SI2400-FS

Overview

The Si2400-FS is a complete ISOmodem chipset with an integrated Direct Access Arrangement (DAA) designed for embedded modem applications. It combines a DSP data pump, modem controller, analog front end, and audio codec into two 16-pin SOIC packages. The device supports V.22bis at 2400 bps, V.22/V.23/Bell 212A at 1200 bps, and V.21/Bell 103 at 300 bps. It features programmable line interfaces compliant with global standards including FCC, CTR21, and JATE. Key capabilities include caller ID detection, DTMF generation/detection, HDLC framing, and voice codec support. Operating voltages are 3.3V or 5.0V, with low power consumption modes.

Feature Summary

• Integrated capacitive isolation DAA eliminates the need for external transformers or opto-isolators.
• Supports multiple communication protocols including V.22bis, V.23 reversing, and SIA security formats.
• Built-in caller ID decoding for US, UK, and Japanese formats with parallel phone detection.
• Hardware HDLC framing enables V.42 error correction without host CPU intervention.

Applications

• Set top boxes
• Power meters
• Security systems
• ATM terminals
• Medical monitoring devices

Procurement Notes

Verify the specific suffix 'FS' against the manufacturer's ordering guide to confirm package type and temperature grade. Ensure the design includes the companion Si3015 component if required by the application schematic. Confirm that the selected voltage supply matches the digital logic levels supported by the UART interface.

Selection Notes

Select this component for applications requiring global telephone line compliance in a compact form factor. Consider the integrated DAA to reduce bill of materials complexity. Evaluate power consumption requirements against the available low-power modes. Verify that the host microcontroller can support the required UART baud rates and AT command set.

Part Context

The Si2400 is part of Silicon Laboratories' ISOmodem family, designed to replace discrete modem solutions. It integrates functions typically handled by separate DSPs, AFES, and isolation components. The chipset simplifies design by providing a single interface to the PSTN while maintaining safety and regulatory compliance through internal circuitry.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's current product selector guide for updated alternatives or pin-compatible options.