Datasheet > DE8681

DE8681

更新时间： 2024-10-31 22:24:03

品牌	Logo	应用领域
CMLMICRO		调制解调器插座
页数	文件大小	规格书
35页	445K
描述
V.22bis User Manual for a socket modem

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DE8681 数据手册

DE8681

V.22bis User Manual

for a "socket modem"

CMLMicrocircuits

COMMUNICATION SEMICONDUCTORS

UM8681/3 January 2004

Provisional Issue

1.0

Features

· CMX868-based socket modem Reference Design · PC Controlled via Terminal Emulator

· Fully Isolated 2-Wire Line Interface

· FCC68 or CTR21 DAA

· Opto Isolated Ring Detect Circuitry and

· Single 3V or 5V dc power supply

OptoMOS Hook Relay

operation

· ‘AT’ Command Compatible Firmware

· On-board FLASH PIC Microcontroller

· Break-off PCB sections

· Supplied with PCB layout data

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 mC.

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 for users who wish to fit

the CTR21 components. Hardware has been provided on the socket modem section for CLI Type 1, but

a PIC firmware upgrade will be required to enable this function, which may be available at a later date.

With this is mind, the socket modem has been provided with a Flash PIC Microcontroller that can be

serially programmed in circuit via the RS232 connection.

ã 2004 CML Microsystems Plc

UM/8681/3

12 3 4 5 6 7...35

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