EV8680
Evaluation Kit
User Manual
UM8680/2 November 2000
Advance Information
1.0
Features
•
PC Controlled via Terminal Emulator
•
DIP or SOIC Product Evaluation
•
User’s Prototyping Area
•
On-Board PIC Programming
•
Socketed Space for Optional Telco-
Specific Components
•
Socketed Components and Links for
Circuit Adjustment
•
CMX868 Product Evaluation
•
Fully Isolated 2-Wire Line Interface
•
Modem Calling/Answering Demonstrations
•
‘AT’ Command Compatible Firmware
•
Opto Isolated Ring Detect Circuitry and
OptoMOS Hook Relay
•
Single Power Supply Operation with On-
Board Regulator
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
µ
C 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
components set V
DD
to provide 2.7 Volt or 5.0 Volt operation. LEDs indicate carrier detect and hook relay
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
µ
C 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
µ
C 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.
©
2000
Consumer Microcircuits Limited
CMLMICRO [ CML MICROCIRCUITS ]
