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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 Si2493/57/34/15/04 Push Button Reset RESET XTALIXTALO Si3018* Interface Circuit RJ-11 Phone line Audio Amplifier AOUT Audio Out Direct Access HDR Daughter Board Boundary Power-On Reset Rectifier Filter RS-232 Transceivers UART DB9 Interface Selection Jumpers Voltage Regulator 3.3 V 5 V 7.5-13.5 V dc or peak ac Adaptor USB Connector USB I/F *Si3010 for Si2404
2 Rev. 0.7 1. Si2493/57/34/15/04-EVB Setup and 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 eval uating addition al 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). RJ-11 to phone line or CO simulator. 9 V ac adaptor (or USB cable). 3. Bring up: Turn on power to modem. Autobaud automatically adjusts modem DTE speed and protocol. 4. Type “AT” followed by a carriage return. Should 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: USB 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. Reset the modem. Autobaud automatically adjusts modem DTE speed and protocol. 6. Type “AT” followed by a carriage return. Should echo “AT” and then an “OK”. 1.3. Motherboard and Daughter Card Configuration The EVB consist of a mother board 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 pr econfigured 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.
Figure 1. Default Motherboard Setup
Rev. 0.7 5 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.
parity, and number of stop bits. simulator, such as a Teltone TLS 5. running, apply power to the Si2493/57/34/15/04-EVB. up (go on-hook) and stop drawing loop current. two numbers indicate the line-side device. See Figure 7. Figure 7. EVB Part Number Example easily connected to a PC or other terminal device. 34/15/04 to embedded systems. daughter card through two connectors, JP101 and JP2.
Rev. 0.7 9 card and the RJ-11 phone jack. 2.1.1. Voltage Regulator/Power Supply The input voltage to either J8 or J9 must be between 7.5 and 13.5 V dc or 7.5 and 13.5 V PEAK 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 po werup 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 opera tion 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 V D 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 V D 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. 2.1.4. 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. 2.1.5. EEPROM Enable (FT Only) Connecting JP34 and JP35 enables the optional EEPROM, U5. See “AN93: Si2457/Si2434/Si2415/ Si2404 Modem Designer’s Guide” for programming details. 2.1.6. Interface Selection The serial interface of th e Si2493/57/34/15/04-EVB can be connected to a comp uter, 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 Si2493/57/34/15/04- EVB 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 us ing 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 ch ip is available for most PC and MAC operating systems on the CD.
available on the daughter card. features controlled by pin strapping. of noise in the audio spectrum. development and is not needed for a production design. dialing and negotiation tones). driven outputs and must not be grounded. Table 3. DB9 Pin Connections
04 Pin
04 Name
Rev. 0.7 11 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.
daughter card and motherboard.
27 Mhz
4.9152 MHz
Figure 8. i2493/57/34/15/04 Schematic
56.2 C10
600 Ohm
Figure 9. Si3018/10 DAA Schematic
- Bill of Materials: Si24xx Daughter Card
Table 4. Si24xx Daughter Card Bill of Materials 12 1 D1 HD04 0.8 A 400 V BRIDGE MiniDIP4 HD04-T Diodes Inc.
Table 4. Si24xx Daughter Card Bill of Materials (Continued)
Connectors for ISOModem module. Net names correspond to Si24xx. Figure 10. Motherboard Modem Interface Schematic
JP12Pwr Amp En. JP12Pwr Amp En. Figure 11. Audio Amplifier Schematic
600 Ohm C96
Figure 12. Power Supply Schematic
Figure 13. RS-232 Interface and USB Interface Schematic
- Bill of Materials: Si24xx Motherboard
Table 5. Si24xx Motherboard Bill of Materials
15 V 225 mW 15 V Zener,
0.8 A 100 V BRIDGE MiniDIP4 HD01-T Diodes Inc. 225 mA 300 V DUAL SOT23-AKC MMBD3004S-7-F Diodes Inc. 14 1 D54 BAV23A 400 mA 200 V DUAL SOT23-KKA BAV23A Diodes Inc.
600 Ohm 200 mA SMT L0603 BLM18AG601SN1 MuRata
1 A BARREL CONN-3-PWR ADC-002-1 Adam Tech
Table 5. Si24xx Motherboard Bill of Materials (Continued)
11 R 3 9 1 0 k 1/10 W ±1% ThickFilm R0603 CR0603-10W-1002F Venkel
Figure 14. Daughter Card Primary Side Silkscreen
Figure 15. Daughter Card Secondary Side Silkscreen
Figure 16. Daughter Card Primary Side Layout
Figure 17. Daughter Card Secondary Side Layout
Figure 18. Motherboard Primary Side Silkscreen
Figure 19. Motherboard Silkscreen (Secondary Side)
Figure 20. Motherboard Primary Side Layout
Figure 21. Motherboard Secondary Side Layout
Figure 22. Motherboard Ground Plane Layout
Figure 23. Motherboard Power Plane Layout
Rev. 0.7 33 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.
34 Rev. 0.7 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 Revision 0.4 to Revision 0.5 Revision 0.5 to Revision 0.6 Added FS (SOIC) Package Option. Revision 0.6 to Revision 0.7 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 35 NOTES:
36 Rev. 0.7 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. 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. 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, rep- resentation 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 conse- quential 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 per- sonal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap- plication, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.