Si2493/57/34/15/04 Global ISOmodem-EVB

Si2493/57/34/15/04 Global ISOmodem-EVB
Si2493/57/34/15/04
Global ISOmodem-EVB
Evaluation Board Rev 5.0 for the Si2493/57/34/15/04
ISOmodem with UART and SPI Interfaces
Description
The global Si2493/57/34/15/04-EVB evaluation board
Rev 5.0 provides the system designer an easy way of
evaluating the Si2493/57/34/15/04 ISOmodem®. The
Si2493/57/34/15/04-EVB consists of a motherboard
with a power supply, an RS-232 and USB interface,
other ease-of-use features, and a complete removable
modem module on a daughter card. (A functional block
diagram of the Si2493/57/34/15/04-EVB is shown
below.) The Si2493/57/34/15/04 ISOmodem is a
complete controller-based modem chipset with an
integrated
and
programmable
direct
access
arrangement (DAA) that meets global telephone line
requirements. Available as a combination of one 16-pin
small line-side device and one 24-pin or 16-pin systemside device, the Si2493/57/34/15/04 ISOmodem
eliminates the need for a separate DSP data pump,
modem controller, memories, codec, isolation
transformer, relays, opto-isolators, and a 2- to 4-wire
hybrid. The Si2493/57/34/15/04 is ideal for embedded
modem applications due to its small board area,
controller-based architecture, low power consumption,
and global compliance. The Si2493/57/34/15/04-EVB
provides an RJ-11 jack (for interfacing the Si2493/57/
34/15/04-EVB to the phone line), and USB and RS232
serial ports for interfacing to a PC or data terminal. This
allows the ISOmodem to operate as a serial modem for
straightforward evaluation of the Si2493/57/34/15/04. To
evaluate the Si2493/57/34/15/04 ISOmodem in an
embedded system, the daughter card can be used
independently of or with the motherboard.
A direct access header (J103) is available on the
motherboard to bypass the RS-232 transceivers and
connect the Si2493/57/34/15/04 ISOmodem directly to
a target system.
An on-board rectifier, filter, and voltage regulator allow
the power input to be 7.5–13 V ac or dc (either polarity)
supplied through a screw terminal (J8) or a standard
2 mm power jack (J9). Alternatively, power can be
supplied through the USB interface (whether the USB or
RS232 interface is used). The evaluation board can
drive an external speaker for call monitoring or the
speaker mounted directly on the board. Please note that
the PCM interface, parallel interface, and EEPROM are
available on the 24-pin FT only. See "1.7.EVB Part
Numbers" on page 8 for ISOmodem EVB options.
Features
The Si2493/57/34/15/04-EVB includes the following:
 Dual RJ-11 connection to phone line
 RS-232 and USB interface to PC
 Speaker for call monitoring
 Direct access to Si2493/57/34/15/04 for embedded
application evaluation
 Easy power connection to common 7.5 V–13.5 V
power supplies or USB port.
 9 V ac adaptor
 Simple installation and operation
 EEPROM (24-pin FT only)
 RS232 lines status display on LEDs.
Functional Block Diagram
Audio
Out
7.5-13.5 V dc or
peak ac Adaptor
Rectifier
Filter
Audio
Amplifier
Voltage
Regulator
3.3 V
Direct
Access HDR
Daughter Board Boundary
5V
USB
Connector
UART
USB I/F
DB9
RS-232
Transceivers
Interface
Selection
Jumpers
Phone
line
AOUT
Si2493/57/34/15/04
RESET XTALO
Si3018*
Interface
Circuit
RJ-11
XTALI
Push Button
Reset
Power-On
Reset
Rev. 0.7 4/11
*Si3010 for Si2404
Copyright © 2011 by Silicon Laboratories
Si2493/57/34/15/04-EVB
Si2493/57/34/15/04
Global ISOmodem-EVB
1. Si2493/57/34/15/04-EVB Setup and 1.3. Motherboard and Daughter Card
Configuration
Evaluation
This section explains how to set up the Si2493/57/34/
15/04-EVB for evaluation as an RS-232 or USB
interface modem. Jumper settings, power connection,
PC/terminal connections, and terminal program
configuration settings are given. The initial modem
setup after power is applied as well as a basic tutorial
on modem operation are provided. Si2493/57/34/15/04EVB configurations for evaluating additional features
are discussed separately. See the Si2493/57/34/15 or
Si2404 data sheets and “AN93: Si2493/57/34/15/04/04
Modem Designer’s Guide” for complete details.
1.1. Si2493/57/34/15/04-EVB Quick Start—
RS-232 Interface
1. Set jumpers according to Figure 1, but change J6 to the
arrangement shown in Figure 3 if an FS ISOmodem
package is used.
2. Connect:
DB-9
to PC COM 1 (with a pass-through cable).
to phone line or CO simulator.
9 V ac adaptor (or USB cable).
3. Bring up:
RJ-11
Turn
on power to modem.
automatically adjusts modem DTE speed and
protocol.
4. Type “AT” followed by a carriage return.
Autobaud
Should
echo “AT” and then an “OK”.
The EVB consist of a motherboard that takes a plug in
daughter card. The motherboard can be configured in a
variety of ways that are explained below and are
managed via jumpers. The daughter card contains both
the modem system side and the isolated line interface
(DAA).
The daughter card comes preconfigured and functional
although the user may decide to change some
operating options such as the type of crystal used with
the modem chip or the type of control signals used, i.e.
UART vs parallel. These features must be managed by
changing strapping resistors soldered down to the
daughter card and by changing parts associated with
the crystal. These possible changes are explained
below.
1.3.1. Motherboard Configuration
Check all the jumper setting on the S2493/57/34/15/04EVB before applying power. The standard factory
setting for the modem in a 24-pin FT package are
shown in the figure below. This setup configures the
modem for RS232 serial operation with autobaud
enabled. Any standard terminal program configured to
communicate through a PC com port can be used to
communicate with the EVB.
Figure 1 shows the default motherboard setup for the
FT package daughter card as well as the functions of
connectors and jumpers.
1.2. Si2493/57/34/15/04-EVB Quick Start—
USB Interface
1. Set jumpers according to Figure 3, but change J6 to the
arrangement shown in Figure 3 if an FS ISOmodem
package is used.
2. Connect:
USB
cable to PC
to phone line or CO simulator
3. Download USB driver for your operating system from the
CD supplied with the evaluation board.
RJ-11
4. Install driver.
5. Bring up.
Reset
the modem.
automatically adjusts modem DTE speed and
Autobaud
protocol.
6. Type “AT” followed by a carriage return.
Should
2
echo “AT” and then an “OK”.
Rev. 0.7
Rev. 0.7
LEDs and test
points showing
status of all
control lines as
well as TX/RX
RS232 com
port link to
Host
RS232 vs USB
select jumper,
JP23, with
RS232 select
shown.
(Remove to
disable both
modes).
USB,
virtual com
port link to
Host (J11)
Audio Power
amp (U27)
(Daughter card versions
prior to rev. 2.0 will not fit
this motherboard.)
Modem daughter cards
mate with J101 & JP2.
Remove JP12
Jumper to shut
down audio
power amp U27
Tests points (+3.3V
and Isense) that allow
modem current o tbe
measured via the 1.0
Ohm shunt: R59.
Insert jumper in
JP34 to run at a
fixed 19.2 kBaud
rate.
Figure 1. Default Motherboard Setup
Reset
Pushbutton
Insert JP33 & JP34
jumpers to enable
EEPROM
EEPROM
(U5)
System Connector.
Allows all modem
signals to be
probed or routed
elsewhere.
J6: Jumpers for control
line configuration.
Shown set up for a 24
pin modem on DC.
Tip and ring
signals available
at these test
points.
RJ11
Tel. Line
connectors.
Speaker
Output,
JP11
AC/DC Pwr
Inputs: J8
or J9.
Call progress
Speaker, and its
jumper JP14.
Si2493/57/34/15/04
Global ISOmodem-EVB
3
Si2493/57/34/15/04
Global ISOmodem-EVB
1.3.1.1. RS232 vs USB vs User Provided IO
Selection
To change to USB operation simply move the RS232
selection jumper on JP23 to the USB position as
marked on the PCB and shown in Figure 1. When the
USB vs UART settings are changed the appropriate
indicator LED will light up on the EVB.
Various modem control lines can be rearranged
depending on the user preferences and the specific
modem chips used. This is done using JP6. The basic
two JP6 configurations are shown in the following
figures.
J6
If neither jumper is in place then neither serial port will
be activated and the user must provide I/O signals via
the pins on J103. This IO can be in ASYNCH SERIAL,
SPI SERIAL and Parallel Bus mode.
1.3.1.2. Autobaud Control
Autobaud is enabled with no jumper at the JP34
position. When a jumper is in place, autobaud is
disabled and the user must setup the host to run 19k2
baud in order to use the modem.
1
3
4
6
7
9
10
12
13
15
1.3.1.3. EEPROM Control
Figure 2. Default J6 Setup for 24-Pin Modem
Chips
To enable the EEPROM (U5) both jumpers JP34 and
JP35 must be in place and the modem reset.
JP35 physically connects the EEPROM chips select
line to the modem and allows the EEPROM to function
when addressed by the modem, while JP34 connects a
strapping option to the correct modem pin which is
sensed during reset and instructs the modem firmware
to use the EEPROM.
J6
1
3
4
6
7
9
10
12
13
15
1.3.1.4. Call Progress Configuration
The modem call establishment can be heard by
enabling the call progress feature via software (see
AN93) and Hardware. The hardware components
include installing JP12 which enabled the audio power
amplifier and installing JP14 to connect the on board
speaker to the power amplifier output. If an offboard
speaker is to be used then JP14 can be removed and
the alternate speaker can be connected to pins 1 and 4
of JP11. Note the this audio output is 8  and
differential so that neither output pin should be
grounded.
Figure 3. Default J6 Setup for 16-Pin Modem
Chips
The specific details of what the jumpers connect are
shown in Table 1, which is also found printed on the
underside of the EVB.
1.3.1.5. Control Line Configuration
Table 1. Routing of Control Signals with Jumper Position on J6
RS232
Signal
4
Si24xx 24-Pin
Si24xx 16-Pin
Si2401
Left
Right
Left
Right
Left
Right
DCD
DCD
SDI/EESD
DCD
NC
DCD
NC
RI
RI
FSYNCH
NC
RI
NC
RI
DTR
ESC
RI
ESC
NC
ESC
NC
RTS
RTS
SDO/
EECLK
NC
RTS
NC
GPIO1
DSR
INT
AOUT/INT
NC
INT
NC
AOUT/INT
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
1.3.2. Daughter Card Configuration
The daughter card comes configured with either a 24pin FT or 16-pin FS system side part and either 32 kHz
or 4.9152 MHz operation, and UART operation. The
daughter card can also be setup to operate with a third
clock frequency, an on board 27 MHz oscillator. To
change between these options requires component
changes on the daughter card.
The daughter card can also operate in three possible
interface modes: parallel bus mode, in SPI mode as well
as the default UART mode.
There are six small (0402) strapping resistors (R101 to
R106) that are on the daughter card and are configured
differently depending on the combination of chip
package, clock frequency chosen, and interface mode.
See Figures 5 and 6 for details.
The card and its options are shown in Figure 4, which
shows the Modem Daughter card Rev 2.0 top and
bottom views with the critical parts that may be changed
to select another command mode (i.e. SPI) or an
alternate crystal frequency, such as 4.9152 MHz.
Rev. 0.7
5
Si2493/57/34/15/04
Global ISOmodem-EVB
Three possible crystals or ext oscillator.
These option strapping resistors select
modem command mode UART, SPI or
Parallel and crystal clock frequency.
Crystal loading caps (C40 & C41)
specific to the crystal type used.
TOP VIEW
BOTTOM VIEW
Figure 4. Modem Daughter Card Rev 2.0 Top and Bottom Views
Figure 5. R101–R106 Setup for Clock and Mode Configuration on the DC with the 16-Pin FS
Package
6
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
Figure 6. R106 Setup for Clock and Mode Configuration on DC with 24-Pin FT Package
1.3.2.1. 32 kHz Setup
Table 2. Signal Usage
For 32 kHz, populate Y1 with the 32 kHZ crystal shown
in the BOM and use 18 pF capacitors for the C40/C41
values. Also remove Y3 and Y1b if present and strap
R101 to R106 as shown in Figure 5.
SPI Function
JP23 Pin Number
Legacy Pin
Function
SPI_CSb
5
RTSb
The modem should then work as expected; no changes
are needed on the motherboard
SPI_MISO
7
RXD
SPI_MOSI
9
TXD
SPI_SCLK
11
CTSb
1.3.2.2. 4.9152 MHz
For 4.9152 MHz, populate Y1b with the 4.9152 MHz
crystal shown in the BOM and use 33 pF capacitors for
the C40 and C41 values. Also remove Y3 and Y1 if
present and strap R101 to R106 as shown in Figures 5
or 6 above.The modem should then work as expected;
no changes are needed on the motherboard
1.3.2.3. 27 MHz
For 27 MHz, populate Y3 with the small surface mount
oscillator shown in the BOM and remove Y3 and Y1b if
present. Also remove any capacitors at the C40 and
C41 positions.
Strap R101 to R106 as shown in Figures 5 or 6 above.
The modem should then work as expected; no changes
are needed on the motherboard
1.3.2.4. SPI Mode Setup
To change to SPI mode setup it is necessary to
configure the R101 straps as shown in Figure 5 or
Figure 6, according to the package and clock used.
Then setup the daughter card with neither UART nor
USB operation selected, i.e. with no jumper on JP23.
The SPI signals can then be obtained on J103, the
system connector and connected to the host. Signal
usage is described in Table 2.
1.3.3. Parallel Bus Mode Setup
To change to parallel bus mode setup it is necessary to
configure the R101 straps as shown in Figure 5 or
Figure 6, according to the package and clock used.
Then setup the daughter card with neither UART nor
USB operation selected, i.e. with no jumper on JP23.
The SPI signals can then be obtained on J103, the
system connector and connected to the host. See the
data sheet and schematic for signal and pin usage.
1.4. Power Requirements
The Si2493/57/34/15/04-EVB has an on-board diode
bridge, filter capacitor, and voltage regulator (U10 and
U18). Power can be supplied from any source capable
of providing 7.5 V–13 V dc or 7.5 V–13 V peak ac and
at least 100 mA. (Additional current may be required if a
speaker is connected for monitoring call progress
tones.) Power may be applied to the Si2493/57/34/15/
04-EVB through the screw terminals (J8), the 2 mm
power jack (J9), or the USB cable (even if the modem is
configured for RS-232 operation). The onboard fullwave rectifier and filter ensure the correct polarity is
applied to the Si2493/57/34/15/04-EVB. Daughter card
current can be measured by connecting a DVM across
R59, a 1  resistor using the supplied test points on
Rev. 0.7
7
Si2493/57/34/15/04
Global ISOmodem-EVB
either side.
the data mode. After the ATO command, the modem
resumes the data connection and no longer accepts AT
commands.
1.5. Terminal and Line Connections
The Si2493/57/34/15/04 can be tested as a standard
serial data modem by connecting the Si2493/57/34/15/
04-EVB to a personal computer or other data terminal
equipment (DTE), phone line, and power. Connect a PC
serial port to the DB9 connector on the Si2493/57/34/
15/04-EVB with a pass-through cable. The RS-232
transceivers on the EVB can communicate with the DTE
at rates up to 1 Mbps. Any standard terminal program,
such as HyperTerminal or ProComm, running on a PC
communicates with the Si2493/57/34/15/04-EVB. The
standard factory jumper configuration has autobaud
enabled. Autobaud detects the DTE speed, data length,
parity, and number of stop bits.
If JP33 is installed, autobaud is disabled. Configure the
terminal emulation program to 19200 bps, eight data
bits, no parity, one stop bit, and hardware (CTS)
handshaking. Connect the RJ-11 jack on the Si2493/57/
34/15/04-EVB to an analog phone line or telephone line
simulator, such as a Teltone TLS 5.
1.6. Making Connections
With the terminal program properly configured and
running, apply power to the Si2493/57/34/15/04-EVB.
Type “AT<cr>”, and the modem should return “OK”
indicating the modem is working in the command mode
and communicating with the terminal. If the “OK”
response is not received, try resetting the modem by
pressing the manual reset switch (S1); then, again type
“AT<cr>.” Next, type “ATI6<cr>.” The modem should
respond with “2493”, “2457”, “2434”, “2415”, or “2404”
indicating the terminal is communicating with an Si2493,
Si2457, Si2434, Si2415, or Si2404.
Type “ATS0=2<cr>” to configure the modem to answer
on the second ring.
To take the modem off-hook, type “ATH1<cr>.” The
modem should go to the off-hook state, draw loop
current, and respond with an “OK.” Next, type
“ATH<cr>” or “ATH0<cr>”, and the modem should hang
up (go on-hook) and stop drawing loop current.
To make a modem connection, type “ATDT(called
modem phone number)<cr>.” Once the connection is
established, a “CONNECT” message appears indicating
the two modems are in the data mode and
communicating. Typing on one terminal should appear
on the other terminal. To return to the command mode
without interrupting the connection between the two
modems, type “+++.” Approximately two seconds later,
“OK” appears. The modem is now in command mode
and accepts “AT” commands.Type “ATH” (or “ATH0”) to
terminate the data connection, or type “ATO” to return to
8
1.7. EVB Part Numbers
The ISOmodem evaluation boards are offered in
multiple speeds and packaging options. The first four
numbers indicate the system-side device. The next two
letters indicate the system-side package (FS–Lead-free,
16-pin SOIC; FT–Lead-free, 24-pin TSSOP). The final
two numbers indicate the line-side device. See Figure 7.
Si2457-D-FS18-EVB
LS Part Number (Si30xx)
SS Package
SS Revision
SS Part Number
Figure 7. EVB Part Number Example
2. Si2493/57/34/15/04-EVB
Functional Description
The Si2493/57/34/15/04-EVB is a multipurpose
evaluation system. The modem daughter card
illustrates the small size and few components required
to implement an entire controller-based modem with
global compatibility. The daughter card can be used
independently of, or in conjunction with, the
motherboard. The motherboard adds features that
enhance the ease of evaluating the many capabilities of
the Si2493/57/34/15/04 ISOmodem®.
2.1. Motherboard
The motherboard provides a convenient interface to the
Si2493/57/34/15/04 DC (daughter card). The versatile
power supply allows for a wide range of ac and dc
voltages to power the board. RS-232 transceivers and a
DB9 connector allow the Si2493/57/34/15/04-EVB to be
easily connected to a PC or other terminal device.
Jumper options allow direct access to the LVCMOS/TTL
level serial inputs to the Si2493/57/34/15/04, bypassing
the RS-232 transceivers or USB interface. This is
particularly useful for directly connecting the Si2493/57/
34/15/04 to embedded systems.
The Si24xxURT-EVB motherboard connects to the
daughter card through two connectors, JP101 and JP2.
JP101 is an 8x2 header providing connection to all
Si2493/57/34/15/04 digital signals and regulated 3.3 V
power for the Si2493/57/34/15/04. The Si2493/57/34/
15/04 digital signals appearing at JP101 (daughter card
interface) are LVCMOS and TTL compatible. JP2 is a
4x1 socket providing connection between the daughter
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
card and the RJ-11 phone jack.
2.1.5. EEPROM Enable (FT Only)
2.1.1. Voltage Regulator/Power Supply
Connecting JP34 and JP35 enables the optional
EEPROM, U5. See “AN93: Si2457/Si2434/Si2415/
Si2404 Modem Designer’s Guide” for programming
details.
The input voltage to either J8 or J9 must be between 7.5
and 13.5 V dc or 7.5 and 13.5 VPEAK ac. The
motherboard includes a diode bridge (D12) to guard
against a polarity reversal of the dc voltage or to rectify
an ac voltage. The power source must be capable of
continuously supplying at least 100 mA. C44 serves as
a filter cap for an ac input. The voltage regulator, U10,
provides 5 V for the motherboard and the input for
voltage regulator U3, which outputs 3.3 V for use on the
motherboard and to power the daughter card. Si24xxDC
power consumption can be measured by placing a
meter across R59. Power is supplied to U2 through D5
from the USB.
2.1.2. Reset Circuitry
The Si2493/57/34/15/04 requires a reset pulse to
remain low for at least 5.0 ms after the power supply
has stabilized during the powerup sequence or for at
least 5.0 ms during a power-on reset. Most production
Si2493/57/34/15/04 modem chipset applications require
that RESET be controlled by the host processor. Certain
Si2493/57/34/15/04
operation
modes,
including
powerdown, require a hardware reset to recover.
The Si2493/57/34/15/04-EVB contains two reset
options, an automatic power-on reset device, U18
(DS1818) (default), and a manual reset switch (S1) to
permit resetting the chip without removing power. A
reset, regardless of the mechanism, causes all modem
settings to revert to factory default values.
2.1.3. Automatic Reset (DS1818)
The DS1818 is a small, low-cost device that monitors
the voltage on VD and an external reset pushbutton. If
VD drops below 3.0 V, the DS1818 provides a 220 ms
active-low reset pulse. On powerup, the DS1818 also
outputs an active low reset pulse for 220 ms after VD
reaches 90% of the nominal 3.3 V value. The DS1818
outputs a 220 ms reset pulse any time the power supply
voltage exceeds the 3.3 V ±10% window.
2.1.6. Interface Selection
The serial interface of the Si2493/57/34/15/04-EVB can
be connected to a computer, terminal, embedded
system, or any other data terminal equipment (DTE) via
a standard RS-232 interface, USB interface, or through
a direct TTL serial interface.
The Si2493/57/34/15/04 can be tested as a standard
data modem by connecting the Si2493/57/34/15/04EVB to a personal computer or other DTE power supply
and a phone line. A PC can communicate with the
Si2493/57/34/15/04-EVB using a standard terminal
program, such as HyperTerm or ProComm.
Jumper settings determine how the Si2493/57/34/15/
04-EVB is connected to the DTE.
2.1.7. RS-232 Interface
This operation mode uses the standard factory jumper
settings illustrated in Figure 1 on page 3. The Maxim
MAX3237 transceiver interfaces directly with the TTL
levels available at the serial interface of the Si2493/57/
34/15/04 and, using internal charge pumps, makes
these signals compatible with the RS-232 standard. The
RS-232 transceiver on the Si2493/57/34/15/04-EVB can
communicate at rates between 300 bps and 1 Mbps.
This simplifies the connection to PCs and other data
terminal equipment (DTE). The signals available on the
Si2493/57/34/15/04-EVB
serial
interface
(DB9
connector) are listed in Table 3.
2.1.8. USB Interface
The USB cable connects to J10 on the motherboard
and provides both data and power. Installing a jumper
on JP23 enables the USB interface and disables the
RS-232 interface. The USB interface is provided by
U12. A USB driver for this chip is available for most PC
and MAC operating systems on the CD.
2.1.4. Manual Reset
The manual reset switch (S1) performs a power-on
reset. This resets the Si2493/57/34/15/04 to factory
defaults without turning off power. Pressing S1 activates
the reset monitor in the DS1818 and produces a 220 ms
active low reset pulse.
Rev. 0.7
9
Si2493/57/34/15/04
Global ISOmodem-EVB
2.1.9. Direct Access Interface
operation of the modem. See “AN93: Si3457/34/15/04
Modem Designer’s Guide” for more details on the
features controlled by pin strapping.
While the motherboard supplies power through J8, J9,
or USB, power-on reset, and an RJ–11 jack for the
modem, the direct access interface (J103) is used to
connect the motherboard to an embedded system. J103
provides access to all Si2493/57/34/15/04 signals
available on the daughter card.
Since this PWM signal swings rail to rail and is simply
filtered by a low pass filter to acquire the audio. It is
important to keep the power supply to the modem free
of noise in the audio spectrum.
It is necessary to remove the jumper on JP23 to disable
both the RS-232 and USB interface and prevent signal
contention.
2.1.11.2. The Audio Output Amplifier (LM4819)
The Power amplifier on the EVB is powered by a current
limited 4.2 V supply. The current limit is implemented in
the EVB because it is intended for HW/SW
development and is not needed for a production design.
This amplifier can drive an 8  speaker with 200 mW of
Call progress audio (i.e., ISOmodem's call progress
dialing and negotiation tones).
2.1.10. PCM Interface (24-Pin FT Only)
The Si2493/57/34/15/04 PCM interface can be
demonstrated using the voice motherboard, not with this
EVB.
2.1.11. AOUT Call Progress Audio Output
The power amplifier itself is a low cost, rugged H bridge
type device. There are several pin compatible designs
from multiple vendors that can provide alternate price/
power tradeoffs for this amplifier. This power amp can
be shut down by removing jumper JP12. The signal at
JP12 can also be tied to a control signal to allow the
host to shut down the amplifier. The customer can
change the values of R172 and R173 when integrating
the EVB to his system, but should keep the RC formed
by C37 and R173 at a 50 Hz or higher corner to avoid a
power-on thump.
Call progress audio output is provided by the Si2493/57/
34/15/04 on the AOUT pin as a PWM signal. This signal
allows the user to monitor call progress signals, such as
dial tone, DTMF dialing, ring, busy signals, and modem
negotiation. Control of this signal is provided by AT
commands and register settings described in the
introduction. The AOUT signal is connected to an on
board amplifier, for a high-quality output. AOUT can
also be connected to a summing amplifier or multiplexer
in an embedded application as part of an integrated
audio system.
2.1.11.3. The Call Progress Speaker
2.1.11.1. AOUT Audio Processing
The Call progress speaker, Regal RE-2308-NL is
connected to the amplifier via a jumper, JP14. If another
speaker is to be connected then it is necessary to
remove JP14 and connect the external speaker to JP11,
Pins 1 and 4. It is important to remember that the
speaker signal is differential. Both the output pins are
driven outputs and must not be grounded.
The AOUT signal discussed in this section leaves the
Si2493/57/34/15/04 is processed (demodulated) by a
high pass filter: (R133,134,135, and C24, C25, 26,
C27). It is critically important to not put a dc load on the
AOUT pin since the pin also acts as a modem feature
control on reset and is internally weakly pulled up. Any
unintentional dc load on AOUT prevents proper
Table 3. DB9 Pin Connections
J1 Name
J1 Symbol
J1 Pin
Carrier Detect
CD
1*
See note
DCD/EESD
Received Data
RXD
2
9
RXD
Transmit Data
TXD
3
10
TXD
Data Terminal Ready
DTR
4*
See note
ESC/RI
SG
5
6
GND
Data Set Ready
DSR
6*
See note
INT/AOUT
Ready to Send
RTS
7*
See note
RTS/RXCLK
Clear to Send
CTS
8
11
CTS
*
17
RI
Signal Ground
Ring Indicator
RD
9
*Note: JP6 jumper option.
10
Rev. 0.7
Si2493/57/34/15/ Si2493/57/34/15/
04 Pin
04 Name
Si2493/57/34/15/04
Global ISOmodem-EVB
2.2. Modem Daughter Card Operation
The Si2493/57/34/15/04URT-EVB daughter card is a
complete modem solution perfectly suited for use in an
embedded system. The daughtercard contains both the
modem system-side chip and the isolated line interface
(DAA).
The daughter card requires a 3.3 V supply capable of
providing at least 35 mA and communicates with the
system via LVCMOS/TTL-compatible digital signals on
JP1. The RJ-11 jack (TIP and RING) is connected via
JP2. Be sure to provide the proper power-on reset pulse
to the daughter card if it is used in the stand-alone
mode.
2.2.1. Reset Requirements
The Si2493/57/34/15/04 ISOmodem® daughter card
must be properly reset at powerup. The reset pin (pin 8)
of the Si2493/57/34/15/04 (JP103, J101 pin 13) must be
held low for at least 5.0 ms after power is applied and
stabilized to ensure the device is properly reset.
2.2.2. Crystal Requirements
Clock accuracy and stability are important in modem
applications. To ensure reliable communication between
modems, the clock must remain within ±100 ppm of the
design value over the life of the modem. The crystal
selected for use in a modem application must have a
frequency tolerance of less than ±100 ppm for the
combination of initial frequency tolerance, drift over the
normal operating temperature range, and five year
aging. Other considerations, such as production
variations in PC board capacitance and the tolerance of
loading capacitors, must also be taken into account.
2.2.3. Protection
The Si2493/57/34/15/04-EVB meets or exceeds all FCC
and
international
PTT
requirements
and
recommendations for high-voltage surge and isolation
testing without any modification. The protection/isolation
circuitry includes C1, C2, C8, C9, FB1, FB2, and RV1.
The PCB layout is also a key “component” in the
protection circuitry. The Si2493/57/34/15/04-EVB
provides isolation to 3 kV. Contact Silicon Laboratories
for information about designing to higher levels of
isolation.
Rev. 0.7
11
RTSb
CTSb
AOUT_INTb
FSYNCH
INTb
RIb
DCDb
12
8
9
10
11
U12
R101
R102
R103
R104
R105
R106
Rev. 0.7
No
Yes
No
Yes
No
No
No
Yes
Yes
No
Yes
No
X
X
Yes
No
Yes
SPI 4.9252 MHz
UART 32 kHz
SPI 27 MHz
SPI 32 kHz
No
Yes
No
No
2
OUT
VCC
3
4
VDD
C55
0.1uF
X
X
No
No
No
Yes
Yes
Yes
X
X
No
No
Yes
No
Yes
No
X
X
Yes
No
X
No
X
Yes
Pin17 Pin23
RIb
DCDb
R105 R106
27 Mhz
32.768 kHz
4.9152 MHz
Parallel 4.9152 MHz
Parallel 27 Mhz
UART 27 Mhz
UART 4.9152 MHz
UART 32.768 kHz
SPI
SPI
SPI
8
XTALI
VDD
C54
1uF
R18
FB5
U13
Si24xx-16 pin
33pF
RIb
R120
9
10
NI
NI
1
3
5
7
9
11
13
15
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
2
4
6
8
10
12
14
16
SOCKET 8x2
J1
ESC
SDI_EESD
RIb
INTb
AOUT_INTb
SDO_EECLK_RTSb
DCDb
These components are for
internal Silabs use only.
C2A
C1A
XTALO
2
SDI_EESD R121
C2A
C1A
XTALO
XTALI
C52
0.1uF
1
C50
0.1uF
CLKIN/XTALI
CLKOUT_EECSb_AO
FSYNCH
RTSb
RXD
R110
200
TXD
R111
200
CTSb
R112
200
RESETb
C40
C41
33pF
RESET
C56
0.1uF
1.2K
VDD
RTSb_SPI_CSb
RXD_SPI_MISO
TXD_SPI_MOSI
CTSb_SPI_SCLK
DCDb
ESC
RIb
INTb
VA
Y1B
Y1
32.768KHz 4.9152MHz
XTALO
RESETb
<<%<DUHDOWHUQDWHIRRWSULQWVDQGIUHTXHQFLHV
7KH9DOXHVRI&&YDU\6HH7KH%20
GND
NC
Y3
27 MHz
C2A
C1A
16
5
6
7
15
14
3
11
VDA 13
SDO_EECLK_RTSb
RXD
TXD
CTSb
DCDb
ESC
FSYNCH
AOUT_INTb
C51
0.22uF
Figure 8. i2493/57/34/15/04 Schematic
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
UART 27 MHz
No
No
UART 4.9152 MHz
No
No
No
13
Pin15
Pin16
AOUT_INTb INTb
R102
R104
Pin11
Pin3
Pin15
AOUT_INTb FSYNCH(RI) DCDb
R102
R103
R106
Pin11
CTSb
R101
Pin7
CTSb
R101
10K
10K
10K
10K
10K
10K
1
XTALO
2
14
XTALI
1
2QO\RQH6\VWHPVLGHSDUWLV
VROGHUHGDWWLPH8RU8
24 pin system side strapping table
C2A
RESET
C1A
RTSb/SPI_CSb/D7
RXD/SPI_MISO/RDb
TXD/SPI_MOSI/WRb
CTS/SPI_SCLK/CSb
XTALO
CLKIN/XTALI
Si2493
CLKOUT/EECSb/A0
INTb/D0
RIb/D1
SDI/EESD/D2
SDO/EECLK/D5
DCDb/D4
ESC/D3
AOUT/INTb
FSYNCH/D6
VDB
VDA
16 pin sys side strapping table
PKG_16.7 & PKG_24.11
PKG_16.11 & PKG_24.15
PKG_16.3 & PKG_24.4
PKG_24.16
PKG_24.17
PKG_16.15 & PKG_24.23
RESETb
RXD
TXD
CTSb
3
16
17
18
INTb
RIb
SDI_EESD
CLKOUT_EECSb_AO
24
23
22
15
4
VDB 19
7
C53
0.22uF
SDO_EECLK_RTSb
DCDb
ESC
AOUT_INTb
FSYNCH
VDA
VDD
4
VDD3.3
5
21
VD3.3
VD 3.3
GND
GND
6
20
GND
12
12
:LUHVFRPPRQWR
SLQSDUWV
Si2493/57/34/15/04
Global ISOmodem-EVB
3. Design
The following sections contain the schematics, bill of materials, and layout for the Si2493/57/34/15/04 including the
daughter card and motherboard.
C2A
C1A
56.2
R13
56.2
R12
1M
R9
Bias
C2
C1
C6
10
7
4
6
5
0.1uF 0.1uF
C0603 C0603
C5
33pF
33pF
QB
DCT2
DCT3
DCT
RX
VREG2
14
2
3
R1
1.07K
8
9
1
12
13
16
20M
20M
R4
2.49K
100K
R5
3.65K
R3
Q1
MMBTA42LT1
I_GND
Z1
43V
0.01uF
C10
0.01uF
C3
+
-
I_GND
D1
HD04
Figure 9. Si3018/10 DAA Schematic
Keep 5 mm creepage
rules between this DAA
section and all else.
I_GND
100K
R6
Place C3 near D1
Q3
MMBTA42LT1
Q2
MMBTA92LT1
Add 0.020 to 0.030 sq.
inches of Cu at all
transistor collectors
Ring Detect/CID/Voltage monitoring
No GND or I_GND
copper planes in DAA
section.
R7
R8
150
R2
73.2
R11
DC Term
2.7nF
Q4
MMBTA06LT1
R10
536
C4
1uF
C7
Q5
MMBTA06LT1
I_GND
RNG1
RNG2
QE
QE2
Si3018
VREG
IB
C2B
C1B
U2
IGND
15
Rev. 0.7
SC
+
11
1uF C4X
X8R 25V
C9
680pF
600 Ohm
FB1
600 Ohm
FB2
C8
680pF
R15
0
P3100SB
RV1
R16
0
TIP
RING
J2
TSM-104-01-T-SV
4X1 Header
Si2493/57/34/15/04
Global ISOmodem-EVB
13
Si2493/57/34/15/04
Global ISOmodem-EVB
4. Bill of Materials: Si24xx Daughter Card
Table 4. Si24xx Daughter Card Bill of Materials
Item
Qty
Ref
Value
Rating
1
2
2
1
C1, C2
33 pF
Y2
C3
0.01 µF
Voltage
Tol
Type
PCB Footprint
Mfr Part Number
Mfr
250 V
±10%
Y2
C1808
SCC1808X330K502T
Holy Stone
250 V
±10%
X7R
C0805
GRM21BR72E103KW03L
Murata
3
1
C4
1 µF
50 V
±20%
Alum_Elec
C3.3X3.3MM
EEE1HS010SR
Panasonic
4
2
C5, C6
0.1 µF
16 V
±20%
X7R
C0603
C0603X7R160-104M
Venkel
5
1
C7
2.7 nF
50 V
±20%
X7R
C0603
C0603X7R500-272M
Venkel
6
2
C8, C9
680 pF
250 V
±10%
Y2
C1808
SCC1808X681K502T
Holy Stone
7
1
C10
0.01 µF
16 V
±20%
X7R
C0603
C0603X7R160-103M
Venkel
8
2
C40,
C41
18 pF
50 V
±5%
COG
C0603
C0603COG500-180J
Venkel
9
3
C50,
C52,
C56
0.1 µF
10 V
±20%
X7R
C0603
C0603X7R100-104M
Venkel
10
2
C51,
C53
0.22 µF
6.3 V
±10%
X5R
C0603
C0603X7R6R3-224K
Venkel
11
1
C54
1 µF
25 V
±10%
X5R
C0603
C0603X5R250-105K
Venkel
12
1
D1
HD04
0.8 A
BRIDGE
MiniDIP4
HD04-T
Diodes Inc.
13
3
FB1,
FB2,
FB5
600 
200 mA
SMT
L0603
BLM18AG601SN1
Murata
14
1
J1
SOCKET 8x2
SOCKET
SOCKETX8-100-SMT
SSW-108-22-G-D-VS
Samtec
15
1
J2
4X1 Header_0
CONN1X4-100-SMT
TSM-104-01-T-SV
Berg
16
2
Q1 Q3
MMBTA42LT1
SOT23-BEC
MMBTA42LT1
On Semi
Y2
400 V
200 mA
300 V
NPN
17
1
Q2
MMBTA92LT1
100 mA
300 V
PNP
SOT23-BEC
MMBTA92LT1
On Semi
18
2
Q4 Q5
MMBTA06LT1
500 mA
80 V
NPN
SOT23-BEC
MMBTA06LT1
On Semi
19
1
RV1
P3100SB
275 V
Sidactor
DO-214AA-NP
P3100SBL
Littelfuse
20
1
R1
1.07 k
1/2 W
±1%
ThickFilm
R2010
CR2010-2W-1071F
Venkel
21
1
R2
150 
1/16 W
±5%
ThickFilm
R0603
CR0603-16W-151J
Venkel
22
1
R3
3.65 k
1/2 W
±1%
ThickFilm
R2010
CR2010-2W-3651F
Venkel
23
1
R4
2.49 k
1/2 W
±1%
ThickFilm
R2010
CR2010-2W-2491F
Venkel
24
2
R5, R6
100 k
1/16 W
±5%
ThickFilm
R0603
CR0603-16W-104J
Venkel
25
2
R7, R8
20 M
1/8 W
±5%
ThickFilm
R0805
CR0805-8W-206J
Venkel
26
1
R9
1 M
1/16 W
±1%
ThickFilm
R0603
CR0603-16W-1004F
Venkel
27
1
R10
536 
1/4 W
±1%
ThickFilm
R1206
CR1206-4W-5360F
Venkel
28
1
R11
73.2 
1/2 W
±1%
ThickFilm
R2010
CR2010-2W-73R2F
Venkel
29
2
R12,
R13
56.2 
1/16 W
±1%
ThickFilm
R0603
CR0603-16W-56R2F
Venkel
30
2
R15,
R16
0
1A
ThickFilm
R0603
CR0603-16W-000
Venkel
31
2
R120,
R121
0
1A
ThickFilm
R0603
CR0603-16W-000
Venkel
32
1
R18
1.2 k
1/10 W
±5%
ThickFilm
R0603
CR0603-10W-121J
Venkel
33
4
R101,
R102,
R103,
R104,
R106
10 k
1/10 W
±5%
ThickFilm
R0603
CR0603-10W-103J
Venkel
14
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
Table 4. Si24xx Daughter Card Bill of Materials (Continued)
Item
Qty
Ref
Value
Rating
Voltage
Tol
Type
PCB Footprint
Mfr Part Number
Mfr
34
1
R105
1 k
1/10 W
±5%
ThickFilm
R0603
CR0603-10W-102J
Venkel
35
3
R110,
R111,
R112
200 
1/10 W
±5%
ThickFilm
R0603
CR0603-10W-2000J
Venkel
36
1
U2
Si3018
LineSide
SO16N6.0P1.27
Si3018-F-GS
SiLabs
37
1
U12
Si24xx
ISOMODEM
TSSOP24N6.4P0.65
Si2493-E-FT
SiLabs
38
1
U13
Si24xx-16 pin
16pin SOIC
2493
Silicon
Laboratories
39
1
Y1B
(Y1, Y3)
32.768 kHz
XTAL-3X8-LD
ECS–.327–12.5–8X
ECS
International
40
1
Z1
43 V
SOD-123
BZT52C43-7-F
Diodes Inc.
300 V
500 mW
43 V
Zener
Rev. 0.7
15
+3.3V
R162
RED
RED
JP23
RS232
D53
10K
10K
D52
USB
15
1
4
7
9
12
0.1uF
1uF
C69
1A
2A
3A
4A
Net names correspond to Si24xx.
See table for Si2401 equivalents
+3.3V
15
1
4
7
9
12
0.1uF
RI_M
DTR_M
RTS_M
DSR_M
RXD
TXD
CTSb
CD_M
SPI mode
SPI_CSb
C70
560pF
U13
IDT74CBTLV3257
ENABLE_MUXb
SELECT
BAV23A
D54
R40
10K
OE
S
Si2401
NC
GPIO1
GPIO5
GPIO2
NC
GND
RXD
GPIO3
TXD
NC
CTS
NC
RESETb
NC
VD
GPIO4
1B2
2B2
3B2
4B2
1B1
2B1
3B1
4B1
C72
Select
High
Chooses
+3.3V B2 port
1B2
2B2
3B2
4B2
1A
2A
3A
4A
C71
OE
S
+3.3V
Isense
RED
TP13
1B1
2B1
3B1
4B1
U14
IDT74CBTLV3257
3
6
10
13
2
5
11
14
3
6
10
13
2
5
11
14
1.0
Si24xx
CLKOUT/EECS/A0
SDO/EECLK_RTSb/D5
FSYNCH/D6
DCDb/D4
RTSb/D7
GND
RXD/RD
ESC/D3
TXD/WR
SDI/EESD/D2
CTSb/CS
RIb/D1
RESETb
INTb/D0
VD
AOUT/INTb
R163
R42
"RS232"
"USB"
R41
JP1/3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
681
681
RI_T
DTR_T
RTS_T
DSR_T
RI_U
DTR_U
RTS_U
DSR_U
RXD_T
TXD_T
CTS_T
CD_T
RXD_U
TXD_U
CTS_U
CD_U
To Host
Interface Page
RESETb
+3.3V
RED
TP12
16
VCC
GND
8
16
VCC
GND
8
+3.3V
G1
G2
A1
A2
A3
A4
A5
A6
A7
A8
+3.3V
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
C75
INTb
RTSb
ESC
RIb
DCD
24xx
TSSOP24
U26
74LCX541
18
17
16
15
14
13
12
11
0.1uF
ESC
RIb
RTSb
RTS_M
INTb
DSR_M
DTR_M
RI_M
CD_M
DCDb
Table on back
silkscreen for
JP6
+3.3V
2
4
6
8
10
12
14
16
2
4
6
8
10
12
14
16
2
4
6
8
10
12
14
16
Silk Screen Text
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
J103
8X2 Shrouded Header
TP23
TP22
TP21
TP20
TP19
TP17
TP16
R170
R169
R160
R159
R158
R157
R156
R155
AOUT_INTb
681
681
681
681
681
681
681
681
DSR
RTS
DTR
RI
CD
CTS
TXD
RXD
D48
D47
D46
D45
D44
D43
D42
D41
RED
AOUT/INTb
INTb
NC
RIb
NC
24xx
SOIC16
RTSb
RIb
FSYNCH
SDI/EESD
24xx
TSSOP24
15
RIb
FSYNCHb
SDI_EESD
12 SDO_EECLK_RTSb SDO/EECLK
9
6
3
TP24
HEADER 5x3
J6
Leaded
+3.3V
INTb/AOUT
GPIO1
NC
RIb
NC
2401
SOIC16
JP6 Right Pin Signals
"SOIC16: 1-2, 5-6, 7-8, 11-12, 14-15"
"TSSOP24: 1-2, 4-5, 7-8, 10-11, 13-14"
"Recommended J6 settings"
CLKOUT_EECSb
FSYNCHb
ESC
SDI_EESD
RIb
INTb
AOUT_INTb
SDO_EECLK_RTSb
DCDb
Si2401
LEFT
RIGHT
DCD or nc
NC or RIb
ESC or NC
nc or GPIO1
nc or INTb/AOUT
"SDO_EECLK_RTSb"
"DCDb"
"GND"
"ESC"
"SDI_EESD"
"RIb"
"INT"
"AOUT_INTb"
ESC
SDI_EESD
RIb
INTb
AOUT_INTb
SDO_EECLK_RTSb
DCDb
RS-232 Si24xx 24 pin
Si24xx 16 pin
LEFT
RIGHT
LEFT
RIGHT
CD
DCD or SDI/EESD
DCD or NC
RI
RI or FSYNCH
NC or RIb
DTR
ESC or RIb
ESC or NC
RTS
RTS or SDO/EECLK
NC or RTSb
DSR INTb or AOUT/INTb
NC or INTb
"J6 Jumper Connectiveity"
1
2
4
5
7
8
10
11
13
14
CLKOUT_EECSb
FSYNCHb
RTSb
RXD
TXD
CTSb
RESETb
1
3
5
7
9
11
13
15
J101
HEADER 8x2
1
3
5
7
9
11
13
15
"CLKOUT_EECSb" 1
3
"FSYNCHb"
5
"RTSb"
7
"RXD"
9
"TXD"
"CTSb"
11
13
"RESETb"
15
"+3.3V"
CLKOUT_EECSb
FSYNCHb
RTSb
RXD
TXD
CTSb
RESETb
VCC_Modem
Connectors for ISOModem module.
Figure 10. Motherboard Modem Interface Schematic
1
19
2
3
4
5
6
7
8
9
NC
NC
RXD
TXD
CTSb
CD
RIb
DTRb
RTSb
DSRb
NC
NC
ESC
NC
NC
ESC
DCD
DCD
24xx
SOIC16
JP6 Left Pin Signals
NOPOP
R39
10K
C73
560pF
2401
SOIC16
+3.3V
1uF
C74
20
VCC
R43
SDI_EESD
TP9
Turret
TP8
Turret
TP7
Turret
TP25
Turret
GND
GND
GND
GND
CLKOUT_EECSb 2
1
1
5
4
3
2
1
3
7
SILABS
Internal
Use Only
NOPOP
J7
5
4
3
2
1
/WP
/HOLD
+3.3V
C98
0.1uF
SCLK
MOSI
MISO
/CS
+3.3V
EE Strap
1
Autobaud Dis. Strap
JP33
JP34
U5
EEPROM 32K
6
5
2
1
2
2
AOUT_INTb
CLKOUT_EECSb
SDI_EESD
FSYNCHb
JP35
EE En.
10K
10K
+3.3V
SDO_EECLK_RTSb
SDI_EESD
R101
200
R48
10K
R52
FSYNCHb
J5A
RJ-11
TELEPHONE
7
8
9
10
11
12
To AOUT circuit on Call
Progress Page
JP2
4X1 Socket
1
2
3
4
5
6
TIP
PSTN LINE
TP6
J5B
BLUE
RJ-11
RING
TP5
BLUE
8
VCC
R59
GND
10
Rev. 0.7
GND
16
4
FB11
Si2493/57/34/15/04
Global ISOmodem-EVB
AOUT_INTb
0.1uF
C24
0.1uF
C25
R33
1K
0.1uF
C26
R34
1K
0.1uF
C27
R35
1K
C37 1uF
10K
1uF
R174
20.0K
Pwr Amp En.
R31
C23
20.0K
JP12
1
2
3
4
C97
LM4819
SHUTDOWN
BYPASS
IN+
IN-
U27
1nF
20.0K
VO2
VO1
C21
1uF
Figure 11. Audio Amplifier Schematic
+4.7V
R173
2
1
6
VDD
GND
7
R172
8
5
R175
0
SPEAKER
LS1
JP14
En. Lcl. Speaker
"Do not gound
speaker+ or
Speaker -
2
1
+4.7V
DIFF SPKR OUT
JP11
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
17
3
2
1
7-12V AC/DC PWR
J9
7-12V AC/DC PWR
2
1
600 Ohm
FB7
600 Ohm
FB6
-
18
25V
0.01uF
C51
R105
R103
Bridge Rectifier
D12
0.01uF
25V
+
J8
C42
1.6
1.6
470uF
C44
+
OUT
GND
C49
10uF
D13
D11
STPS140Z
SOD-123
STPS140Z
+4.7V
C43
1uF
IN
OUT
GND
U3
LT1963A-3.3 V
SOT223
Figure 12. Power Supply Schematic
0.1uF
50V
C48
IN
U10
LM2937ES-5.0
TO263-3N
VCC_USB
R57
0.05
C96
0.1uF
C66
10uF
D50
RED
+3.3V PWR
R161
3
2
RESET
DS1818
RST
GND
VCC
U18
681
1
S1
1.33K
R102
D49
MMBD3004S-7-F
+3.3V
RESETb
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
SG
DTR(I)
TXD(I)
RXD(O)
RD(O)
CTS(O)
RTS(I)
USB
+V
DD+
GND
J11
USB Type B
0.01uF
C60
RS-232, Female,
Front View
5
4
3
MH
MH
10
11
2
1
2
3
4
9
8
7
Keep Very Close
D14
600 Ohm
BLM18AG601SN1
FB9
D15
0.1uF
C63
0.1uF
C61
5
4
7
8
DD+
RST
RI
DCD
DTR
DSR
TXD
RXD
RTS
CTS
SUSPEND
SUSPEND
CP2102
REGIN
VBUS
U12
FB8
9
2
1
28
27
26
25
24
23
11
12
R112
10K
TXD_232
RTS_232
DTR_232
DSR_232
RD_232
CD_232
CTS_232
RXD_232
0.1uF
0.1uF
C62
C55
1uF
+3.3V
C57
C56
14
15
11
9
8
12
10
7
6
5
0.1uF
4
0.1uF
27
Figure 13. RS-232 Interface and USB Interface Schematic
VCC_USB
15V
DN1
6
15V
DN2
DSR(O)
15V
DN3
DB9
15V
DN4
CD(O)
15V
DN5
560pF
15V
DN7
1
R108
0
NOPOP
15V
DN6
600 Ohm
BLM18AG601SN1
C53
C52
15V
DN8
10K
R109
SHDN
MBAUD
R3IN
R2IN
R1IN
T5OUT
T4OUT
T3OUT
T2OUT
T1OUT
V-
V+
26
VCC
GND
2
J10
C54
1uF
GND
3
SH
SH
6
5
6
VDD
GND
Rev. 0.7
EPAD
10K
R111
MAX3237
EN
R3OUT
R2OUT
R1OUT
R1OUTB
T5IN
T4IN
T3IN
T2IN
T1IN
C2-
C2+
C1-
C1+
U11
13
18
20
21
16
17
19
22
23
24
3
1
25
28
C58
0.1uF
0.1uF
C59
10K
R110
+3.3V
RI_U
CD_U
DTR_U
DSR_U
TXD_U
RXD_U
RTS_U
CTS_U
TXD_T
RTS_T
DTR_T
DSR_T
RI_T
CD_T
CTS_T
RXD_T
Si2493/57/34/15/04
Global ISOmodem-EVB
19
Si2493/57/34/15/04
Global ISOmodem-EVB
5. Bill of Materials: Si24xx Motherboard
Table 5. Si24xx Motherboard Bill of Materials
Item
Qty
Ref
Value
1
8
C21, C23,
C37, C43,
C54, C55,
C69, C74
2
17
3
Voltage
Tol
Type
PCB Footprint
Mfr Part Number
Mfr
1 µF
10 V
±10%
X7R
C0603
C0603X7R100-105K
Venkel
C24, C25,
C26, C27,
C53, C56,
C57, C58,
C59, C61,
C62, C63,
C71, C72,
C75, C96,
C98
0.1 µF
10 V
±20%
X7R
C0402
C0402X7R100-104M
Venkel
3
C42, C51,
C60
0.01 µF
25 V
±10%
X7R
C0402
C0402X7R250-103K
Venkel
4
1
C44
470 µF
25 V
±20% Alum_Ele
c
C10.3X10.3MM
EMVE250ADA471MJA0G
United
Chemicon
5
1
C48
0.1 µF
50 V
±10%
X7R
C0603
C0603X7R500-104K
Venkel
6
2
C49, C66
10 µF
16 V
±10%
X5R
C0805
C0805X5R160-106K
Venkel
7
3
C52, C70,
C73
560 pF
16 V
±10%
X7R
C0603
C0603X7R160-561K
Venkel
8
1
C97
1 nF
100 V
±10%
X7R
C0603
C0603X7R101-102K
Venkel
9
8
DN1, DN2,
DN3, DN4,
DN5, DN6,
DN7, DN8
15 V
225 mW
15 V
Zener,
Dual
SOT23-AAK
MMBZ15VDLT1G
On Semi
10
2
D11, D13
STPS140Z
1.0 A
40 V
Schottky
SOD-123
STPS140Z
ST MICRO
11
1
D12
Bridge
Rectifier
0.8 A
100 V
BRIDGE
MiniDIP4
HD01-T
Diodes Inc.
12
3
D14, D15,
D49
MMBD300
4S-7-F
225 mA
300 V
DUAL
SOT23-AKC
MMBD3004S-7-F
Diodes Inc.
13
11
D41, D42,
D43, D44,
D45, D46,
D47, D48,
D50, D52,
D53
RED
25 mA
1.9 V
SMT,
Chip LED
LED-HSMXC170
HSMC-C170
Avago
Technologies
14
1
D54
BAV23A
400 mA
200 V
DUAL
SOT23-KKA
BAV23A
Diodes Inc.
15
5
FB6, FB7,
FB8, FB9,
FB11
600 Ohm
200 mA
SMT
L0603
BLM18AG601SN1
MuRata
16
4
HW1, HW2,
HW3, HW4
spacer
2397
SPC
Technology
17
4
HW5, HW6,
HW7, HW8
screw
NSS-4-4-01
Richco
Plastic Co
20
Rating
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
Table 5. Si24xx Motherboard Bill of Materials (Continued)
Item
Qty
Ref
Value
18
1
JP11
19
2
20
Rating
Voltage
Tol
Type
PCB Footprint
Mfr Part Number
Mfr
HEADER
4X1
Header
CONN-1X4
TSW-104-07-T-S
Samtec
JP12, JP14
JUMPER
Header
CONN-1X2
TSW-102-07-T-S
Samtec
1
JP23
HEADER
1x3
Header
CONN-1X3
TSW-103-07-T-S
Samtec
21
3
JP33, JP34,
JP35
JUMPER
Unshroud
ed
CONN-1X2
68000-402
Berg
22
1
J5
RJ-11
RJ-11
RJ11-DUALMTJG
MTJG-2-64-2-2-1
ADAM TECH
23
1
J6
HEADER
5x3
Header
TSW-105-07-S-T
Samtec
24
1
J8
CONN
TRBLK 2
TERM
BLK
CONN-1X2-TB
1729018
PHOENIX
CONTACT
25
1
J9
Power
Jack
BARREL
CONN-3-PWR
ADC-002-1
Adam Tech
26
1
J10
DB9
D-SUB
CONN-9-DBF
D09S33E4GX00LF
FCI
27
1
J11
USB Type
B
USB
CONN-USB-B
292304-1
Tyco
28
1
J101
HEADER
8x2
Header
CONN2X8
16/80 pins of 9-146252-008
Tyco/AMP
29
1
J102
Socket 1x4
Header
SSW-104-01-T-S
Samtec
30
1
J103
8X2
Shrouded
Header
Shrouded
CONN2X8-4W
5103309-3
Tyco
31
1
LS1
SPEAKER
0.5 W
Max
RE-2308-NL
RE-2308-NL
Regal
32
7
R31, R40,
R41, R42,
R43, R52,
R109, R110,
R111, R112
10 k
1/10 W
±1%
ThickFilm
R0603
CR0603-10W-1002F
Venkel
33
3
R33, R34,
R35
1 k
1/16 W
±1%
ThickFilm
R0603
CR0603-16W-1001F
Venkel
34
1
R48
100 k
1/10 W
±1%
ThickFilm
R0603
CR0603-10W-1003F
Venkel
35
1
R57
0.05 
1/4 W
±5%
ThickFilm
R0805
LCR0805-R050J
Venkel
36
1
R59
1
1/10 W
±1%
ThickFilm
R0603
CR0603-10W-1R00F
Venkel
37
1
R101
200 
1/10 W
±5%
ThickFilm
R0603
CR0603-10W-2000J
Venkel
38
1
R102
1.33 k
1/10 W
±1%
ThickFilm
R0603
CR0603-10W-1331F
Venkel
39
2
R103, R105
1.6 
1/4 W
±5%
ThickFilm
R1206
CR1206-8W-1R6J
Venkel
40
11
R155, R156,
R157, R158,
R159, R160,
R161, R162,
R163, R169,
R170
681 
1/10 W
±1%
ThickFilm
R0603
CR0603-10W-6810F
Venkel
1A
Rev. 0.7
21
Si2493/57/34/15/04
Global ISOmodem-EVB
Table 5. Si24xx Motherboard Bill of Materials (Continued)
Item
Qty
Ref
Value
Rating
41
3
R172, R173,
R174
20.0 k
1/16 W
42
1
R175
0
2A
43
1
S1
SW PUSHBUTTON
50 mA
44
10
TP5, TP6,
TP16, TP17,
TP19, TP20,
TP21, TP22,
TP23, TP24
45
4
46
Voltage
Tol
Type
PCB Footprint
Mfr Part Number
Mfr
±1%
ThickFilm
R0603
CR0603-16W-2002F
Venkel
ThickFilm
R1206
CR1206-4W-000
Venkel
Tactile
SW4N6.5X4.5PB
101-0161-EV
Mountain
Switch
BLUE
Loop
TESTPOINT
151-205-RC
Kobiconn
TP7, TP8,
TP9, TP25
Turret
Turret
TP[12594]
2551-2-00-44-00-00-07-0
Mill-Max
1
TP11
RED
Loop
TESTPOINT
151-207-RC
Kobiconn
47
1
U3
LT1963A3.3 V
LDO
SOT223
LT1963AEST-3.3#PBF
Linear Technologies
48
1
U5
EEPROM
32K
Serial
TSSOP8N6.4P0.
65
25LC320A-I/ST
Microchip
Technology
49
1
U10
5
LDO
TO263-3N
LM2937ES-5.0
National
Semiconductors
50
1
U11
MAX3237
RS232
TSSOP
MAX3237EIPWR
TI
51
1
U12
CP2102
MCU
QFN28N5X5P0.
5
CP2102-GM
SiLabs
52
2
U13, U14
IDT74CBT
LV3257
TSSOP-16
IDT74CBTLV3257
IDT
53
1
U18
DS1818
SOT-23
DS1818-10
Dallas Semiconductor
54
1
U26
74LCX541
TSSOP20N6.4P
0.65
74LCX541MTC
Fairchild
55
1
U27
LM4819
SO8N6.0P1.27
LM4819M
National
Semiconductor
S5B-PH-SM4-TB
JST
12 Vdc
1.5 A
max
0.5 A
max
5.5 V
3.3 V
10%
Buffer
350 mW
Unpopulated Components
56
1
J7
2MM, RT
ANG
1
1
R39
10 k
1/10 W
1
1
R108
0
1A
22
SHROUD CONN1X5-S5BED
PH-SM4-TB
±1%
ThickFilm
R0603
CR0603-10W-1002F
Venkel
ThickFilm
R0603
CR0603-16W-000
Venkel
Rev. 0.7
Figure 14. Daughter Card Primary Side Silkscreen
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
23
Figure 15. Daughter Card Secondary Side Silkscreen
Si2493/57/34/15/04
Global ISOmodem-EVB
24
Rev. 0.7
Figure 16. Daughter Card Primary Side Layout
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
25
Figure 17. Daughter Card Secondary Side Layout
Si2493/57/34/15/04
Global ISOmodem-EVB
26
Rev. 0.7
Figure 18. Motherboard Primary Side Silkscreen
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
27
Figure 19. Motherboard Silkscreen (Secondary Side)
Si2493/57/34/15/04
Global ISOmodem-EVB
28
Rev. 0.7
Figure 20. Motherboard Primary Side Layout
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
29
Figure 21. Motherboard Secondary Side Layout
Si2493/57/34/15/04
Global ISOmodem-EVB
30
Rev. 0.7
Figure 22. Motherboard Ground Plane Layout
Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.7
31
Figure 23. Motherboard Power Plane Layout
Si2493/57/34/15/04
Global ISOmodem-EVB
32
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
6. Complete Design Package on CD
(See Sales Representative for
Details)
Silicon Laboratories can provide a complete design
package of the Si2493/57/34/15/04-EVB including the
following:

OrCad Schematics
 Gerber Files
 BOM
 Documentation
Contact your local sales representative or Silicon
Laboratories
headquarters
sales
for
ordering
information.
Rev. 0.7
33
Si2493/57/34/15/04
Global ISOmodem-EVB
DOCUMENT CHANGE LIST
Revision 0.2 to Revision 0.3

Updated Figure 15, “Daughter Card Secondary Side
Silkscreen,” on page 24.
 Updated Figure 16, “Daughter Card Primary Side
Layout,” on page 25.
 Updated Figure 17, “Daughter Card Secondary Side
Layout,” on page 26.
 Updated “Bill of Materials: Si24xx Daughter Card” .
Revision 0.3 to Revision 0.4

Changed from Rev.1.0 to Rev.1.1 Daughter Card.
Revision 0.4 to Revision 0.5

Changed from Rev.3.1 to Rev.3.2 Motherboard.
Revision 0.5 to Revision 0.6

Changed from Rev.1.1 to Rev.1.2 Daughter Card.
 Added FS (SOIC) Package Option.
Revision 0.6 to Revision 0.7






34
Changed R1.2 to 2.0 daughtercard.
Changed R32 to 5.0 motherboard.
Changed power amplifier chip and speakers.
Removed connector to SSI BUS.
Changed regulator and power on reset circuit.
Changed various jumper locations.
Rev. 0.7
Si2493/57/34/15/04
Global ISOmodem-EVB
NOTES:
Rev. 0.7
35
Si2493/57/34/15/04
Global ISOmodem-EVB
CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Please visit the Silicon Labs Technical Support web page:
https://www.silabs.com/support/pages/contacttechnicalsupport.aspx
and register to submit a technical support request.
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to
support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
Silicon Laboratories, Silicon Labs, and ISOmodem are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
36
Rev. 0.7
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