CH2165 Просмотр технического описания (PDF) - Cermetek Microelectronics

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CH2165

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

5. The CH2124/60 sends an ASCII MESSAGE

ACCEPTED activity response message and sends

a TTL LOW Pulse to Pin 8 indicating that the ISP

Mail Server has accepted the email message.

Control of the internet capabilities of the iModem can be

either event driven or initiated and controlled by a

system level host processor. Refer to Table 3 for a

complete set of pin descriptions.

When not utilized in the internet connectivity role, the

iModem will function as a standard analog modem.

KEY FEATURE

The user has complete control of the level of

autonomy the iModem exercises in the user’s

application. This is a unique feature of Cermetek’s

iModem products.

µP Controller. The µP controller performs the required

internet operations by interpreting each specific @T®

command and executing the appropriate internet

commands. The necessary internet protocol firmware

is resident in flash ROM. The @T® commands function

as an extension to the industry standard Hayes AT

command set.

Internal Modem. The internal modem is used to

establish a data connection with the ISP. The

CH2160/65 contains a V.90 internal modem while the

CH2124 contains a V.22bis internal modem. The

internal modem can be controlled with Hayes AT

commands and is compatible with industry standard

communication software. Refer to Cermetek

publication, AT Commands and S-Registers, for a more

detailed discussion of the Hayes AT commands

supported by the iModem product family.

When operating in standard analog modem mode, the

maximum Data Terminal Equipment (DTE)/Host system

communication speed is established by the maximum

speed available from the DTE/Host and is not limited by

the iModem product.

IMPORTANT NOTICE

AS DELIVERED FROM THE FACTORY, all @T®

command communication between the CH2160/65

(CH2124) iModem and the host processor is

conducted over the serial interface at 57.6/19.2kbps

(2400bps).

CH21XX DTE Speed. AS DELIVERED FROM THE

FACTORY, the CH2160/65 iModem will only

communicate with the DTE at 57.6/19.2 kbps and the

High Speed Internet Modem Family

CH2124 at 2400bps. However, the user may modify

the DTE speed with the appropriate @T® commands.

Refer to Application Note # 155, @T® Command Set

Description and Usage For CH2124/60 or to Application

Note # 325, @T® Command Set Description and Usage

For CH2165. When the user changes the DTE

communication speed to any speed other than the

default value set of the factory, the user must ensure

that the DTE supports the speed selected. Failure to

do so could adversely affect communication with the

iModem device or, worst-case, disable communication

with the internal µP controller. Refer to Application

Note # 158, Cermetek iModem Caveats and Definitions,

for a more detailed discussion of this issue.

Refer to Cermetek’s High Speed Modem and FAX

Family product data sheet for a complete Description of

the internal modem’s capabilities and functions.

Serial Host Interface Buffer. The iModem utilizes a

serial V.24 EIA 232-E 5V interface to communicate with

the internal modem and to communicate with the

internal µP.

Telephone Line Interface or DAA. The iModem

family includes a unique low distortion DAA designed

for optimal performance over all PSTN line conditions

thereby achieving the most reliable and best

performance PSTN connections.

The CH21XX iModem family is designed to meet North

American telephone standards as set by FCC Part 68

IMPORTANT NOTICE

If the user wants to change the DTE/Host

communication speed to any speed other than the

factory set speed of 57.6/19.2kbps for the CH2160/65

or 2400bps for the CH2124, the user must first

change the DTE speed of the iModem using the

appropriate all @T® commands before changing the

DTE/Host speed. Refer to Application Note # 158,

Cermetek iModem Caveats and Definitions, for a

more detailed discussion of this issue.

(USA) and CSA CS-03 Part I (Canada). Each iModem

product is shipped from the factory with an FCC label

indicating the FCC registration number and ringer

equivalent. The PSTN line interface is UL1950 and

CSA listed. Consequently, the iModem family of

products satisfies U.S. and Canadian requirements,

and will meet other international approval agency

requirements that specify these levels of isolation.

2003 Cermetek Microelectronics, Inc.

Page 6

Document No. 607-0017 Revision H2 (11/03)

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