EV8680

Evaluation Kit

User Manual

© 2000 Consumer Microcircuits Limited

UM8680/2 November 2000

Advance Information

1.0

Features

•• CMX868 Product Evaluation

•• PC Controlled via Terminal Emulator

•• Fully Isolated 2-Wire Line Interface

•• DIP or SOIC Product Evaluation

•• Modem Calling/Answering Demonstrations

•• User’s Prototyping Area

•• ‘AT’ Command Compatible Firmware

•• On-Board PIC Programming

•• Opto Isolated Ring Detect Circuitry and

OptoMOS Hook Relay

•• Socketed Space for Optional Telco-

Specific Components

•• Single Power Supply Operation with On-

Board Regulator

•• Socketed Components and Links for

Circuit Adjustment

1.1

Brief Description

The EV8680 Evaluation Kit comprises a single board containing a CMX868 V.22 bis Modem IC, line interface

components and a PIC

µC with serial communications port for interfacing to a PC. AT Commands are used to

control the evaluation board via standard terminal emulators.

The board is powered from a single 8 - 14V dc power supply; an on-board regulator and two discrete

status. The CMX868 may be driven from an external clock, or from the on-board crystal oscillator.

Removal of jumpers allows the user to measure device current and also to disconnect the ‘C-BUS’ control

lines from the on-board

µC to allow control from an external system. Important signals can be monitored via

test points and header pins.

The evaluation board has a 2-wire line interface to provide line matching and dc isolation. This 2-wire interface

is connected to the line using an OptoMOS relay.

The CMX868 and

µC are fitted in DIL sockets for easy replacement. Where components are telco-specific

(line impedance, line protection, etc.) space is provided for the user to add appropriate components.