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IC manufacturers Silicon Laboratory Inc.

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Silicon Laboratory Inc. Si2435

Evaluation Board for the Si2494/39/38/37/36/35/29/19/18/17


TopologyBoost Converter
Input voltage7.5-13 V
Output 10.1 A
IC revision0.4


The global Si2435/17-EVB evaluation board provides the system designer an easy way of evaluating the Si2435/17 Fax ISOmodem®. The Si2435/17-EVBconsists 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 Si2435/17-EVB is shown below.) The Si2435/17 ISOmodem is a complete controller-based modem chipset with an integrated and programmable direct accessarrangement (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 isideal 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 RS- 232 transceivers and connect the Si2435/17 Fax ISOmodem directly to a target system. 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 thepiezoelectric 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.


  • This evaluation board includes the following:
  • Socketed module with the modem chipset
  • USB or asynch RS232 Serial Interface
  • RJ11 connection to the phone line
  • Onboard relay-excludable RJ11 connection
  • RS232 and USB interface to the PC
  • Direct access to the ISOmodem signals for
  • embedded system evaluation
  • Power from a provided 8.5–13.5 V dc power supply or from the USB port
  • Handset connector (J1)
  • Onboard hookswitch
  • External hookswitch connector
  • Jumper matrix that allows any handset wiring
  • scheme to work with this board
  • Onboard speakerphone microphone
  • RCA jack connector to an optional off-board speakerphone electret microphone
  • Selectable and adjustable electret power supplies for both handset and speakerphone microphones
  • Onboard 300 mW audio power amplifier (into a 4 load) for driving either onboard or external speaker.
  • Onboard voice coil driven loudspeaker for call monitoring
  • LED display of all RS232 signals


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Power Filter Common Mode Choke
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