EV8680 Datasheet, PDF (5/39 Pages) CML Microcircuits – Evaluation Kit

Evaluation Kit for CMX868
EV8680
1.3 Quick Start
This section provides instructions for users who wish to experiment immediately with the evaluation
kit. A fuller description of the kit and its use appears later in this document.
1.3.1 Setting-Up
THE EV8680 COMES PRE-CONFIGURED WITH A CMX868 DIP DEVICE FOR OPERATION AT 5.0
VOLTS. THE IDC HEADER, J2, HAS ALL 5 JUMPERS INSERTED TO PROVIDE ‘C-BUS’
CONTROL FROM THE ON-BOARD PIC.
An RJ11 (US style) phone jack, J1, is provided for 2-wire line connection. Power is connected via the
two-way socket, J5.
Attach the 9-way RS232 cable between connector J4 and the serial port of the PC. Connect an
external modem/line simulator to the evaluation kit using a suitable RJ11 telephone cable (not
supplied).
1.3.2 Adjustments
The line matching components can be adjusted, as required (refer to CMX868 data sheet and ETAL
transformer recommendations). Telco-specific components may be added, as required.
1.3.3 Operation
The EV8680 Evaluation board allows the user to perform calling, answering and simple data transfer
with a suitable simulator or external third party modem (not supplied). The board also allows the user
to attach laboratory test equipment to perform simple CMX868 device evaluation tests i.e. current
measurement, tone generation and detection.
The board is controlled by the AT command set described in Section 1.6.3, by running a terminal
emulator program on the host PC. A suitable emulator is the ‘Hyper Terminal’ program which
operates under Windows 95/NT systems. The EV8680 AT command set consists of Basic, Extended
and CML Specific commands.
The board has two modes of operation:
AT Command Mode
In this mode the command processor firmware is constantly checking to see if the user has typed a
valid AT command. When a valid command is received the firmware will execute that command.
While the firmware is operating in this mode, the user can instruct it to manually answer a call,
originate a call, go on/off hook, read/write to S-registers, issue CML specific AT commands, and
perform any number of other AT command functions.
The board always starts in AT Command mode after power is applied and board initialisation is
complete.
The CML specific AT commands allow the user to directly control the CMX868 device for evaluation
purposes. Note, customer modified CMX868 device registers will be overwritten when Dial and
Answer AT commands are executed.
© 2000 Consumer Microcircuits Limited
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