HomedatasheetDE8661

DE8661 Datasheet

Demoand Evkit For CMX866 And Daa Design
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Features

or CTR21 DAA Single 5V dc power supply operation Break-off PCB sections support 'desktop' and 'socket' modem use PCB layout data provided

CMX866-based socket modem Reference Design Fully Isolated 2-Wire Line Interface Opto Isolated Ring Detect Circuitry and OptoMOS Hook Relay Integral AT Command Set with 'Fast Connect' PC Controlled via Terminal Emulator

The DE8661 Demonstration Board is a reference design for the CMX866 V.22 bis AT command modem IC. The main "socket modem" section contains the CMX866 and associated components in addition to the line interface components. Attached to the main section are two break-off sections which contain 9pin D type socket for PC serial communications, RJ11 line connector, supply voltage connector and a hook-state LED. The CMX866 contains an on-chip �Controller, which interprets AT Commands issued via a standard terminal emulator program running on a host PC or via an external �Controller. Interfacing to the Demonstration Board can be via socket pins on the socket modem section, or via the connectors provided on the break-off sections. The board can be operated or 5V dc, which must be provided by an external, regulated power supply. The PCB has been laid out for both CTR21 and FCC68 compliant DAA designs. However the components fitted are for the simplified European/FCC68 design. Users wishing to convert to CTR21 should contact CML.

CONTENTS Section 1.1 1.2 Page Features............................................................................................... 1 Brief Description.................................................................................. 1 Preliminary Information...................................................................... 4 1.2.1 Equipment............................................................................... 4 1.2.2 Handling Precautions............................................................. 4 1.2.3 Approvals................................................................................ 4 Quick Start........................................................................................... 5 1.3.1 Setting-Up................................................................................ 5 1.3.2 Operation................................................................................. 5 Signal Lists.......................................................................................... 7 Circuit Schematics and Board Layout................................................ 9 Detailed Description.......................................................................... 11 1.6.1 Hardware Description........................................................... 11 1.6.2 Serial Interface...................................................................... 12 1.6.3 Reset Function...................................................................... 1.6.4 AT Command and S-Register Summary.............................. 14 1.6.5 General Description of AT Commands................................ 17 1.6.6 Modem Result Codes............................................................ 18 1.6.7 Terminal Emulator................................................................ 18 Performance Specification................................................................ 19 1.7.1 Electrical Performance.......................................................... 19


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