器件名称: DE8681
功能描述: V.22bis User Manual for a socket modem
文件大小: 445.36KB 共35页
简 介:DE8681
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
UM8681/3 January 2004
V.22bis User Manual for a "socket modem"
Provisional Issue
1.0
Features
PC Controlled via Terminal Emulator FCC68 or CTR21 DAA Single 3V or 5V dc power supply operation Break-off PCB sections Supplied with PCB layout data
CMX868-based socket modem Reference Design Fully Isolated 2-Wire Line Interface Opto Isolated Ring Detect Circuitry and OptoMOS Hook Relay ‘AT’ Command Compatible Firmware On-board FLASH PIC Microcontroller
1.1
Brief Description
The DE8681 Demonstration Board is a reference design for the CMX868 V.22 bis modem IC. On the main "socket modem" section it also contains the line interface components and a Flash PIC C. Attached to the main section are two break-off sections which contain a 9-pin D type socket for PC serial communications, a Flash PIC programming connector, an RJ11 line connector and various LEDs for indicating signal activity. AT Commands are used to control the demonstration board via a standard terminal emulator program running on a host PC. 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 at 3V 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 FCC68 design. Instructions are given fo……