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S i 2 4 0 0 U R T- E V B
EVALUATION BOARD FOR THE Si2400
WITH A UART INTERFACE
Description
The Si2400URT-EVB evaluation board provides the
system designer an easy way to evaluate the Si2400
ISOmodem®. The Si2400URT-EVB consists of a
motherboard and power supply, an RS-232 interface
and USB, other ease-of-use features, and a complete,
removable modem module on a daughter card. (A
functional block diagram of the Si2400URT-EVB is
shown below.) The Si2400 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
two 16-pin small outline (SOIC) packages, the Si2400
ISOmodem eliminates the need for a separate DSP
data pump, modem controller, memories, analog front
end (AFE), isolation transformer, relays, opto-isolators,
and a 2- to 4-wire hybrid. The Si2400 is ideal for
embedded modem applications due to its small board
area, controller-based architecture, low power
consumption, and global compliance. The Si2400URTEVB provides an RJ-11 jack and a DB9 connector for
interfacing the Si2400URT-EVB to the phone line and a
PC or data terminal serial port. This allows the Si2400
ISOmodem to operate as a serial modem for
straightforward evaluation. To evaluate the Si2400
ISOmodem in an embedded system, the daughter card
can be used independently or with the motherboard. A
direct access header (JP3) is available on the
motherboard to bypass the RS-232 transceivers and
connect the Si2400 ISOmodem directly to a target
system. The EVB also provides test points for access to
the analog input and analog output. These interfaces
can be used to evaluate the Si2400 PCM and voice
modes. Given that any of the GPIO pins may be used
as an audio input, the EVB provides access to all GPIO
pins.
Power is supplied through a screw terminal (J3) or a
standard 2 mm power jack (J4). An onboard rectifier,
filter, and voltage regulator allow the power input to be
7.5–13 V ac or dc (either polarity). Alternatively, power
can be supplied through the USB interface (whether or
not the USB interface is used). The Si2400URT-EVB
can drive an external speaker for call monitoring, or a
piezoelectric speaker can be mounted directly on the
board in the space provided.
Features
The Si2400URT-EVB includes the following:
Dual RJ-11 connection to phone line
RS232 and USB interface to PC
Audio connector for call monitoring
Direct access to Si2400 for embedded application
evaluation
Easy power connection to common 7.5–13.5 V
power supplies
9 V ac adaptor
Simple installation and operation
Functional Block Diagram
Audio
Out
9 V dc at 300 mA ac
Adaptor
Audio
Amplifier
7.5–13.5 V dc or
peak ac
USB
Connector
Rectifier
Filter
Voltage
Regulator
3.3 V
Direct
Access HDR
Daughter Board Boundary
5V
USB I/P
UART
DB9
RS-232
Transceivers
Interface
Selection
Jumpers
Phone
Line
AOUT
Si3015
Si2400
RESET XTALO
Interface
Circuit
RJ-11
XTALI
Push Button
Reset
Power-On
Reset
Rev. 0.7 3/06
Copyright © 2006 by Silicon Laboratories
Si2400URT-EVB
Si2400URT-EVB
1. Introduction
Table 2. Modem Initialization Example
Notable differences between the Si2400 and other
ISOmodem products are highlighted in the bulleted list
below. For complete details and specifications, please
refer to the current Si2400 data sheet.
Unique Si2400 Features:
Many AT commands execute when entered without
<CR>.
AT commands must be entered in uppercase.
The +++ escape sequence is disabled at power-up
and/or reset.
Command
ATS00=02
Auto-answer after two rings
ATS07=06
Configures modem for V.22b
ATS14=20
Enables +++ escape
ATSF4=00
Removes audio mute
ATSE4=02 Turns on audio ADC and DAC
ATS14=20 enables +++ escape.
ATM1
S-Register address and value are entered in hex
(example: ATS0F=2B)
Result codes are abbreviated (example: “O” instead
of “OK”).
The Si2400DC power can be 3.3 V or 5 V (3.3 V
used on motherboard).
Several AT commands are required to enable the
speaker.
ATSF4=00 removes Tx and Rx audio mute.
ATSE4=02 turns on ADC and DAC power.
ATM2 turns on speaker continuously.
DTE interface default is 8N1, 2400 bps, no
handshaking, and no linefeeds with carriage returns.
ATDT is disabled if linefeeds with carriage returns
are enabled.
Some common AT Commands are not available:
V.22
02
V.21
03
Bell 212A
00
Bell 103
01
V.23 (1200 TX, 75 RX—Answer)
14
V.23 (75 TX, 1200 RX—Originate)
24
V.23 (600 TX, 75 RX—Answer)
10
V.23 (75 TX, 600 RX—Originate)
20
2
This section explains how to set up the Si2400URT-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. After power is applied, initial modem
setup instructions and a basic tutorial on modem
operation are provided. Si2400URT-EVB configurations
for evaluating additional features are discussed
separately.
2.1. Si2400URT-EVB Quick Start—RS-232
Interface
DB-9 to PC COM 1 (with a pass-through cable).
RJ-11 to phone line or test box.
the 9 V ac adaptor (or USB cable).
3. Bring up:
ATS07 =
06
2. Si2400URT-EVB Setup and
Evaluation
2. Connect:
Table 1. Modem Configuration Examples
V22bis
Turns on speaker until carrier negotiated
1. Set jumpers according to Figure 1.
ATH1
A/
ATD (must be ATDT or ATDP)
AT&Tn (use ATSE4=20 for local digital loopback)
Modulation
Function
Turn on power to modem.
Set Terminal Program for 2400 bps 8N1.
Hardware flow control. Disable linefeeds with
carriage returns (linefeeds with carriage returns
disable ATDT commands).
4. Type “AT” followed by a carriage return.
Should echo “AT” and then an “O”.
5. Type:
ATS14 = 20 to enable +++ escape.
ATS07 = 06 to enable V.22b.
ATS00 = 01 for auto-answer on first ring.
Rev. 0.7
Si2400URT-EVB
2.2. Si2400URT-EVB Quick Start—USB
Interface
6. Type “AT” followed by a carriage return.
Should echo “AT” and then an “O”.
7. Type:
1. Set jumpers according to Figure 2.
ATS14=20 to enable +++ escape.
ATS07=06 to enable V.22b.
ATS00=01 for auto-answer on first ring.
2. Connect:
USB cable to PC.
RJ-11 to phone line or test box.
3. Download USB driver for your operating system from
the CD supplied with the evaluation board.
4. Install driver.
5. Bring up:
Reset the modem.
Set Terminal Program for 2400 bps 8N1.
Hardware flow control. Disable linefeeds with
carriage returns (linefeeds with carriage returns
disable ATDT commands).
2.3. Jumper Settings
Check all jumper settings on the Si2400URT-EVB
before applying power. Figure 1 shows the standard
factory jumper settings. These settings configure the
Si2400URT-EVB for RS-232 serial operation. Any
standard terminal program configured to communicate
through a PC COM port can be used to communicate
with the Si2400URT-EVB. To connect the modem
directly into an embedded system with LVCMOS/TTL
levels, install JP8 to disable both the RS-232 and USB
interfaces. Connection to the embedded system can be
made to JP-3. Place a jumper on JP13 to enable the
onboard speaker, LS1.
Figure 1. Jumper Settings—RS-232 Interface (Outlined in Gray)
Rev. 0.7
3
Si2400URT-EVB
Figure 2. Jumper Settings—USB Interface (Outlined in Gray)
2.4. Power Requirements
The Si2400URT-EVB has an onboard diode bridge,
filter capacitor, and voltage regulator. Power can be
supplied from any source capable of providing 7.5–13 V
dc or 7.5–13 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 Si2400URT-EVB through the screw terminals (J3)
or the 2 mm power jack (J4). The onboard full-wave
rectifier and filter ensure that the correct polarity is
applied to the Si2400URT-EVB. Daughter card power is
supplied through voltage regulator U2 and is factory set
at 3.3 V. Power is also supplied by the USB cable and
can be used regardless of whether the modem is
configured for USB, RS-232, or direct interface mode.
Daughter card current can be measured by connecting
an ammeter between JP7 pins 1 and 2. These pins
must always be connected. Failure to connect pins 1
and 2 of JP7 through either a jumper or a lowimpedance ammeter may result in damage to the
Si2400URT-EVB.
2.5. Terminal and Line Connections
The Si2400 can be tested as a standard serial data
modem by connecting the Si2400URT-EVB to a
personal computer or other data terminal equipment
(DTE), phone line, and power. Connect a PC, RS-232,
or USB interface to the Si2400URT-EVB with the
appropriate cable. The RS-232 transceivers on the EVB
can communicate with the DTE at rates of up to 1 Mbps.
4
Any standard terminal program, such as HyperTerminal
or ProComm, running on a PC can communicate with
the Si2400URT-EVB. Configure the terminal emulation
program to 2400 bps, 8 data bits, no parity, one stop bit,
and hardware flow control. Also, be sure to disable
linefeeds with carriage returns. Connect the RJ-11 jack
on the Si2400URT-EVB to an analog phone line or
telephone line simulator, such as a Teltone TLS 5.
2.6. Making Connections
With the terminal program properly configured and
running, apply power to the Si2400URT-EVB. Type
“AT<CR>”, and the modem should return “O”, indicating
the modem is working in the command mode and
communicating with the terminal. If the “O” response is
not received, try resetting the modem by pressing the
manual reset switch (S1); then type “AT<CR>” again.
Ensure that sure all commands are entered using
uppercase letters.
To take the modem off-hook, type “ATDT<CR>.” The
modem should go to the off-hook state, draw loop
current, and respond with a “t”, indicating a dial tone
detection. Typing any characters makes the modem
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 “c” 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
Rev. 0.7
Si2400URT-EVB
interrupting the connection between the two modems,
type “+++.” Approximately two seconds later, “O” will
appear. The modem is now in command mode and will
accept “AT” commands. To return to the data mode,
type “ATO.” The modem resumes the data connection
and no longer accepts AT commands. Type “ATH” to
terminate the data connection.
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.
3. Si2400URT-EVB Functional
Description
The Si2400 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, then go high with a rise time <100 ns.
Most production Si2400 modem chipset applications
require that RESET be controlled by the host processor.
Certain Si2400 operation modes, including Powerdown,
require a hardware reset to recover.
The Si2400URT-EVB is a multipurpose evaluation
system. The modem daughter card illustrates the small
size and small number of components required to
implement an entire controller-based modem with
global telecommunications 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 Si2400 ISOmodem®.
3.1. Motherboard
The motherboard provides a convenient interface to the
Si2400DC (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 Si2400URT-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
Si2400, bypassing the RS-232 transceivers or USB
interface. This is particularly useful for directly
connecting the Si2400 to embedded systems.
The Si2400URT-EVB motherboard connects to the
daughter card through two connectors, JP1 and JP2.
JP1 is an 8x2 socket providing connection to all Si2400
digital signals and regulated 3.3 V power for the Si2400.
The Si2400 digital signals appearing at JP1 (daughter
card interface) are LVCMOS and TTL compatible. The
Si2400DC must be powered by 3.3 V. The motherboard
is factory-configured for 3.3 V with JP7 pins 1 and 2.
JP2 is a 4x1 socket providing connection between the
daughter card and the RJ-11 phone jack.
3.1.1. 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. C50 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
3.1.2. Reset Circuitry
The Si2400URT-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 6
on page 12 and Figure 8 on page 14 for the reset circuit
schematic.
3.1.3. 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. Upon 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.
3.1.4. Manual Reset
The manual reset switch, S1, performs a power-on
reset. This resets the Si2400 to factory defaults without
turning off power. If S1 is used in conjunction with U6,
pressing S1 activates the reset monitor in the DS1818
and produces a 220 ms active low reset pulse.
3.1.5. Interface Selection
The serial interface of the Si2400USB-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 Si2400 can be tested as a standard data modem by
connecting the Si2400USB-EVB to a personal computer
or other DTE, power supply, and a phone line. A PC can
communicate with the Si2400USB-EVB using a
standard terminal program, such as HyperTerm or
ProComm.
Jumper settings determine how the Si2400USB-EVB is
Rev. 0.7
5
Si2400URT-EVB
connected to the DTE. Table 3 lists the interface controlled by each motherboard jumper. See Figure 7 on page 13
and Figure 17 on page 23.
Table 3. Interface Selection Jumpers
Jumper
Function
JP1
Daughter Card Phone Line Connector.
JP2
Daughter Card Digital Connector.
JP3
Direct Access Header.
JP4
Not Used.
JP5
USB Enable (RS-232 Disable).
JP6
Options.
JP7
3.3 V Power for Daughter Card.
JP8
Disable both RS-232 and USB.
JP9
Not Used.
JP10
Not Used.
JP11
Not Used.
JP12
Enable 27 MHz Clock Option.
3.1.6. 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 Si2400 and,
using internal charge pumps, makes these signals compatible with the RS-232 standard. The RS-232 transceiver
on the Si2400USB-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 Si2400USB-EVB serial interface
(DB9 connector) are listed in Table 4.
Table 4. DB9 Pin Connections
J1 Name
J1 Symbol
J1 Pin
Si2400 Name
Carrier Detect
CD
1
Received Data
RXD
2
5
RXD
Transmit Data
TXD
3
6
TXD
Data Terminal Ready
DTR
42
14
ESC/GPIO3
SG
5
12
GND
Data Set Ready
DSR
6
Note 3
Ready to Send
RTS
7
nc
Clear to Send
CTS
8
7
Signal Ground
Ring Indicator
RD
9
Notes:
1. JP6 + JP5 jumper option.
2. JP6 Jumper option.
3. DSR connected to DTR at J1.
6
Si2400 Pin
1
Rev. 0.7
1
nc
CTS
Si2400URT-EVB
3.1.7. 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.
3.1.8. 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 Si2400 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. Figure 3 illustrates the jumper settings required for
the direct access mode using the motherboard.
Figure 3. Jumper Settings for Direct Access Interface
Rev. 0.7
7
Si2400URT-EVB
3.1.9. Audio Output
3.2. Modem Module Operation
Audio output is provided from the Si2400 on the pin,
AOUT. 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 Si2400URT-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.
The Si2400URT-EVB daughter card is a complete
modem solution perfectly suited for use in an embedded
system. 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.
3.1.10. 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 to prevent 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 highfrequency 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 high current pnp transistor in the
LM386 output stage on negative signal peaks. These
oscillations can occur between 2–5 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.
8
3.2.1. Reset Requirements
The Si2400 ISOmodem daughter card must be properly
reset at powerup. The reset pin (pin 8) of the Si2400,
(JP1, pin 13), must be held low for at least 5.0 ms after
power is applied and stabilized and returned high with a
rise time less than 100 ns to ensure the device is
properly reset.
3.2.2. 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.
3.2.3. Protection
The Si2400URT-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
Si2400URT-EVB provides isolation to 3 kV. Contact
Silicon Laboratories for information about designing to
higher levels of isolation.
Rev. 0.7
VCC
C10
2
Y1
RXD
TXD
CTS_N
RESET_N
CLKOUT
1
C26
U1
Si2400
XTALI
XTALO
CLKOUT
VD
RXD
TXD
CTS
RESETB
JP2
1
2
3
4
5
6
7
8
GPIO1
GPIO2
GPIO3
ISOB
GND
C1A
GPIO4
AOUT
16
15
14
13
12
11
10
9
Rev. 0.7
RING
TIP
GPIO4
AOUT
GPIO1
GPIO2
GPIO3
C3
Z4
R27
2
3
D3
C30
C1A
Figure 4. Si2400 Schematic
C30 may be used
for reducing
emissions.
1
C27
CLKOUT
RXD
TXD
CTS_N
RESET_N
VCC
C40
2
4
6
8
10
12
14
16
HEADER 8X2
1
3
5
7
9
11
13
15
JP1
GPIO1
GPIO2
GPIO3
GPIO4
AOUT
Si2400URT-EVB
4. Design
The following pages contain the schematics, bill of materials, and layout for the Si2400, including the daughter card
and motherboard.
9
C41, C42, C43, C44 are provided for
different population options to allow
for surge testing greater than 3kV.
C1A
C4
C44
C41
C1
C9
R8
R28
R7
R15
1
2
3
4
5
6
7
8
U2
Si3015
Rev. 0.7
R9
C14 +
R12
R13
R2
C5
R25
R26
Z1
C42
C43
Q4
R19
C25
R17
R5
C41, C42, C43, C44 are provided for
different population options to allow
for surge testing greater than 3kV.
C22
R18
R24
Figure 5. Si3015 DAA Schematic
C7
D1
R11
+
C18
R10
C6
C16
C12
D2
C8
Z5
16
15
14
13
12
11
10
9
C13
C19
3
D4
TSTA/QE2 TX/FILT2
TSTB/DCT NC/FILT
IGND
RX
C1B
REXT
RNG1
DCT/REXT2
RNG2
NC/REF
QB
NC/VREG2
QE
VREG
2
10
+
1
C24
R16
Q1
Q2
C38
C39
Q3
L1
L2
C20
R6
R31
R32
FB1
FB2
RV1
1
F1
2
F1 may not be needed.
See the section on
UL1950 in AN17 for
details.
RING
TIP
Unless specified otherwise, resistors are
+/-5 %, 1/16 W
Unless specified otherwise, capacitors are
+/- 20 %, 16V
All traces in the DAA area (enclosed in box)
must be separated from other circuits by 2.5
mm spacing for global safety compliance.
This spacing applies to the terminals
between each isolation capacitor. The
isolation capacitors are as follows: C1, C4,
C24, C25.
Refer to Appendix B and Application Note
AN48 for Layout Guidelines
Si2400URT-EVB
Si2400URT-EVB
Table 5. Si2400 Daughter Card Bill of Materials
Component
C1,C4
C3,C13
C5
C6,C10,C16
C7,C8
C9
C12
C14
C18,C19
C20
C22
C24,C25
C26,C27
C38,C39
D1,D2
D3,D4
FB1,FB2
F1
JP1
JP2
L1,L2
Q1,Q3
Q2
Q4
RV1
R2
R5
R6
R7,R8,R15–17, R19
R9,R10
R11
R12
R13
R18
R24
R25,R26
R27,R28
R31,R32
U1
U2
Y1
Z1
Z4,Z5
Value
150 pF, 3 kV, X7R, ±10%
0.22 µF, 25 V, X7R, ±20%
0.1 µF, 50 V, Tant, ±20%
0.1 µF, 16 V, X7R, ±20%
560 pF, 250 V, X7R, ±10%
22 nF, 250 V, X7R, ±10%
1.0 µF, 35 V, Tant, ±10%
0.68 µF, 16 V, Tant, ±10%
3.9 nF, 16 V, X7R, ±10%
0.01 µF, 16 V, X7R, ±10%
1800 pF, 50 V, X7R, ±10%
1000 pF, 3 kV, X7R, ±10%
33 pF, 16 V, NPO, ±5%
47 pF, 16 V, X7R, ±10%
Dual Diode, 225 mA, 300 V
BAV99, 300 mA, 100 V
Ferrite Bead
Fuse
HEADER 8x2
4x1 Header_0
68 µH, 150 mA, 4 Ω max, ±10%
NPN, 300 V
PNP, 300 V
NPN, 80 V
SiDactor, 275 V, 100 A
402 Ω, 1/16 W, ±1%
100 kΩ, 1/16 W, ±1%
120 kΩ, 1/16 W, ±5%
5.36 kΩ, 1/4 W, ±1%
56 kΩ, 1/10 W, ±5%
9.31 kΩ, 1/16 W, ±1%
78.7 Ω, 1/16 W, ±1%
215 Ω, 1/16 W, ±1%
2.2 kΩ, 1/10 W, ±1%
150 Ω, 1/10 W, ±5%
10 MΩ, 1/10 W, ±5%
10 Ω, 1/16 W, ±5%
470 Ω, 1/16 W, ±5%
Si2400
Si3015
4.9152 MHz, 20 pF load, 150 ESR,
50 ppm
Zener, 43 V, 300 mW
Zener, 5.6 V, 500 mW
Supplier*
Novacap
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
AVX
Venkel
Venkel
Venkel
Novacap
Venkel
Venkel
Central Semiconductor
Diodes, Inc.
Murata
Teccor
Samtec
Berg
Murata
Motorola
Motorola
Motorola
Teccor
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Venkel
Silicon Labs
Silicon Labs
CTS Reeves
General Semi
Diodes, Inc.
*Note: Many other suppliers are available. See the Si2400 data sheet.
Rev. 0.7
11
Rev. 0.7
1
2
2.1 mm Power jack
J4
1
2
Power Connector
"7-12V AC or DC"
J3
M2
M1
SG
DTR(i)
TXD(i)
RXD(o)
CD(o)
1
2
3
4
USB
11
10
5
4
3
2
1
J5
USB Type B
5
9
8
7
6
B3
DB9-RS232_1
J1
RD(o)
CTS(o)
RTS(i)
DSR(o)
RS-232
V2
V1
USB_+5
SW PUSHBUTTON
12
S1
"RESET"
RESETb
PowerBlock
R1
NI
0
B2
JP7
VCC
JP8
OE
"USB"
VD
EESD_H
"AUTOBAUD"
JP9
R10
10k
HEADER 8X2
"CLKOUT"
"TXCLK"
"RTSb"
"RXD"
"TXD"
"CTSb"
"RESETb"
TXCLK_H
"EEPROM"
JP10
R11
10k
2
4
6
8
10
12
14
16
Si2456/57
DCD or EEIO
RI or TXCLK
ESC or X
RTS or RXCLK
INT or AOUT
DC D_H
R12
10k
"27MHz CLK"
JP11
15
12
9
6
3
Si2401
GPIO2 or nc
nc or GPIO5
GPIO3 or nc
nc or GPIO1
nc or GPIO4
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"
for JP6
Si2400 only
nc or GPIO2
GPIO3 or nc
GPIO1 or GPIO3
CLKOUT or nc
GPIO4 or AOUT
14
13
11
10
8
7
5
4
JP6
Place White Dot
Silkscreen Near
Pin 1
AOUT_H
"ESC"
"EESD"
"RIb"
"INT"
"AOUT"
1
DC D_H
2
2
4
6
8
10
HEADER 5X2
"PCM"
1
3
5
7
9
Right angle connector on board edge
JP4
"RXCLK"
"DCDb"
Place White Dot
Silkscreen Near
Pin 1
1
3
5
7
9
11
13
15
JP3
RESETb
Table on silkscreen
RS-232 Function
Info
CD
Info
RI
Ctrl
DTR
Ctrl
RTS
Info
DSR
TXCLK_H
RESETb
Si24xx Reset Options
JP5
DSR_M
RTS_M
DTR_M
RI_M
CD_M
RXD_M
TXD_M
CTS_M
UART Mux
R2
Figure 6. Motherboard Top-Level Schematic
JP7 for measuring
current to modem (i.e.
VD goes to modem only)
R8
1.3k
RI_U
RI_U
DTR_U
CD_U
DTR_U
CD_U
DSR_U
CTS_U
RTS_U
CTS_U
RTS_R
TXD_U
DSR_U
RXD_U
TXD_U
RI_T
RXD_U
CD_T
DTR_T
DSR_T
RTS_T
CTS_T
TXD_T
RXD_T
RI_T
"Mux off"
B4
CD_T
DTR_T
DSR_T
RTS_T
CTS_T
TXD_T
RXD_T
VD
+3.3V
USB
USBUSB+
RS-232
RD_R
CTS_R
RTS_R
DSR_R
B1
S
DTR_R
TXD_R
RXD_R
CD_R
R6
R7
B5
AOUT
C32
0
SDO
JP13
J2
VCC
"EEPROM"
HOLD
WP
CS
SCLK
SDI
RCA JACK
NI
8
7
3
1
6
5
R27
U9
RING
TIP
Daughter Card Socket
EESD_H
EECS_H
EECLK_H
EESD_H
SPEAKER
VCC
+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
2
R9
0
"TIP"
TP7 "RING"
TP8
1
2
3
4
5
6
7
8
9
10
11
12
Speaker
LS1
RJ11
Si2400URT-EVB
RESET
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. 0.7
Si2401
NC
GPIO1
GPIO5
GPIO2
NC
GND
TXD
GPIO3
RXD
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 7. Daughter Card Interface Schematic
Table NOT on silkscreen
JP1/3
Si2400
Si24xx
1
NC
CLKOUT/A0/EECS
2
NC
EECLK/D5/RXCLK
3
NC
alt_RIb/TXCLK/D6
4
NC
DCD/D4
5
CLKOUT
RTS/D7
GND
GND
6
TXD
TXD/WR
7
GPIO1
ESC/D3
8
RXD
RXD/RD
9
GPIO2
EESD/D2
10
CTS
CTS/CS
11
GPIO3
RI/D1
12
RESET
RESET
13
GPIO4
INT/D0
14
15
VD
VD
16
AOUT
AOUT/INT
Net names correspond to
Si24xx. See table for
Si2400 equivalents
+
R17
10k
VD
Si2400URT-EVB
13
V2
V1
D2
D4
D1
D3
+
C6
470 uF
C7
0.1 uF
1
IN
U1
Rev. 0.7
TP6
TP5
TP4
TP3
Standoffs in each corner of board.
1.6
R13
USB_+5
1
2
TP18
TP2
TP1
"GND"
"GND"
"GND"
C8
10 uF
D5
C9
0.1 uF
BAT54C
VCC
4
3
2
1
U2
OUT(2)
OUT(1)
FB/NC
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 8. Power Supply Schematic
7805
3
FB1
OUT
10 nF
C5
GND
14
2
USB_VCC
+3.3V
VD
C11
470 pF
R15
3
2
RST
0
DS1818
GND
VCC
U3
OPTIONAL
1
RESET
Si2400URT-EVB
Rev. 0.7
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 9. 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
2
VCC
MAX3237
EN
R3OUT
R2OUT
R1OUT
R1OUTB
T5IN
T4IN
T3IN
T2IN
T1IN
C2-
C2+
C1-
C1+
U4
28
13
18
20
21
16
17
19
22
23
24
3
1
25
R29
10k
TP10
C19
C18
TP11
TXD_T
RTS_T
DTR_T
DSR_T
RI_T
CD_T
CTS_T
RXD_T
Si2400URT-EVB
15
Si2400URT-EVB
VCC
R3
3
7
2
AOUT
47 k
C21
R4
3k
820 pF
-
4
8
0.1 uF
C24
+
5
1
U10
LM386M-1
C23
+
C20
6
1
C22
0.1 uF
2
SPEAKER
100 uF
0.1 uF
R5
10
Figure 10. 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
74CBT3257/SO
Figure 11. UART MUX Schematic
16
Rev. 0.7
DTR_M
DSR_M
CD_M
RI_M
R19
10k
Si2400URT-EVB
USB_VCC
U5
8
7
C29
1.0 uF
+
C31
6
R20
4.7 k
VBUS
RST
REGIN
SUSPEND
12
SUSPEND
11
RI
DCD
DTR
DSR
TXD
RXD
RTS
CTS
2
1
28
27
26
25
24
23
VDD
TP19
9
RI_U
3
GND
U11
1
5
5
4
USB-
2
3
4
GMS05F
DD+
CP2101/02
CD_U
DTR_U
DSR_U
TXD_U
RXD_U
RTS_R
USB+
CTS_U
Figure 12. USB Interface Schematic
Rev. 0.7
17
Si2400URT-EVB
5. Si24xx Motherboard Bill of Materials
18
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
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
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. 0.7
Silicon Laboratories
Texas Instruments
Mill-Max
National Semi
Vishay
Figure 13. Daughter Card Component Side Silkscreen
Si2400URT-EVB
6. PCB Layers
Rev. 0.7
19
Figure 14. Daughter Card Solder Side Silkscreen
Si2400URT-EVB
20
Rev. 0.7
Figure 15. Daughter Card Component Side Layout
Si2400URT-EVB
Rev. 0.7
21
Figure 16. Daughter Card Solder Side Layout
Si2400URT-EVB
22
Rev. 0.7
Figure 17. Motherboard Silkscreen (Front Side)
Si2400URT-EVB
Rev. 0.7
23
Figure 18. Motherboard Silkscreen (Back Side)
Si2400URT-EVB
24
Rev. 0.7
Figure 19. Motherboard Component Side Layout
Si2400URT-EVB
Rev. 0.7
25
Figure 20. Motherboard Solder Side Layout
Si2400URT-EVB
26
Rev. 0.7
Figure 21. Motherboard Ground Plane Layout
Si2400URT-EVB
Rev. 0.7
27
Figure 22. Motherboard Power Plane Layout
Si2400URT-EVB
28
Rev. 0.7
Si2400URT-EVB
7. Complete Design Package on CD (See Sales Representative for Details)
Silicon Laboratories can provide a complete design package of the Si2400URT-EVB including the following:
OrCad Schematics
Gerber Files
BOM
Documentation
Contact your local sales representative or Silicon Laboratories headquarter sales for ordering information.
Rev. 0.7
29
Si2400URT-EVB
DOCUMENT CHANGE LIST
Revision 0.6 to Revision 0.7
Updated from Rev 1.0 motherboard to Rev 3.2
motherboard.
Updated the following figures and tables:
Figures 1,3,5,6,7,8,9,10,11, and 12
Table 6
Added the following figures:
Figures 2,19,20,21,22,23,24
Updated "2. Si2400URT-EVB Setup and Evaluation‚"
on page 2.
30
Rev. 0.7
Si2400URT-EVB
NOTES:
Rev. 0.7
31
Si2400URT-EVB
CONTACT INFORMATION
Silicon Laboratories Inc.
4635 Boston Lane
Austin, TX 78735
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Email: [email protected]
Internet: www.silabs.com
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.
32
Rev. 0.7
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