CMX860
Telephone Signalling
Transceiver
D/860/5 January 2002
Provisional Issue
Features
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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
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Least Cost Routers
Vending Machines
Internet Appliances
Home Management Systems
Remote Meter Reading
Alarm Systems
Cable TV Set-Top Boxes
Advanced Feature Phones
1.1
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.
All on-chip functions and switching arrangements are controlled via a serial bus ('C-BUS'). The CMX860
is designed to operate at 2.7V and utilises CML’s low power DTMF decoder and V.23 / Bell 202 modem
technology. It is available in 28-pin SOIC (D1), TSSOP (E1) and SSOP (D6) packages.
©
2002 Consumer Microcircuits Limited
CMLMICRO [ CML MICROCIRCUITS ]
