EV8680 datasheet(14/39 Pages) CMLMICRO

14 / 39 page

Evaluation Kit for CMX868

EV8680

UM8680/2

1.6.1.6 Line Protection

Line protection is provided by R2 (47

Ω), R3 (47Ω), and D1 (Phillips BR211 series 140V). These

components are not fitted, but suitable values for UK applications are suggested in brackets. Wire

links which bypass R2 and R3 will need to be removed if these resistors are fitted.

1.6.2

Adjustments and Controls

Various line interface components around the evaluation devices are socketed to allow for user

adjustments. Discrete component sockets are also provided for Telco-specific components.

1.6.3

Firmware Description

The PIC16LC76-04/SP (OTP) µC fitted on the EV8680 evaluation kit has been programmed by CML

before shipment with the latest version of firmware.

Please read the separate information sheet

(EK8680) and check the CML web site for firmware status. The latest source code and programming

file (EF8680xx.HEX, where xx represents the version number) can be downloaded from the CML web

site.

The serial communications firmware supplied in the PIC µC assumes the following configuration; 8

data bits, no parity, 1 stop bit and 19,200 baud with hardware flow control.

The firmware routine run at start-up and reset performs the following important tasks:

Peripheral Interrupt Initialisation

µC ports and I/O direction initialisation

Serial Communication Interface (SCI) initialisation

Serial Peripheral Interface (SPI) initialisation

Loads factory profile 0

Resets CMX868 evaluation device.

The message EF8680 Vx.x, will be displayed in the terminal emulator window when these tasks have

been completed.

The EV8680 evaluation board will send an error message (‘Invalid CMX868 Rev’) to the PC if an old

CMX868 device revision is detected. The latest EV8680 firmware is only designed to work with the

latest CMX868 device.

Note, the CMX868 device is always reset and powered up at the beginning of the negotiation or BERT

routines.

The firmware only supports DTMF dialling.

AT command echoing is an option available in the firmware and involves echoing the received

characters sent by the PC. The firmware also provides the option of sending result codes to the PC.

These responses can be in either an alpha or numeric form.

The AT command set for the EV8680 Evaluation kit is tabulated below. These commands can be

entered on a PC running Windows terminal emulator software, such as the ‘Hyper Terminal’ program

supplied with Windows 95/NT systems.

EV8680 Datasheet(PDF) 14 Page - CML Microcircuits

EV8680 Datasheet(HTML) 14 Page - CML Microcircuits

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