XE5692SM
June 2005
Compact, Low-Cost Global Embedded V.92 Modem
Description
Features
The Xecom XE5692SM provides a complete,
global modem as a compact module. Only Xecom
XE5692SM-1 (Surface-Mount Model)
offers embedded modems in both through-hole and
surface-mount form.
XE5692SM: 2.175” x 1.0” x 0.30”
XE5692SM-1: 2.175” x 1.0” x 0.152”
User transferable FCC Part 68 registration comes
with every Xecom modem. This allows the system
designer to add a modem to a process control,
remote monitoring, point-of-sale, or remote
diagnostic system without Part 68 certification.
The XE5692SM footprint is 20% smaller than the
most popular embedded modems. The surface-
from interfering with voice communications.
mount version frees additional space on the bottom
of the application board. The space efficient design
configuration.
allows the development engineer greater flexibility
in placement of the modem within the host system.
Xecom offers two interchangeable models: the
XE5690SM and XE2422SM, that provide lower
cost, lower speed modem alternatives.
XE5692SM BLOCK DIAGRAM
NVRAM
/Reset
/TXD
/RXD
ROM
/RTS
/DSR
Modem
Global
/DCD
Controller
Analog
Telephone
Tip
/CTS
Front
Line
Ring
/DTR
End
Interface
/INT
(DAA)
SPKR
/RI
XECOM
(1)
XE5692SM
XE5692SM Mechanical Specifications (Through-Hole Version)
a
l
h
j
k
(Top View)
b
g
d
e
k
j
j
c
f
k
m
n
Inches
Millimeters
Dimension Min
Typ
Max
Min
Typ
Max
a
2.170
2.175
2.180
55.12
55.24
55.37
b
0.995
1.000
1.005
25.27
25.40
25.53
c
0.890
0.900
0.910
22.61
22.86
23.11
d
0.242
0.252
0.262
6.15
6.40
6.65
e
0.090
0.100
0.110
2.29
2.54
2.79
f
0.140
0.150
0.160
3.56
3.81
4.06
g
0.059
0.062
0.065
1.50
1.57
1.65
h
0.790
0.800
0.810
20.07
20.32
20.83
j
0.090
0.100
0.110
2.29
2.54
2.79
k
0.137 0.1375 0.138
3.48
3.49
3.51
l
1.230
1.240
1.250
31.24
31.50
31.75
m
1.490
1.500
1.510
37.85
38.10
38.35
n
0.290
0.300
0.310
7.37
7.62
7.87
XECOM
(2)
XE5692SM
XE5692SM-1 Mechanical Specifications (Surface-Mount Version)
a
h
e
f
g
d
b
c
(Top View)
g
f
f
g
j
k
Inches
Millimeters
Dimension Min
Typ
Max
Min
Typ
Max
a
2.170
2.175
2.180
55.12
55.24
55.37
b
0.995
1.000
1.005
25.27
25.40
25.53
c
0.890
0.900
0.910
22.61
22.86
23.11
d
0.142
0.152
0.162
3.61
3.86
4.11
e
0.790
0.800
0.810
20.07
20.32
20.83
f
0.090
0.100
0.110
2.29
2.54
2.79
g
0.137 0.1375 0.138
3.48
3.49
3.51
h
1.230
1.240
1.250
31.24
31.50
31.75
j
1.490
1.500
1.510
37.85
38.10
38.35
k
0.290
0.300
0.310
7.37
7.62
7.87
XECOM
(3)
XE5692SM
XE5692SM Pin Configuration
Top View
Tip
1
Ring
2
15
VCC
14
/DCD
13
/CTS
12
/DSR
11
/RTS
/INT
3
10
/RXD
/Reset
4
9
/TXD
SPKR
5
8
/DTR
Gnd
6
7
/RI
Pin Descriptions
PIN NAME
DESCRIPTION
1
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 XE5692SM operates regardless of the polarity of this
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 and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive points along the surface
2
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 XE5692SM operates regardless of the polarity of this
voltage. The “Battery” voltage drives up to 100 milliampere of DC loop current.
XECOM
(4)
XE5692SM
XE5692SM Pin Descriptions (continued)
PIN NAME
DESCRIPTION
UL60950 requires minimum creepage and clearances distances between the Tip and
Ring and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive points along the surface.
3
/INT
/INT provides an active low hardware interrupt signal from the XE5692SM. The
operation of this interrupt pin is programmable using the modem’s register U70.
4
/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.
5
SPKR
SPKR provides a Pulse Width Modulated version of the signal on Tip and Ring
allowing connection of a speaker to the modem to monitor modem operations. The
recommended speaker circuit is shown on Page 9 of this data sheet. The signal on
SPKR is controlled by the ATL and ATM commands.
6
Ground
Ground provides the reference voltage for all host interface signals.
7
/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.
8
/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.
9
/TXD
/TXD provides the path for transmitted data and modem commands to be passed
from the host controller to the modem.
10
/RXD
/RXD provides the path for received data and modem responses to be sent from the
modem to the host controller.
11
/RTS
/RTS is an active low input to the modem. When hardware flow control is set, an
active /RTS indicates to the modem that the host has data to send.
12
/DSR
/DSR is an active low output from the modem and is forced to the active condition.
13
/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.
14
/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
XE5692SM asserts /DCD.
15
VCC
VCC provides 3.3 volt power to the modem.
XECOM
(5)
XE5692SM
XE5692SM Electrical Specifications
Parameter
Min
Typ
Max
Units
Comments
VCC
3.13
3.3
3.47
Volts
ICC
30
35
mA
On Line
5
mA
Sleep
.14
mA
Power Down
Ring Voltage Detected
26
150
VRMS
Type B Ringer
Ring Frequency Detected
15.3
68
Hz
Type B Ringer
Telephone Loop Current
10
40
100
ma
Line Impedance
600
Ohms
Data Transmit level
-12.0
-9.0
dBm
DTMF Transmit Level
-2.5
0
dBm
Avg over 3 second interval
Voh
2.4
5.0
Volts
Vol
0.4
Volts
Vih
2.0
5.0
Volts
Vil
-0.3
0.8
Volts
XE5692SMABSOLUTE MAXIMUM RATINGS
Storage Temperature
-25 O C to +85 O C
1 Maximum Operating Temperature Range
0 O C to +70 O C
VCC
3.6 Volts
1 The XE5692SM can be ordered with an Operating Temperature of -40 O C to +85 O C at extra cost.
Order XE5692SM-ITR or XE5692SM-1ITR or to specify Industrial Temperature Range (ITR).
XECOM
(6)
XE5692SM
XE5692SM-1 Surface-Mount Soldering Instructions
The XE5692SM-1 is subject to damage if over-exposed to heat during solder reflow operations.
Following the soldering instructions below will ensure that the process of soldering the module to the
board does not damage the modem.
Maximum Temperature
220 O C
Maximum Time at 220 O C
20 Seconds
Maximum Time above Eutectic (180 O C)
90 Seconds
Maximum Preheat Dwell Time
180 Seconds
Maximum Recommended Solder Temperature Profile
220 O C
180 O C
150 O C
-20 sec-
------------------------------180secmax-------------------------
max
----- 90 sec max -----
XECOM
(7)
XE5692SM
XE5692SM Typical Connection Diagram
To Host Serial Port
VCC
RJ11
F1
(15) VCC
TIP(1)
(14) /DCD
RING (2)
(13) /CTS
(12) /DSR
C1
C2
(11) /RTS
(10)/RXD
/INT (3)
(9) /TXD
/RESET (4)
(8) /DTR
SPKR (5)
(7) /RI
Gnd (6)
To System Reset
To System Interrupt
Parts List for XE5692SMTypical Connection Diagram
Reference
Designation
Qty
Description
C1, C2
2
Cap. 1000 pfd, 1500V minimum
F1
1
PTC, TR600-150
Notes:
1 Capacitors, C1 and C2, may be required for EMI filtering in your system. Without these components
you may experience unintended radiation when the telephone cable is attached. C1 and C2 are high-
voltage capacitors. We recommend the Johanson Dielectrics 502S47N102KV6T. This 1000 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 is a positive thermal coefficient (PTC) device which protects the modem from excessive current
flow. These devices are required for your system to pass UL60950. Fuses may be used in place of the
PTC’s
XECOM
(8)
XE5692SM
Recommended SPKRConnection
The SPKR output on the XE5692SM provides a Pulse Width Modulated version of the signal on Tip and
Ring. This permits audio monitoring of modem operations through a connected speaker. The schematic
below shows the recommended circuit for the audio monitor
VCC
R1
6
C5
SPKR
3
+
U1
5
C1
R2
2
-
C2
C4
4
C3
R3
Speaker
Reference
Designation
Qty
Value
C1, C3, C4
3
0.1 ufd, 16 V + 20%
C2
1
820 pfd, 16V + 20%
C5
1
100 ufd, 16V + 20%
R1
1
47K, 1/10 W, + 5%
R2
1
10K, 1/10 W, + 5%
R3
1
140 ohm, 1/10 W, + 5%
U1
1
LM386
XECOM
(9)
XE5692SM
XE5692SM Shared Line Features
The XE5692SM can monitor telephone line
application including set top boxes and automated
conditions before, after and during calls. This
meter readers. For Handset Interrupt teh modem
allows the system to avoid conflicts with other
monitors the loop current while it is off-hook. The
equipment connected to the same telephone line.
Loop current will drop if a piece of equipment
There are two line monitoring modes; Connect
connected to the same telephone line goes off-
Detect and Handset Interrupt.
hook. The Handset Interrupt function is controlled
by registers U77 and U78. U78 defines when the
Connect Detect:
Handset Interrupt is operable, and U77 allows the
Connect Detect is active when the XE5692SM is
operator to configure the modem to disconnect
on-hook. With AT%V2 selected the XE5692SM
immediately upon detecting another piece of
verifies the availability of the telephone line by
equipment on the telephone line.
checking the DC loop voltage before going off-
hook for dialing or answering a call. The nominal
U77: Bit 11 of U77 sets the XE5692SM to
value of loop voltage is stored in register U85,
automatically disconnect any time another piece of
typically 48 volts. The XE5692SM can detect
equipment connects to the line while the modem is
either the lack of an installed telephone line or that
off-hook. This configuration is recommended when
the connected line is in use.
the modem will be sharing a line with a telephone
handset as it provides the quickest access to the
NO LINE If the telephone line is disconnected
phone line for emergency calls. If U77 bit 11 is not
from the modem, the voltage on Tip and Ring will
set, then U70 bit 10 should be. U70 bit 10 causes
be zero. If the modem reads a DC loop voltage of
the modem to provide an interrupt when the off-
3 volts or less, the modem will not go off-hook and
hook condition of the other equipment is detected.
will issue the “NO LINE” response.
U78 Bits 14 and 15 of U78 control when the
LINE IN USE If a telephone handset, fax
Handset Interrupt will be active.
machine or other piece of equipment connected to
the telephone line is in use, the DC loop voltage
disabled.
will drop. Typically the DC loop voltage will drop to
around 10 volts while the telephone line is in use. If
for a Handset Interrupt after dialing.
the modem sees a DC loop voltage between 3
volts and 85% of the nominal loop voltage (41
volts typical), the modem will not go off-hook but
Handset Interrupt when the timer set by bits 0 to
will transmit the “LINE IN USE” response
7 expires. Bits 0-7 set this timer in 500
millisecond increments.