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CH2124

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

High Speed Internet Modem Family

SEND EMAIL

CONTROL

Input 1

Input 2

INPUT

SENSE

AND

OUTPUT

PINS

Interface

Circuitry

EMAIL

ACCEPTED

INDICATOR

PIN

RXD

RTS SERIAL

DCD INTERFACE

DSR

V-24

RI EIA-232-E or

CTS UART

TXD

DTR

Network

µP

Protocols

POP 3 SMTP

TCP

IP

PPP

32Kx8

Flash

ROM

CH21XX

V.90 MODEM

MODEM INTERFACE

DAA

TIP

PSTN

Ring

RST SPK +5V

GND

Figure 2. Functional Block Diagram of Cermetek CH21XX iModem Products.

When not utilized in the internet connectivity role, the

iModem will function as a standard analog modem.

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

CH2156/60 contains a V.90 internal modem while the

CH2124 contains a V.22 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 CH2156/60

(CH2124) iModem and the host processor is

conducted over the RS232 serial interface at

57.6kbps (2400bps).

CH2156/60 DTE Speed. AS DELIVERED FROM THE

FACTORY, the CH2156/60 iModem will only

communicate with the DTE at 57.6kbps and the

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. When the user changes the

DTE communication speed to any speed other than

57.6kbps, 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.

2003 Cermetek Microelectronics, Inc.

Page 5

Document No. 607-0017 Revision G1 (06/03)

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