Modem supports voice and M2M
The Si24xx ISOmodem family’s voice feature set is now more comprehensive and offers better performance and audio fidelity than legacy data modem solutions. When combined with the company’s Si3000 voice codec, the Si24xx data modems support handset, speakerphone (full or half-duplex), voice menu and answering machine implementations.
Developers can 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. The voice-capable Si24xx ICs target any system with telephony functions ranging from POS terminals and security systems to video phones and medical monitoring equipment.
In addition to offering a complete suite of ITU-T “V-dot” data communications, compression and error correction protocols, the ISOmodem family supports specialized protocols used in security and POS applications. Standard DTMF generation and detection and user-programmable tone detection and generation give the Si24xx family the flexibility to support non-standard custom protocols through host software.
As part of Silicon Labs “green” solutions, the Si24xx ISOmodem family offers the industry’s lowest power consumption in both active and standby modes. Operating from a single 3.3 V power supply, ISOmodem chipsets draw very little power – 56 mW in normal operation (on-hook, idle). Sleep and Wake-On-Ring (WOR) modes are available to reduce power consumption to 0.3 mW and 15 mW, respectively.
This capability allows a system to appear to be “always on” while consuming very little power and still responding to events on the telephone line. Si24xx ISOmodem ICs are available in a 5 mm x 7 mm QFN package, while developers can use a small, low-cost 32 kHz “watch” crystal instead of the larger, more expensive crystal typically used in embedded modems. The Si24xx devices also offer the option of using a serial peripheral interface (SPI) in addition to UART and parallel interfaces, enabling resource sharing among multiple peripherals.
For more information, visit www.silabs.com/ISOmodem
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