Silicon Labs Si24xx series offers flexible interface options for data-modem applications
Silicon Laboratories
Si24xx ISO modem range
Silicon Laboratories’ next generation of its Si24xx ISO modem range offers advanced voice features, lower power, reduced BOM costs and flexible interface options for a range of data-modem applications.
The Si24xx data modem ICs are designed to address the need for voice and machine-to-machine (M2M) communications for security and home-automation systems, smart utility meters, set-top boxes, point-of-sale (POS) terminals and other electronics systems that connect to the public switched telephone network (PSTN).
The voice-capable Si24xx ICs are suitable for any system with telephony functions, ranging from POS terminals and security systems to video phones and medical monitoring equipment.
When combined with Silicon Labs’ Si3000 voice codec, the Si24xx data modems support handset, speakerphone (full or half-duplex), voice menu and answering-machine implementations.
Developers can easily add telephony and voice functions to any embedded system, without the need for the dedicated voice processing ICs or host-based DSP software required by legacy approaches.
Key specifications
- Voice feature set offers better performance and audio fidelity than legacy data-modem solutions
- Supports specialised protocols used in security and POS applications
- Standard DTMF generation and detection and user-programmable tone detection and generation
- Support non-standard custom protocols through host software
- Operate from a single 3.3V power supply
- Draw 56mW in normal operation (on-hook, idle)
- Sleep and Wake-On-Ring (WOR) modes are available to reduce power consumption to 0.3 and 15mW, respectively
- ISO modem ICs available in a 5 x 7mm QFN package
- Developers can use a small, low-cost 32kHz ‘watch’ crystal
- Offer the option of using a serial peripheral interface (SPI) in addition to UART and parallel interfaces
- Leverage architecture of Silicon Labs’ global silicon data-access arrangement (DAA) solution
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