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 system-
side 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
7.5-13.5 V dc or
peak ac Adaptor
Audio
Out
Audio
Amplifier
Voltage
Regulator
5V
Direct
Access HDR
Daughter Board Boundary
Rectifier
Filter
USB
Connector
3.3 V
USB I/F
Interface
Selection
Jumpers
AOUT
Si2493/57/34/15/04
RESET XTALO
XTALI
Si3018*
Interface
Circuit
RJ-11
Phone
line
UART
DB9
RS-232
Transceivers
Push Button
Reset
Power-On
Reset
*Si3010 for Si2404
Rev. 0.7 4/11
Copyright © 2011 by Silicon Laboratories
Si2493/57/34/15/04-EVB
Si2493/57/34/15/04
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. Si2493/57/34/15/04-
EVB 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.
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 S2493/57/34/15/04-
EVB 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.
1.1. 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:
to PC COM 1 (with a pass-through cable).
RJ-11 to phone line or CO simulator.
9 V ac adaptor (or USB cable).
3. Bring up:
on power to modem.
Autobaud automatically adjusts modem DTE speed and
protocol.
4. Type “AT” followed by a carriage return.
Should
Turn
DB-9
echo “AT” and then an “OK”.
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:
cable to PC
RJ-11 to phone line or CO simulator
3. Download USB driver for your operating system from the
CD supplied with the evaluation board.
4. Install driver.
5. Bring up.
the modem.
Autobaud automatically adjusts modem DTE speed and
protocol.
6. Type “AT” followed by a carriage return.
Should
Reset
USB
echo “AT” and then an “OK”.
2
Rev. 0.7
J6: Jumpers for control
line configuration.
Shown set up for a 24
pin modem on DC.
Insert JP33 & JP34
jumpers to enable
EEPROM
EEPROM
(U5)
Insert jumper in
JP34 to run at a
fixed 19.2 kBaud
rate.
Remove JP12
Jumper to shut
down audio
power amp U27
Call progress
Speaker, and its
jumper JP14.
Audio Power
amp (U27)
USB,
virtual com
port link to
Host (J11)
RS232 vs USB
select jumper,
JP23, with
RS232 select
shown.
(Remove to
disable both
modes).
AC/DC Pwr
Inputs: J8
or J9.
Speaker
Output,
JP11
RJ11
Tel. Line
connectors.
Rev. 0.7
RS232 com
port link to
Host
LEDs and test
points showing
status of all
control lines as
well as TX/RX
System Connector.
Allows all modem
signals to be
probed or routed
elsewhere.
Reset
Pushbutton
Tests points (+3.3V
and Isense) that allow
modem current o tbe
measured via the 1.0
Ohm shunt: R59.
Modem daughter cards
mate with J101 & JP2.
(Daughter card versions
prior to rev. 2.0 will not fit
this motherboard.)
Tip and ring
signals available
at these test
points.
Si2493/57/34/15/04
Figure 1. Default Motherboard Setup
3
Si2493/57/34/15/04
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.
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.
1.3.1.3. EEPROM Control
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.
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.
1.3.1.5. Control Line Configuration
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
1
4
7
10
13
3
6
9
12
15
Figure 2. Default J6 Setup for 24-Pin Modem
Chips
J6
1
4
7
10
13
3
6
9
12
15
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.
Table 1. Routing of Control Signals with Jumper Position on J6
RS232
Signal
DCD
RI
DTR
RTS
DSR
Si24xx 24-Pin
Left
DCD
RI
ESC
RTS
INT
Right
SDI/EESD
FSYNCH
RI
SDO/
EECLK
AOUT/INT
Si24xx 16-Pin
Left
DCD
NC
ESC
NC
NC
Right
NC
RI
NC
RTS
INT
Left
DCD
NC
ESC
NC
NC
Si2401
Right
NC
RI
NC
GPIO1
AOUT/INT
4
Rev. 0.7
Si2493/57/34/15/04
1.3.2. Daughter Card Configuration
The daughter card comes configured with either a 24-
pin 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
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