to enter

of different cases. The prefix identifies the speed and

command mode. The default escape sequence is "+++."

parity of the commands sent to the modem. The modem

determines data rate by measuring the width of the

Result Codes - The modem issues a result code after

incoming bits. Parity is determined by comparing the

each action. Result codes may be sent as full words,

parity bits of the "A" and the "T."

one or two digit numeric codes, or may be disabled all

together. 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.

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XE5620SM

XE5620SM AT Commands

An asterisk indicates the factory default

Qn - Responses

A - Answer Command -

n=0

Send responses *

n=1

No Responses

Bn - Select Communications Standard

n=0

Selects CCITT standards *

Sr? - Interrogate Register -

n=1

Selects Bell standards

Sr=n - Set Register Value -

D - Dial Command