CH2156 View Datasheet(PDF) - Cermetek Microelectronics

Part Name

Description

View to exact match

CH2156

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

(Pin #6) will cause the iModem® to send an email using its internal Each iModem® product consists of a mP controller with Network

default internet configuration profile. This profile is pre-programmed Protocols and Flash ROM, Extended RAM (CH2158/9 or CH2160

at the factory and can be modified by the user. No host processor only), serial interface buffer, modulator/demodulator, modem

intervention is required. The RS232 DTE serial interface is not controller with error correction and data compression, nonvolatile

required for fully autonomous on demand and event driven control. RAM and DAA.

Semi-Autonomous Control.

The iModem® performs the following functions automatically:

This method requires a minimal amount of host processor

intervention and by necessity requires that the RS232 DTE serial

interface be operational.

Semiautonomous control is a special case of full Host Supervised

Control and relies on the pre-programmed default internet configu-

ration profile contained within the iModem®. Initiation of the email

activity occurs with the issuance of either the @TD iNet AT®

Command (to Deliver email) or the @TG command (to receive

email) by the host processor to the iModem®. PSTN dial-up, logon

& authentication and email transmission are performed automati-

cally by the iModem® in the same fashion as the on Demand

1. Connects to ISP.

2. Authenticates user ID and logs onto internet.

3. Sends (or Receives) email to address specified using ISPs

SMTP or POP3 Mail Server.

4. Terminates ISP session after all data is sent (or received).

5. Sends message accepted Pulse to Pin 4 after all the ISP Mail

Server accepts the email.

Control of the internet capabilities of the iModem® can be either

event driven, semiautonomous, or initiated and controlled by a

system level host processor.

control method described above.

Further, the iModem® can function as a 56K V.90 modem when

Host Supervised Control.

not connected to the internet.

This method is the most flexible, but requires the issuance of each

of the necessary iNet® AT Commands in the required order from

the host processor.

mP Controller.

The mP controller is a Motorola GP32 type controller with resident

internet protocol software and flash ROM. This controller

Although the RS232 DTE serial interface is required to be opera-

tional for this method of control, an additional feature of this

method is the ability of the host to override the pre-programmed

ISP and/or email address by simply including the applicable

interprets the iNet AT® commands issued by the external host

processor or executes internal iNet AT® Command strings

depending on the iModem® control method employed by the

user.

information on the same line of code as the iNet AT® Command.

Extended RAM.

Host supervised control is recommended for debug activities.

Regardless of the method of iModem® control employed, the

iModem® will abort all email related activities if a low going TTL

pulse is presented to the Send Email Control Pin (PIN #6) at any

time during or after initiation of email send (@TD command) or

email Receive (@TG Command).

Additional RAM is used as cache memory for the purpose of

email flow control and to facilitate transmission and reception of

large email files.

Modem Control.

The internal modem can be controlled with industry standard AT

commands and is compatible with available industry communica-

tion software.

DESCRIPTION OF FUNCTIONAL BLOCKS AND DISCUS-

SION OF BASIC OPERATIONS

Figure 1 contains a functional block drawing of the iModem®.

Serial Host Interface Buffer.

The iModem® utilizes a serial V.24 EIA 232-E 5V interface to

control the modem and communicate with the mP.

Figure 1. Functional Block Diagram of iModem®

© 2000 Cermetek Microelectronics, Inc.

Page 2

Document No. 607-0017 Rev. B (06/00)

Share Link: