XECOM XE5686L Datasheet
XECOM (1) XE5686L
XE5686L
12/00
Compact 56KBPS Data and Fax Modem
Description
Xecom's XE5686L combines high-speed data and
Group III send/receive fax in a compact component.
Xecom designed the XE5686L to be embedded by OEM
designers. Xecom also offers pin compatible 2400 BPS
14,400 BPS and 33,600 BPS alternatives to the
XE5686L for applications with other date rate
requirements.
The XE5686L is not a modem chip but a complete
modem including the telephone interface integrated into
a compact module. It provides user transferable FCC
Part 68 registration and can connect directly to the
telephone line through an RJ11 jack. The modem
connects to the host through a TTL level serial interface.
The XE5686L also includes MNP2-4, MNP10 and
V.42 error control and MNP5 and V.42bis data
compression to provide an error free connection with the
greatest possible data throughput rate.
Features
• Small Size; 1.385 " x 1.36" x 0.575"
• Modem control with "AT" commands
• Class 1 Fax commands
• Data transfer up to 56,000 bps
• Send and receive fax to 14,400 bps
• MNP and V.42 Error Control
• MNP10 Error Control for Cellular Links
• MNP5 Data Compression to 112,000 bps
• V.42bis Data Compression to 224,000 bps
• Low power, single +5V supply
Operating Power 800 mW (Typ.)
Sleep Mode 200 mW (Typ.)
• NVRAM for modem configuration storage
1
oo
22
2
oo
21
o
20
3
oo
19
4
oo
18
5
oo
17
6
oo
16
7
oo
15
8
oo
14
9
oo
13
10
oo
12
11
o
RING
TIP
N/C
N/C
SPK
N/C
N/C
N/C
N/C
TXD
RXD
RTS
RST
GND
VCC
N/C
/DCD
/CTS
/RI
/DSR
/DTR
/V-D
Modem
Controller
ROM NVRAM
Analog
Front End
DAA
Tip
Ring
Spk
Gnd
(Top View)
VCC
RST
TXD
RXD
/DCD
/CTS
/DSR
/DTR
/RTS
/V-D
Block Diagram
XE5686L Pin Configuration
XECOM (2) XE5686L
Dim Min Max Min Max
A 1.350 1.370 34.29 34.80
B 1.375 1.395 34.92 35.43
C 0.555 0.585 14.10 14.86
D 0.190 0.210 4.83 5.33
E 0.090 0.110 2.29 2.79
F 0.115 0.135 2.92 3.43
G 0.280 0.300 7.11 7.62
H 0.790 0.810 20.07 20.57
J 1.090 1.110 27.69 28.19
INCHES METRIC(MM)
A
B
C
E
F
G
G
H
D
Denotes Pin 1
J
F
Pins = 0.025 inches Square
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.
XE5686L Mechanical Specifications
XECOM (3) XE5686L
VCC
TXD
AMP
Host Serial
Interface
XE1486
3
4
RJ11
Ring
Tip
C1 C2
FB1
FB2
RXD
RST
Gnd
VCC
/DCD
/CTS
/RI
/DSR
/DTR
/V-D
Recommended Parts
Reference Designation Description Recommended Part Number
FB1, FB2 Ferrite Beads TDK CB30-1812
C1, C2 Capacitors Sprague 30GAT47, 470 pfd, 3000 Volts
Power Supply Characteristics(T
A
= 0 - 70°C, Vcc = 5v ±5%)
Vcc Supply Voltage 5.0 5.25 Volts
Icc Vcc Supply Current 160 180 mA Active, On Line
40 60 mA Sleep Mode
Symbol Parameter Typ Max Units Comments
XE5686L
XE5686L Typical Connection Diagram
XECOM (4) XE5686L
XE5686L Pin Descriptions
PIN NAME DESCRIPTION
1 Ring Ring provides half of the two-wire connection to the telephone network, RJ-11 Pin 4.
A 1500 volt barrier isolates Ring from all other circuits. This isolation must be preserved throughout the system. The battery voltage on Ring may be positive or negative
with respect to Tip.
2 Tip Tip provides half of the two-wire connection to the telephone network, 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 Not Used No Connection should be made to these pins.
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.
6-9 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 output 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 The XE5686L uses Clear to Send for hardware flow control. With hardware flow con-
trol active the modem raises \CTS to signal the host that the modem's transmit data
buffer is nearly full. When the buffer empties, the modem reactivates CTS.
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 N/C No Connection
19 VCC VCC provides the +5 volt power required by the modem.
20 GND Ground provides the common reference for the XE5686L.
21 RST This active high input causes a hardware reset in the XE5686L. The reset pulse must be held
high for at least 10 milliseconds to correctly reset the modem.
22 RTS The modem uses Request to Send for hardware flow control. The modem stops sending data to
the host when the hosts raises /RTS. The modem resumes transferring data to the host when the
host activates /RTS
XECOM (5) XE5686L
Parameter Min Typ Max Unit Comments
DTMF Level -2.2 0 dBm 3 second average
Modem Transmit Level -12 -10.5 -9.0 dBm 600 ohm line
Pulse Dialing Rate 10 pps
Pulse Dialing Make/Break 39/61 % USA
Billing Delay Interval 2.0 sec.
Phone Line Impedance Match 600 ohms
Ring Detect Sensitivity 38 150 VRMS Type B Ringer
Telephone Loop Current 20 100 milliamps Off-hook
Input High Voltage (TXD, RTS, DTR) 2.0 Volts
Input Low Voltage (TXD, RTS, DTR) 0.8 Volts
Output High Voltage 2.4 Volts RXD -100 microamps;
(DCD, DSR, CTS, RXD, RI, OH) DCD, RI, OH - 1.6 milliamps
Output Low Voltage 0.4 Volts RXD - 1.6 milliamps;
XE5686L Electrical Specifications (T
A
= 0 - 70°C, Vcc = 5v ±5%)
XECOM (6) XE5686L
Modes of Operation
The XE5686L has three operational modes; Command,
Fax and Data.
Data Mode: The XE5686L enters data mode after it
establishes a connection and issues a "CONNECT" result
code. In the Data Mode the modem sends all signals on
Transmit Data to the remote modem and puts data from
the remote modem onto Received Data for the host
equipment. When the modem exits data mode, it issues a
"NO CARRIER" result code.
Command Mode: The XE5686L enters command mode
on power-up, reset, loss of the connection, or receipt of
the escape sequence. In command mode the modem
accepts commands from the host on Transmit Data.
Appropriate result codes are returned on Received Data.
Fax Mode: The XE5686L enters Class 1 fax mode on
receipt of AT+FCLASS=1. In fax mode commands and
responses are issued at 19,200 bits per second; the
character format is 8 bits no parity. The modem accepts
fax commands only in fax mode. The A/, ATO, AT&T
and escape commands are not valid in fax mode.
Command Line Format
Commands sent to the modem follow a strict format.
Each command line begins with the prefix AT. The
modem stores the command line in the command buffer
and executes it upon receipt of a carriage return. Until
executed, a backspace edits the command line.
Command Prefix - The "A" and "T" command prefix
may be both upper or both lower case but cannot be of
different cases. The prefix identifies the speed and parity
of the host. The modem determines speed by measuring
the width of the incoming bits and parity by comparing
the parity bits of the "A" and "T." The XE5686L
normally sends result codes at the speed and parity
determined by the prefix.
Command Line - One command line may include
multiple commands. The modem executes commands in
the sequence they appear. Spaces inserted into the
command line do not fill space in the command buffer . A
carriage return terminates the command line and causes
the commands to be executed. Register S3 allows the
user to select a character other than a carriage return to
terminate the command line.
Command Buffer - The command buffer accepts only
40 characters, including the AT prefix. If the command
buffer overflows, the modem issues an "ERROR" result
code and does not execute the commands.
Command Line Editing - The backspace edits the
command line. Hitting the backspace key, or Control and
H simultaneously on some systems, erases the previous
character in the command line. All characters can be
erased except for the "A" and "T." Register S5 allows
the user to select a character other than a backspace to
edit the command line.
Re-Execute Last Command - The A/ command causes
the modem to re-execute the last command line. This is
the only command that does not require the "AT" prefix.
Omitted Parameters - Most commands include a parameter which determines the command function. If the
command omits the parameter, he modem assumes the
parameter is a zero.
Escape Characters - A three character escape sequence
switches the modem from data mode to command mode
while remaining on line. The escape character, set by
Register S2, must be entered 3 times in succession to
execute the escape. The default escape sequence is
"+++."
Result Codes - The modem issues a result code after
each action. The modem sends result codes as full
words, numeric codes or the user may disable the result
codes. Each result code ends with a carriage return when
the user chooses numeric result. The modem terminates
full word result codes with a Line Feed and Carriage
Return.
XE5686L AT Commands
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