Si2435-17FT18 Global Fax ISOModem EVB User's Guide

Si2435/17FT18
Global Fax ISOmodem-EVB
Evaluation Board for the Si2435/17 with a
UART Interface
Description
An onboard 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 (J3) or a standard
2 mm power jack (J4). 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
piezoelectric speaker mounted directly on the board.
Please note that the PCM interface, parallel interface,
and EEPROM are available on the FT only. The Si2435/
17 devices require a software driver in order to
implement fax send/receive functionality. The driver
must be compliant with the Si2435/17 and with the
applicable ITU-T standards (e.g. T.30, T.31, T.4, and
T.6). Contact Silicon Laboratories for details.
The global Si2435/17-EVB evaluation board provides
the system designer an easy way of evaluating the
Si2435/17 Fax ISOmodem®. The Si2435/17-EVB
consists of a motherboard with a power supply, an RS232 and USB interface, other ease-of-use features, and
a complete removable modem module on a daughter
card. (A functional block diagram of the Si2435/17-EVB
is shown below.) The Si2435/17 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 system-side
device, the Si2435/17 ISOmodem eliminates the need
for a separate DSP data pump, modem controller,
memories, codec, isolation transformer, relays, optoisolators, and a 2- to 4-wire hybrid. The Si2435/17 is
ideal for embedded fax modem applications due to its
small board area, controller-based architecture, low
power consumption, and global compliance. The
Si2435/17-EVB provides an RJ-11 jack (for interfacing
the Si2435/17-EVB to the phone line), and USB and
RS232 serial ports for interfacing to a PC or host. This
allows the ISOmodem to operate as a Class 1 modem
for straightforward evaluation of the Si2435/17. To
evaluate the Si2435/17 ISOmodem in an embedded
system, the daughter card can be used independently
of or with the motherboard. A direct access header
(JP3) is available on the motherboard to bypass the RS232 transceivers and connect the Si2435/17 Fax
ISOmodem directly to a target system.
Features
The Si2435/17-EVB includes the following:
 Dual RJ-11 connection to phone line
 RS-232 and USB interface to PC
 Piezoelectric speaker for call monitoring
 Direct access to Si2435/17 for embedded
application evaluation
 Easy power connection to common 7.5 V–13.5 V
power supplies or USB port
 9 V ac adaptor
 Support for daisy chain operation with Si3000 voice
codec
 Simple installation and operation
 Requires a Class A (ITU-T T.31) fax driver
Functional Block Diagram
PCM Data/
Control
9 V dc at 300 mA ac
Adaptor
7.5–13.5 V dc or
peak ac
Rectifier
Filter
Voltage
Regulator
Audio
Amplifier
Direct
Access HDR
3.3 V
Daughter Board Boundary
5V
USB
Connector
UART
PCM
Interboard
Connector
Audio
Out
USB I/F
DB9
RS-232
Transceivers
AOUT
Interface
Selection
Jumpers
Si3018*
Si2435/17
RESET
XTALO
Interface
Circuit
RJ-11
Phone
line
XTALI
Push Button
Reset
Power-On
Reset
Rev. 1.0 12/06
Copyright © 2016 by Silicon Laboratories
Si2435/17FT18-EVB
Si2435/17FT18-EVB
1. Si2435/17-EVB Setup and
Evaluation
1.2. Si2435/17-EVB Quick Start (RS-232
Interface)
1. Set jumpers according to Figure 1 or Figure 2.
This section explains how to set up the Si2435/17-EVB
for evaluation as an RS-232 or USB interface modem.
Jumper settings and power connections are given. The
initial modem setup after power is applied as well as a
basic tutorial on modem operation are provided. Si2435/
17-EVB configurations for evaluating additional features
are discussed separately. See the Si2493/57/34/15 data
sheet and “AN244: Si2435/Si2417 Fax Modem
Designer’s Guide” for complete details.
2. Connect:
DB-9
to PC COM port (with a pass-through cable).
to phone line or test box.
9 V ac adaptor (or USB cable).
3. Open the terminal emulator program, and apply power to
the EVB.
RJ-11
4. Type “AT” followed by a carriage return. (Autobaud
automatically adjusts modem DTE speed and protocol.)
The modem should echo “AT” and then send the “OK”
response code.
1.1. Jumper Settings
Check all jumper settings on the Si2435/17-EVB before
applying power. The standard factory jumper settings
are shown in Figure 1. These settings configure the
Si2435/17-EVB for RS-232 serial operation with
autobaud. Any terminal emulator program configured to
communicate through a PC COM port can be used to
communicate with the Si2435/17-EVB.
Note: Although the user can exercise many of the Si2435/17
commands (including voice features) using a terminal
emulator program, a fax driver is required to implement
fax send/receive functionality.
The standard factory jumper settings for USB operation
are shown in Figure 2. The only difference between RS232 and USB jumper settings is that JP5 must be
installed to enable USB.
1.3. Si2435/17-EVB Quick Start (USB Interface)
1. Set jumpers according to Figure 2 or Figure 3.
2. Connect:
USB
cable to PC
to phone line or test box
3. Download USB driver for your operating system from the
CD supplied with the evaluation board.
RJ-11
4. Install driver.
5. Open the terminal emulator program.
6. Manually reset the EVB.
7. Type “AT” followed by a carriage return. (Autobaud
automatically adjusts modem DTE speed and protocol.)
The modem should echo “AT” and then send the “OK”
response code.
Figure 1. Standard Factory Jumper Settings—RS-232 Interface (Outlined in Gray) (FT Option)
2
Rev. 1.0
Si2435/17FT18-EVB
Figure 2. Standard Factory Jumper Settings—USB Interface (Outlined in Gray)
Figure 3. Standard Factory Jumper Settings—USB Interface (Outlined in Gray) (FS Option)
Rev. 1.0
3
Si2435/17FT18-EVB
1.4. Power Requirements
2.1. Motherboard
The Si2435/17-EVB has an onboard diode bridge, filter
capacitor, and voltage regulator (U1). 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 Si2435/17-EVB through the
screw terminals (J3), the 2 mm power jack (J4), or the
USB cable (even if the modem is configured for RS-232
operation). The onboard full-wave rectifier and filter
ensure the correct polarity is applied to the Si2435/17EVB. Daughter card power is supplied through voltage
regulator U2 by connecting JP7, pins 1 and 2. Daughter
card current can be measured by connecting an
ammeter between JP7, pins 1 and 2. Failure to connect
pins 1 and 2 of JP7 through either a jumper or a lowimpedance ammeter may result in damage to the
Si2435/17-EVB.
The motherboard provides a convenient interface to the
Si2435/17 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 Si2435/17-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 Si2435/17, bypassing the RS-232
transceivers or USB interface. This is particularly useful
for directly connecting the Si2435/17 to embedded
systems.
1.5. EVB Part Numbers
The Fax ISOmodem® evaluation boards are offered in
multiple speeds. The first four numbers indicate the
system-side device. The options are Si2435 for speeds
up to V.34 or Si2417 for speeds up to V.17. The next
two letters indicate the system-side package FT–Leadfree, 24-pin TSSOP). The final two numbers indicate the
line-side device. See Figure 4.
Si2435FT18-EVB
LS Part Number (Si3018)
SS Package
SS Part Number (Si2435 or Si2417)
Figure 4. EVB Part Number Example
2. Si2435/17-EVB Functional
Description
The Si2435/17-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 Si2435/17 Fax ISOmodem.
4
The Si24xxURT-EVB motherboard connects to the
daughter card through two connectors, JP1 and JP2.
JP1 is an 8x2 socket providing connection to all Si2435/
17 digital signals and regulated 3.3 V power for the
Si2435/17. The Si2435/17 digital signals appearing at
JP1 (daughter card interface) are LVCMOS and TTL
compatible. The Si2435/17 daughter card must be
powered by 3.3 V. The motherboard is factory
configured for 3.3 V with JP7. JP2 is a 4x1 socket
providing connection between the daughter card and
the RJ-11 phone jack.
2.1.1. Voltage Regulator/Power Supply
The input voltage to either J3 or J4 must be between 7.5
and 13.5 V dc or 7.5 and 13.5 VPEAK ac. The
motherboard includes a diode bridge (D1–D4) 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. C6 serves as a
filter cap for an ac input. The voltage regulator, U1,
provides 5 V for the motherboard and the input for
voltage regulator U2, 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 between pins 1 and 2 of JP7. The connection
between JP7 pins 1 and 2 must be made at all times
when power is applied to the evaluation board either
through a jumper block or a low-impedance meter to
avoid damage to the daughter card. Power is supplied
to U2 through D5 from the USB.
2.1.2. Reset Circuitry
The Si2435/17 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 Si2435/17
modem chipset applications require that RESET be
controlled by the host processor. Certain Si2435/17
operation modes, including powerdown, require a
hardware reset to recover.
Rev. 1.0
Si2435/17FT18-EVB
The Si2435/17-EVB contains two reset options, an
automatic power-on reset device, U3 (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. See
Figure 10 on page 13 and Figure 12 on page 15 for the
reset circuit schematic.
Table 1. Interface Selection Jumpers
Jumper
2.1.3. 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.
Function
JP1
Daughter Card Digital Connector.
JP2
Daughter Card Phone Line Connector.
JP3
Direct Access Header.
JP4
PCM Interface.
JP5
USB Enable (RS-232 Disable).
JP6
Options.
JP7
3.3 V Power for Daughter Card.
JP8
Disable both RS-232 and USB.
JP9
Autobaud disable.
JP10
N/A
JP11
Enable 27 MHz Clock option.
2.1.4. Manual Reset
JP12
Not used.
The manual reset switch (S1) performs a power-on
reset. This resets the Si2435/17 to factory defaults
without turning off power. If S1 is used in conjunction
with U3, pressing S1 activates the reset monitor in the
DS1818 and produces a 220 ms active low reset pulse.
JP13
Onboard speaker enable.
2.1.5. Interface Selection
The serial interface of the Si2435/17-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.
Jumper settings determine how the Si2435/17-EVB is
connected to the DTE. Table 1 lists the interface
controlled by each motherboard jumper. See Figure 11
on page 14 and Figure 21 on page 24.
2.1.6. RS-232 Interface
This operation mode uses the standard factory jumper
settings illustrated in Figure 1 on page 2. The Maxim
MAX3237 transceiver interfaces directly with the TTL
levels available at the serial interface of the Si2435/17
and, using internal charge pumps, makes these signals
compatible with the RS-232 standard. The RS-232
transceiver on the Si2435/17-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 Si2435/17-EVB
serial interface (DB9 connector) are listed in Table 2.
2.1.7. USB Interface
The USB cable connects to J5 on the motherboard and
provides both data and power. Installing a jumper on
JP5 enables the USB interface and disables the RS-232
interface. The USB interface is provided by U5. A USB
driver for this chip is available for most PC and MAC
operating systems on the CD.
2.1.8. Direct Access Interface
The motherboard supplies power through J3, J4, or
USB, power-on reset, and an RJ-11 jack for the modem.
The direct access interface (JP3) is used to connect the
motherboard to an embedded system. JP3 provides
access to all Si2435/17 signals available on the
daughter card. It is necessary to install a jumper on JP8
to disable both the RS-232 and USB interface and
prevent signal contention. Leave the jumper between
JP7 pins 1 and 2. Figures 5 and 7 illustrate the jumper
settings required for the direct access mode using the
motherboard.
Rev. 1.0
5
Si2435/17FT18-EVB
2.1.9. PCM Interface
The Si2435/17 PCM interface is available on JP4.
Table 3 lists the pin connections for JP4 designed to
connect directly to the Si3000SSI-EVB JP6.
Table 2. DB9 Pin Connections
J1 Name
J1 Symbol
J1 Pin
Si2435/17 Pin
Si2435/17 Name
See note
DCD/EESD
*
Carrier Detect
CD
1
Received Data
RXD
2
9
RXD
Transmit Data
TXD
3
10
TXD
Data Terminal Ready
DTR
4*
See note
ESC/RI
Signal Ground
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
RD
9*
17
RI
Ring Indicator
*Note: JP6 jumper option.
Table 3. JP 4 PCM Interface Pin Connections
6
JP 4 Pin
Board Signal
Si24xx Pin
Si24xx Signal
1
CLKOUT_H
3
CLKOUT
2
TXCLK_H
4
FSYNC
3
GND
6, 20
GND
4
GND
6, 20
GND
5
RXCLK_H
24
SDO
6
EESD_H
18
SDI
7
RESETb
12
RESET*
8
3.3 V
5, 21
VD3.3
9
GND
6, 20
GND
10
VCC (+5 V)
Rev. 1.0
Si2435/17FT18-EVB
Figure 5. Jumper Settings for Direct Access Interface
The block diagram in Figure 6 shows how the two evaluation boards are connected to demonstrate voice mode
operation.
Si3000SSI-EVB Motherboard
Si3000 Daughterboard
JP5
1
2
J
3
Speaker Mic
SW2
Line
In
Leave J3 unconnected.
Power is provided through
JP 6 connector.
J6 of Daughterboard
Line J
Out 6
12 V
GND
External
+12 V
Supply
JP4
JP4
RJ11
SW3
2
1
JP6
Note M1 and M0
jumper settings.
Direct Connection
Si24xxFT18-EVB
JP4
J4
RS232
Power
Adapter
Si24xx-DC
RJ11
COM 1
Windows PC®
Figure 6. Connection Block Diagram for Si3000SSI-EVB and Si24XXURT-EVB
Rev. 1.0
7
Si2435/17FT18-EVB
2.1.10. Voice Mode
See “AN244: Si2435/Si2417 Fax Modem Designer’s
Guide” for details.
Figure 7 shows the actual circuit connection between
the Si2435/17 and the Si3000.
VDD
C52
5
21
C50
U3
VD3.3
VD3.3
NOTE: D6 (PIN 4) MUST NOT HAVE PULLDOWN RESISTOR
24
23
22
15
4
SDO/D5
DCD/D4
ESC/D3
AOUT/INT
FSYNC/D6
INTb
RIb
16
17
18
INT/D0
RI/D1
SDI/D2
CLKOUT/A0
C1A
14
C1A
RTSb
RXD
TXD
CTSb
8
9
10
11
RTS/D7
RXD/RD
TXD/WR
CTS/CS
C2A
13
C2A
RESETb
12
RESET
1
XTALI
XTALO
2
XTALO
6
20
7
19
3
CLKIN/XTALI
GND
GND
VDA
VDB
DCDb
ESC
AOUT
Si2435/17
VDD
C51
R61
C53
C66
0
C68
0.1 uF
0.1 uF
SPKR_R
1
SPKR_R
MIC_BIAS
2
MIC_BIAS
HDST
3
HDST
4
SDI
VA
13
5
SDO
VD
12
6
FSYNC
LINEI
11
LINEI
7
MCLK
MIC_IN
10
MIC_IN
8
SCLK
RESET
9
VDD
R62
47 k
R63
47 k
SPKR_L
16
SPKR_L
LINEO
15
LINEO
GND
14
Si3000
Figure 7. Circuit Connection between the Si2435/17 and the Si3000
2.1.11. Audio Output
Audio output is provided from the Si2435/17 on the
AOUT pin. 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
can be connected to an amplifier, such as the LM386
(the default stuffing option on the Si2435/17FT18-EVB),
for 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.
2.1.12. Amplifier (LM386)
The audio amplifier circuit consists of U10 (LM386),
C20, R3, R4, C21, C22, C23, R5, C24, and an optional
loudspeaker, LS1. The LM386 has an internally-set
voltage gain of 20. R3 and R4 provide a voltage divider
to reduce the AOUT signal in order to prevent
8
overdriving the LM386. C20 provides dc blocking for the
input signal and forms a high-pass filter with R3+R4
while R4 and C21 form a low-pass filter. These four
components limit the bandwidth of the AOUT signal.
C22 provides high-frequency power supply bypassing
for the LM386 and should be connected to a hard
ground and located very close to the amplifier’s power
supply and ground pins. C23 and R5 form a
compensation circuit to prevent oscillation of the highcurrent PNP transistor in the LM386 output stage on
negative signal peaks. These oscillations can occur
between 2 and 5 MHz and can pose a radiation
compliance problem if C23 and R5 are omitted. C24
provides dc blocking for the output of the LM386, which
is biased at approximately 2.5 V (VCC/2) and forms a
high-pass filter with the impedance of the loudspeaker
(LS1). The output from the LM386 amplifier circuit is
available on the RCA jack, J2 (not installed). Install
jumper JP13 to enable the onboard speaker, LS1.
Rev. 1.0
Si2435/17FT18-EVB
3. Design
2.2. Modem Module Operation
The Si2435/17FT18-EVB daughter card is a complete
modem solution perfectly suited for use in an embedded
system.
The following sections contain the schematics, bill of
materials, and layout for the Si2435/17 including the
daughter card and motherboard.
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 Si2435/17 Fax ISOmodem® daughter card must be
properly reset at powerup. The reset pin (pin 8) of the
Si2435/17 (JP1, 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 Si2435/17FT18-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 Si2435/17-EVB provides
isolation to 3 kV. Contact Silicon Laboratories for
information about designing to higher levels of isolation.
Rev. 1.0
9
C54
+
VDD
1.3 k
R18
C55
FB5
C56
CLKOUT
TXCLK
RTSb
RXD
TXD
CTSb
RESETb
2
4
6
8
10
12
14
16
HEADER 8X2
1
3
5
7
9
11
13
15
JP1
ESC
EESD
RIb
INTb
AOUT
RXCLK
DCDb
Rev. 1.0
VDA
C2A
C2A 13
C53
C1A
XTALO
XTALO 2
C1A 14
XTALI
CLKIN/XTALI 1
U7
Figure 8. Si2435/17 Schematic
Si2435/17
12 RESET
RESETb
RTS/D7
RXD/RD
TXD/WR
CTS/CS
8
9
10
11
3 CLKOUT/A0
RTSb
RXD
TXD
CTSb
CLKOUT
SDO/D5
DCD/D4
ESC/D3
AOUT/INT
FSYNC/D6
16 INT/D0
17 RI/D1
18 SDI/D2
24
23
22
15
4
INTb
RIb
EESD
RXCLK
DCDb
ESC
AOUT
TXCLK
VD3.3
VD3.3
GND
GND
VDA
VDB
6
20
7
19
10
5
21
VDD
INTb
EESD
AOUT
RIb
JP2
DCDb
R20
R21
R22
R23
R19
0
C2A
C1A
These components
for internal
Silabs use only.
RING
TIP
Si2435/17FT18-EVB
C2A
C1A
R13
R12
R9
Bias
C2
C1
C5
C6
10
7
4
6
5
VREG2
VREG
IB
C2B
C1B
U2
IGND
15
Rev. 1.0
RX
8
9
1
12
13
16
14
2
3
Si3010/18
RNG1
RNG2
QE
QE2
QB
DCT2
DCT3
DCT
SC
C4
R1
+
11
R2
R11
Q4
R4
R8
R7
R5
Q1
Q3
R30, R31, R32, R33, C30 and C31
are an optional CID population
Z1
R3
Q2
Hookswitch
C10
Figure 9. Si3018 DAA Schematic
Ring Detect/CID
Q5
DC Term
R10
C7
R6
No Ground Plane In DAA Section
+
D1
C3
-
FB1
FB2
C9
C8
R15
R16
TIP
RV1
R ING
Si2435/17FT18-EVB
11
Si2435/17FT18-EVB
4. Bill of Materials: Si24xx Daughter Card
Item
1
2
3
Quantity
2
C2,C1
1
C3
1
C4
Reference
Rating
Y2
250 V
50 V
Tolerance
±20%
±20%
±20%
Foot Print
1808
0805
Size A
16 V
50 V
Y3
16 V
16 V
16 V
10 V
400 V
±20%
±20%
±10%
±20%
±5%
±20%
±10%
0603
0603
1808
0603
0603
0603
Case A
Mini-DIP
0603
2x8 Surface Mount
Header, .1 space
CONN1X4-100SMT
SOT-23
SOT-23
SOT-23
SOD 6
1210
0402
1210
1210
0402
0805
0402
1206
1210
0603
24pin TSSOP
16pin SOIC
ATS-SM
4
5
6
7
8
9
10
11
12
13
3
1
2
1
2
1
1
1
2
1
C5,C6,C50
C7
C9,C8
C10
C41,C40
C51
C54
D1
FB1,FB2,FB5
JP1
0.1 uF
2.7 nF
680 pF
0.01 uF
33 pF
0.22 uF
1.0 uF
HD04
Ferrite Bead
HEADER 8X2
14
1
JP2
4X1 Header_0
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
2
1
2
1
1
1
1
1
2
2
1
1
1
4
1
1
1
Q3,Q1
Q2
Q4,Q5
RV1
R1
R2
R3
R4
R5,R6
R8,R7
R9
R10
R11
R12,R13,R15,R16
U3
U2
Y1
32
1
Z1
Non-installed Components
33
2
C31,C30
34
2
C55,C56
35
1
R18
36
5
R19,R20,R21,R22,R23
37
2
R32,R30
38
2
R33,R31
39
1
C52
40
1
C53
12
Value
33 pF
10 nF
1.0 uF
NPN
PNP
NPN
SiDactor
1.07 K
150
3.65 K
2.49 K
100 K
20 M
1M
536
73.2
0
Si24xx
Si3018
4.9152Mhz
300 V
300 V
80 V
275 V
1/2 W
1/16 W
1/2 W
1/2 W
1/16 W
1/8 W
1/16 W
1/4 W
1/2 W
1/16 W
100 A
±1%
±5%
±1%
±1%
±5%
±5%
±1%
±1%
±1%
±1%
50 ppm
43 V
20pF load,
150 ESR
1/2 W
120pF
0.1 uF
1.3 k
0
15M
5.1M
0.1 uF
0.22 uF
250 V
10 V
1/16 W
1/16W
1/8 W
1/8 W
16 V
16 V
±10%
±20%
±5%
±5%
±5%
±5%
±20%
±20%
Dielectric
X7R
X7R
Al
Electrolytic
X7R
X7R
X7R
X7R
NPO
X7R
Tant
SOD-123
Rev. 1.0
0805
C0603
RC0603
RC0603
0805
0805
0603
0603
X7R
X7R
X7R
X7R
Manufacturer Number
GA342D1XGF330JY02L
C0805X7R251-103MNE
NACE1R0M50V
Manufacturer
Murata
Venkel
NIC Components
C0603X7R160-104MNE
C0603X7R500-272MNE
GA342QR7GD681KW01L
C0603X7R160-103MNE
C0603NPO160-330JNE
C0603X7R160-104MNE
TA010TCM105-KAL
HD04-T
BLM18AG601S
TSM-108-01-T-DV
Venkel
Venkel
Murata
Venkel
Venkel
Venkel
Venkel
Diodes, Inc.
MuRata
Samtec
68000-403
Berg
MMBTA42LT1
MMBTA92LT1
MMBTA06LT1
P3100SB
CR1210-2W-1071FT
CR0402-16W-150JT
CR1210-2W-3651FT
CR1210-2W-2491FT
CR0402-16W-104JT
CR0805-8W-206JT
CR0402-16W-1004FT
CR1206-4W-5360FT
CR1210-2W-73R2FT
CR0603-16W-000F
Si3018-F-FS
559-FOXSD049-20
OnSemi
OnSemi
OnSemi
Teccor
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Silicon Laboratories
Silicon Laboratories
CTS Reeves
MMSZ43T1
OnSemi
C0805X7R251-121KNE
C0603C124K
CR0603-16W-132JT
CR0603-16W-000J
CR0805-8W-156JT
CR0805-8W-515JT
C0603X7R160-104MNE
C0603X7R160-104MNE
Venkel
Kemet
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Rev. 1.0
1
2
2.1 mm Power jack
J4
1
2
1
2
3
4
Power Connector
"7-12V AC or DC"
J3
M2
M1
SG
DTR(i)
TXD(i)
RXD(o)
CD(o)
J5
USB Type B
5
9
8
7
6
B3
DB9-RS232_1
J1
RD(o)
CTS(o)
RTS(i)
DSR(o)
RS-232
USB
11
10
5
4
3
2
1
V2
V1
USB_+5
SW PUSHBUTTON
S1
"RESET"
RESETb
PowerBlock
R1
NI
0
B2
JP7
VCC
"Mux off"
OE
"USB"
VD
EESD_H
"AUTOBAUD"
JP9
R10
10k
1
3
5
7
9
11
13
15
JP3
"EEPROM"
R11
10k
TXCLK_H
for JP6
Si2400 only
nc or GPIO2
GPIO3 or nc
GPIO1 or GPIO3
CLKOUT or nc
GPIO4 or AOUT
Si2456/57
DCD or EEIO
RI or TXCLK
ESC or X
RTS or RXCLK
INT or AOUT
14
13
11
10
8
7
5
4
DC D_H
R12
10k
"27MHz CLK"
JP11
JP6
15
12
9
6
3
Si2401
GPIO2 or nc
nc or GPIO5
GPIO3 or nc
nc or GPIO1
nc or GPIO4
Place White Dot
Silkscreen Near
Pin 1
AOUT_H
"ESC"
"EESD"
"RIb"
"INT"
"AOUT"
2
DC D_H
"RXCLK"
"DCDb"
1
2
4
6
8
10
HEADER 5X2
"PCM"
R28
10k
"Si2401 27MHz CLK"
JP12
AOUT_H
Si2401 Reset Options
"JP6: recommended settings"
"Si2400: 2-3, 4-5, 8-9, 11-12, 13-14"
"Si24xx: 1-2, 4-5, 7-8, 10-11, 13-14"
"Si2401: 1-2, 5-6, 7-8, 11-12, 14-15"
"Si24xx alt: 1-2, 5-6, 7-8, 11-12, 14-15"
Table on silkscreen
RS-232 Function
Info
CD
Info
RI
Ctrl
DTR
Ctrl
RTS
Info
DSR
JP10
2
4
6
8
10
12
14
16
R2
HEADER 8X2
Place White Dot
Silkscreen Near
Pin 1
"CLKOUT"
TXCLK_H "TXCLK"
"RTSb"
"RXD"
"TXD"
"CTSb"
"RESETb"
RESETb
Si24xx Reset Options
JP5
DSR_M
RTS_M
DTR_M
RI_M
CD_M
RXD_M
TXD_M
CTS_M
UART Mux
RESETb
1
3
5
7
9
R6
R7
B5
AOUT
+3.3V
Speaker
B6
ESC_H
EESD_H
RI_H
INT_H
AOUT_H
RXCLK_H
DCD_H
CLKOUT_H
TXCLK_H
RTS_H
RXD_H
TXD_H
CTS_H
RESET_H
0
0
+3.3V VCC
SPEAKER
C32
0
SDO
JP13
J2
VCC
"EEPROM"
HOLD
WP
CS
SCLK
SDI
RCA JACK
NI
8
7
3
1
6
5
U9
R27
RING
TIP
Daughter Card Socket
EESD_H
EECS_H
EECLK_H
EESD_H
RESET
Right angle connector on board edge
JP4
Figure 10. Motherboard Top-level Schematic
JP7 for measuring
current to modem (i.e.
VD goes to modem only)
R8
1.3k
JP8
RI_U
RI_U
DTR_U
DTR_U
CD_U
DSR_U
CD_U
RTS_U
DSR_U
CTS_U
CTS_U
RTS_R
TXD_U
TXD_U
RI_T
RI_T
RXD_U
CD_T
DTR_T
DSR_T
RTS_T
CTS_T
TXD_T
RXD_T
RXD_U
VD
+3.3V
USB
USBUSB+
B4
CD_T
DTR_T
DSR_T
RTS_T
CTS_T
TXD_T
RXD_T
RS-232
RD_R
CTS_R
RTS_R
DSR_R
B1
S
DTR_R
TXD_R
RXD_R
CD_R
2
R9
0
"TIP"
TP7 "RING"
TP8
1
2
3
4
5
6
7
8
9
10
11
12
Speaker
LS1
RJ11
Si2435/17FT18-EVB
13
14
C1
1.0 uF
VD
+
FB2
C2
C3
470 pF 1.0 uF
CLKOUT_H
TXCLK_H
RTS_H
RXD_H
TXD_H
CTS_H
RESET_H
EECS_H
R26
1.3k
2
4
6
8
10
12
14
16
C4
470 pF
SOCKET 8X2
1
3
5
7
9
11
13
15
JP1
Place White Dot
Silkscreen Near Pin 1
Rev. 1.0
Si2401
NC
GPIO1
GPIO5
GPIO2
NC
GND
RXD
GPIO3
TXD
NC
CTS
NC
RESET
NC
VD
GPIO4
JP2
RING
TIP
TIP and RING minimum 20 mils wide and as far as possible from ground.
Connectors for ISOModem module.
ESC_H
EESD_H
RI_H
INT_H
AOUT_H
RXCLK_H
DCD_H
EECLK_H
Figure 11. Daughter Card Interface Schematic
Table NOT on silkscreen
JP1/3
Si24xx
Si2400
1
NC
CLKOUT/A0
2
NC
SDO/D5
FSYNC/D6
3
NC
NC
DCD/D4
4
RTS/D7
5
CLKOUT
GND
GND
6
RXD/RD
RXD
7
ESC/D3
GPIO1
8
TXD/WR
TXD
9
SDI/D2
GPIO2
10
CTS/CS
CTS
11
RI/D1
GPIO3
12
RESET
RESET
13
INT/D0
GPIO4
14
VD
15
VD
AOUT/INT
16
AOUT
Net names correspond to
Si24xx. See table for
Si2400 equivalents
+
R17
10k
VD
Si2435/17FT18-EVB
V2
V1
D2
D4
D1
D3
+
C6
470 uF
C7
0.1 uF
1
IN
U1
Rev. 1.0
TP6
TP5
TP4
TP3
Standoffs in each corner of board.
1.6
R13
USB_+5
1
2
7805
"GND"
"GND"
"GND"
C8
10 uF
D5
C9
0.1 uF
BAT54C
VCC
4
3
2
1
U2
FB/NC
OUT(2)
OUT(1)
TPS77601DR
IN(2)
IN(1)
EN
GND RESET/PG
TP16
"+5V"
5
6
7
8
R16
110k
R14
196k
C10
10 uF
TP17
"+3.3V"
Figure 12. Power Supply Schematic
TP18
TP2
TP1
3
FB1
OUT
10 nF
C5
GND
2
USB_VCC
+3.3V
VD
C11
470 pF
R15
3
2
RST
0
DS1818
GND
VCC
U3
OPTIONAL
1
RESET
Si2435/17FT18-EVB
15
Rev. 1.0
TXD_R
RTS_R
DTR_R
DSR_R
RD_R
CD_R
CTS_R
RXD_R
D6
MMBZ15VDC
D7
MMBZ15VDC
D8
MMBZ15VDC
D9
MMBZ15VDC
MMBZ15VDC
D10
MMBZ15VDC
D12
+
MMBZ15VDC
D13
C13
470 pF
C14
0.1 uF
R31
10k
NI
R30
10k
VCC
1.0 uF
+ C15
R33
10k
R32
10k
NI
Figure 13. RS-232 Interface Schematic
MMBZ15VDC
D11
C12
1.0 uF
FB3
C17
C16
14
15
11
9
8
12
10
7
6
5
4
27
SHDN
MBAUD
R3IN
R2IN
R1IN
T5OUT
T4OUT
T3OUT
T2OUT
T1OUT
V-
V+
26
VCC
GND
16
2
VCC
MAX3237
EN
R3OUT
R2OUT
R1OUT
R1OUTB
T5IN
T4IN
T3IN
T2IN
T1IN
C2-
C2+
C1-
C1+
U4
13
18
20
21
16
17
19
22
23
24
3
1
25
28
R29
10k
TP10
C19
C18
TP11
TXD_T
RTS_T
DTR_T
DSR_T
RI_T
CD_T
CTS_T
RXD_T
Si2435/17FT18-EVB
Si2435/17FT18-EVB
VCC
R3
3
7
2
AOUT
47 k
C21
R4
3k
820 pF
-
4
8
0.1 uF
+
C24
5
+
C20
6
1
C22
0.1 uF
1
U10
LM386M-1
C23
2
SPEAKER
100 uF
0.1 uF
R5
10
Figure 14. Audio Amplifier Schematic
"CTS_U"
TP12
"RXD_U"
TP13
U7
TXD_U
RXD_U
RTS_U
CTS_U
2
5
11
14
1B1
2B1
3B1
4B1
1A
2A
3A
4A
4
7
9
12
TXD_T
RXD_T
RTS_T
CTS_T
3
6
10
13
1B2
2B2
3B2
4B2
OE
S
15
1
TP15
"CTS_T"
TP14
"RXD_T"
TXD_M
RXD_M
RTS_M
CTS_M
VCC
R18
10k
74CBT3257/SO
S
O\E\
U8
DTR_U
DSR_U
CD_U
RI_U
2
5
11
14
1B1
2B1
3B1
4B1
1A
2A
3A
4A
4
7
9
12
DTR_T
DSR_T
CD_T
RI_T
3
6
10
13
1B2
2B2
3B2
4B2
OE
S
15
1
DTR_M
DSR_M
CD_M
RI_M
R19
10k
74CBT3257/SO
Figure 15. UART Mux Schematic
Rev. 1.0
17
Si2435/17FT18-EVB
USB_VCC
U5
C29
1.0 uF
+
C31
8
VBUS
7
REGIN
6
R20
4.7 k
RST
9
SUSPEND
12
SUSPEND
11
RI
DCD
DTR
DSR
TXD
RXD
RTS
CTS
2
1
28
27
26
25
24
23
VDD
TP19
RI_U
3
GND
U11
1
5
5
4
USB-
2
3
DD+
CD_U
DTR_U
DSR_U
TXD_U
RXD_U
4
CP2101/02
RTS_R
GMS05F
USB+
CTS_U
Figure 16. USB Interface Schematic
18
Rev. 1.0
Si2435/17FT18-EVB
5. Bill of Materials: Si24xx Motherboard
Reference
C1,C3,C12,C15,C29
C2,C4,C11,C13
C5
C6
C7,C9
C10,C8
C14,C16,C17,C18,C19,C2
0,C22,C23,C31,C32
C21
C24
D1,D2,D3,D4
D5
D6,D7,D8,D9,D10,D11,D1
2,D13
FB1,FB2,FB3
JP1
JP2
JP3
JP4
Value
1.0 uF
470 pF
10 nF
470 uF
0.1 uF
10 uF
0.1 uF
Rating
10 V
25V
16 V
25 V
25 V
16V
16 V
Tolerance
±10%
±5%
±10%
±20%
±10%
±10%
±20%
820 pF
100 uF
DIODE
BAT54C
MMBZ15VDC
50 V
16 V
30 V
±5%
±10%
0.5 A
Item
1
2
3
4
5
6
7
Quantity
5
4
1
1
2
2
10
8
9
10
11
12
1
1
4
1
8
13
14
15
16
17
3
1
1
1
1
18
8
19
20
21
1
1
1
JP5,JP7,JP8,JP9,JP10,JP
11,JP12,JP13
JP6
J1
J2
22
1
J3
23
1
J4
24
25
26
27
28
29
30
31
32
1
1
1
6
1
1
1
2
10
33
34
35
36
37
1
1
1
1
1
38
39
40
3
4
8
41
42
43
44
45
46
2
1
1
1
1
1
2.1 mm Power
jack
J5
USB Type B
LS1
Speaker
RJ11
MTJG-2-64-2-2-1
R2,R6,R7,R9,R15,R27
0
R3
47 k
R4
3k
R5
10
R26,R8
1.3k
R10,R11,R12,R17,R18,R1
10k
9,R28,R29,R30,R33
R13
1.6
R14
196k
R16
110k
R20
4.7 k
S1
SW
PUSHBUTTON
TP1,TP2,TP18
Black Test Point
TP3,TP4,TP5,TP6
Stand off
TP7,TP8,TP10,TP11,TP12, Blue Test Point
TP13,TP14,TP15
TP16,TP17
Red Test Point
TP19
Blue Test Point
U1
7805
U2
TPS77601DR
U3
DS1818
U4
MAX3237
47
48
49
50
51
1
2
1
1
1
U5
U8,U7
U9
U10
U11
Foot Print
3216_EIAA
CC0805
CC0603
C5X10MM-RAD
CC0805
CC1206
CC0603
Dielectric
Tant
X7R
X7R
Electrolytic
X7R
X7R
X7R
Manufacturer Number
TA010TCM105-KAL
C0805C471J5GACTU
C0603X7R160-103KNE
UVX1E471MPA
C0805X7R250-104KNE
C1206X7R100-106KNE
C0603X7R160-104MNE
Manufacturer
Venkel
TTI
Venkel
NIC Components
Venkel
Venkel
Venkel
CC0805
NPO
C2.5X6.3MM-RAD Electrolytic
SOD123
SOT-23
SOT-23
C0805COG500-821JNE
UVX1C101MEA1TD
MBR0530T1
BAT54C
MMBZ15VDC
Venkel
Nichicon
Motorola
Diodes Inc.
General Semiconductor
Ferrite Bead
SOCKET 8X2
4X1 Socket
HEADER 8X2
HEADER 5X2
RC0805
CONN2X8
CONN4[6238]
CONN2X8
CONN2X5[6238]RA
BLM21A601S
SSW-108-01-T-D
SSW-104-01-T-S
517-6121TN
TSW-105-25-T-D-RA
Murata
Samtec
Samtec
Samtec
Samtec
2X1 Header
CONN2[6040]
517-611TN
Berg
3x5 Header
DB9-RS232_1
RCA JACK
CONN3X5
CONN9[6543]DBF
CONN2[12090]RC
A
TB2[12065]TSA
K22-E9S-030
16PJ097
Kycon
Mouser
506-5ULD02
Mouser
Power Connector
CP2101/02
74CBT3257/SO
PDIP Socket
OP-AMP
GMS05F
1/10 W
1/10 W
1/10 W
1/10 W
1/16 W
1/16 W
±5%
±5%
±1%
±5%
±5%
1/8 W
-0.05
1/10 W
±5%
CONN3[175120]P
WR
CONN-USB-B
HCM12A[9052]
RJ11[6238]DUAL
RC0603
RC0805
RC0805
RC0805
RC0603
RC0603
ADC-002-1
Adam Tech
897-30-004-90-000000
HCM1206A
MTJG-2-64-2-2-1
CR0603-10W-000JT
NRC10J473TR
NRC10J302TR
NRC10F10R0TR
CR0603-16W-132JT
CR0603-16W-103JT
Mill-Max
JL World
Adam Tech
Venkel
NIC Components
NIC Components
NIC Components
Venkel
Venkel
RC1206
RC0805
RC0805
RC0805
SW4[6240]PB
CR1206-8W-1R6JT
MCHRIDEZHFX1963E
CR21-114J-T
NRC10J472TR
101-0161
Venkel
Classic Comp
Classic Comp
NIC Components
Mouser
CONN1[6040]
MH-125
CONN1[6040]
151-203
Mouser
151-205
Mouser
CONN1[6040]
CONN1[6040]
TO-220-LD
SO8
SOT-23
SOP65X780-28N
151-207
151-207
uA7805CKC
TPS77601DR
DS1818-10
MAX3237E (Sipex
SP3238E 2nd source)
CP2101/02
SN74CBT3257DBR
210-93-308-41-001000
LM386M-1
GMS05F
Mouser
Mouser
Texas Instruments
Texas Instruments
Dallas Semiconductor
Maxim
28-pin MLP
SOP65X780-16N
DIP8-SKT
SO8
SOT-23-5N
Rev. 1.0
Silicon Laboratories
Texas Instruments
Mill-Max
National Semi
Vishay
19
Figure 17. Daughter Card Component Side Silkscreen
Si2435/17FT18-EVB
20
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Figure 18. Daughter Card Solder Side Silkscreen
Si2435/17FT18-EVB
Rev. 1.0
21
Figure 19. Daughter Card Component Side Layout
Si2435/17FT18-EVB
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Figure 20. Daughter Card Solder Side Layout
Si2435/17FT18-EVB
Rev. 1.0
23
Figure 21. Motherboard Silkscreen
Si2435/17FT18-EVB
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Figure 22. Motherboard Silkscreen (Back Side)
Si2435/17FT18-EVB
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Figure 23. Motherboard Component Layout
Si2435/17FT18-EVB
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Figure 24. Motherboard Solder Side Layout
Si2435/17FT18-EVB
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27
Figure 25. Motherboard Ground Plane Layout
Si2435/17FT18-EVB
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Figure 26. Motherboard Power Plane Layout
Si2435/17FT18-EVB
Rev. 1.0
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Si2435/17FT18-EVB
6. Complete Design Package on CD (See Sales Representative for Details)
Silicon Laboratories can provide a complete design package of the Si2435/17-EVB including the following:

OrCad Schematics
Gerber Files
 BOM
 Documentation
Please contact your local sales representative or Silicon Laboratories headquarters sales for ordering information.

30
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Si2435/17FT18-EVB
NOTES:
Rev. 1.0
31
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