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SI2400URT-EVB Datasheet(PDF) 4 Page - Silicon Laboratories |
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SI2400URT-EVB Datasheet(HTML) 4 Page - Silicon Laboratories |
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4 / 22 page  Si2400URT-EVB 4 Rev. 0.6 Power Requirements The Si2400URT-EVB has an on-board diode bridge, filter capacitor, and voltage regulator (U8). 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 Si2400URT-EVB through the screw terminals (J3) or the 2 mm power jack (J4). The on-board full-wave rectifier and filter ensures the correct polarity is applied to the Si2400URT-EVB. Daughter card power is supplied through voltage regulator U7 and is factory set at 3.3 V by connecting JP7 pins 1 and 2. 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 low impedance ammeter may result in damage to the Si2400URT-EVB. 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 serial port on a PC to the DB9 connector on the Si2400URT-EVB with a pass-through cable. The RS-232 transceivers on the EVB can communicate with the DTE at rates up to 230.4 kbps. Any standard terminal program such as HyperTerminal or ProComm running on a PC will communicate with the Si2400URT-EVB. Configure the terminal emulation program to 2400 bps, 8 data bits, no parity, one stop bit, and no handshaking. 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. 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 again type “AT<CR>”. 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 will make 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 will appear indicating the two modems are in the data mode and communicating. Typing on one terminal should appear on the other terminal. To return to the command mode without interrupting the connection between the two modems, type “+++.” Approximately two seconds later “O” will appear. The modem is now in command mode and will accept “AT” commands. This assumes the command ATS14=20 was issued during the initial modem configuration to enable “+++” escape. To return to the data mode, type “ATO.” The modem will resume the data connection and no longer accept AT commands. Type “ATH” to terminate the data connection. Echo control effects data and command mode. To turn off the character echo, type “ATEO”. Si2400URT-EVB Functional Description The Si2400URT-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 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™. 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. This is particularly useful for directly connecting the Si2400 to embedded systems. The Si24xxURT-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 can be powered by 5.0 V or 3.3 V. The motherboard is factory configured for 3.3 V. It is recommended that JP7 pins 1 and 2 are connected any time the daughter card is used in conjunction with the motherboard. This ensures no damage will occur to the Si2456/33/14DC if used with this motherboard. JP2 is a 4x1 socket providing connection between the daughter card, the RJ-11 phone jack and chassis ground. |
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