Brief Description
The CMX860 is a flexible, low-power Telephone Signalling Transceiver IC, designed for use in a wide range of line-powered telephone equipment. The IC combines the functions of a DTMF encoder and decoder, V.23 / Bell 202 modulator and demodulator plus call progression circuitry with analogue switching between line and phone interfaces. Ring detection, local phone off-hook detection and a relay driver for line hook-switch operation are also provided under the control of C-BUS. The ring and hook detectors operate whilst the remainder of the IC is powersaved, generating an interrupt to wake-up the host µC when further processing or signalling is required.

FEATUREs
• V.23 & Bell 202 FSK Tx and Rx
• DTMF/Tones Transmit and Receive
• Line and Phone Complementary Drivers
• Call Progress Decoder
• Dual Tone Detection and Generation
• Simple C-BUS Serial Interface
• Low Power Operation
• ‘Powersave’ Standby Mode

APPLICATIONs
• Least Cost Routers
• Vending Machines
• Internet Appliances
• Home Management Systems
• Remote Meter Reading
• Alarm Systems
• Cable TV Set-Top Boxes
• Advanced Feature Phones