CH2124 데이터 시트보기 (PDF) - Cermetek Microelectronics

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CH2124

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

demand event triggered email transmission (CH2124)

to full send and retrieve email (CH2160) capability.

User Control of the Internet communication activity of

the iModem device typically falls into one of the

following basic control strategies:

1. Fully Autonomous or event driven control requiring

no host processor intervention.

2. Semiautonomous control, requiring one command

to be issued from the host processor.

3. Complete host intervention and supervision

requiring each command to be issued from the

host.

Fully Autonomous On Demand Event Driven

Control. This is the simplest method of operational

control. Application of a 50ms TTL Low going pulse

(i.e., V<0.6V) to the Send Email Control pin (Pin # 6)

will cause the iModem to send an email using its

internal default internet configuration profile. This

profile is pre-programmed at the factory and can be

modified by the user as necessary. No host processor

intervention is required. The RS232 DTE serial

interface is not required for fully autonomous on

demand or event driven control.

Semi-Autonomous Control. This method requires a

minimal amount of host processor intervention and

requires that the RS232 DTE serial interface be

operational.

Semi-autonomous control is a special case of full Host

Supervised Control and relies on the preprogrammed

default internet configuration profile contained within

the iModem. Initiation of the email activity occurs with

the issuance of either the @TDMn Command (to

deliver email), the @TDGn Command (to retrieve

email) or the @TDKn Command (to delete email) by

the host processor to the iModem. PSTN dial-up,

logon, authentication and email transmission/retrieval

are performed automatically by the iModem in the

same fashion as for the Fully Autonomous On-

Demand control method described above.

Host Supervised Control. This method is the most

flexible, but requires issuance by the host processor of

the necessary @T® commands in the required order

from the host processor. When choosing an

implementation scheme utilizing a host processor, the

host controls the iModem by using Cermetek @T®

commands. These commands are extensions of the

standard Hayes AT command set.

Although the RS232 DTE serial interface is required to

be operational for this method of control, an additional

feature of this method is the ability of the host to over-

ride the preprogrammed parameters (including the

email message content) by simply entering the

High Speed Internet Modem Family

applicable information using the appropriate @T®

Command.

Host supervised control is recommended for debug

activities.

Regardless of the method of iModem control

employed, the iModem will abort email related

activities and return to the idle state 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, @TDMn Command), retrieve email (@TDGn

command) or delete email (@TDKn Command).

DESCRIPTION OF FUNCTIONAL BLOCKS

AND DISCUSSION OF BASIC OPERATIONS

Each iModem product consists of the following

functional blocks:

1. µP controller with Network Protocols and Flash

ROM.

2. Serial interface buffer.

3. Input/Output interface circuitry.

4. V.90 internal modem.

5. Modem interface circuitry.

6. DAA (Data Access Arrangement) PSTN interface.

Figure 2 contains a schematic drawing illustrating the

interconnectivity of the various functional blocks

comprising the CH21XX iModem products.

Each iModem performs the following internet

connectivity functions automatically:

1. Dials local POP and Connects to ISP.

2. Authenticates user ID and logs onto the internet.

3. Sends (or Retrieves) email to (from) the address

specified using the ISP’s SMTP (POP3) Mail

Server.

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

retrieved).

5. 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 2 for a

complete set of pin descriptions.

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.

2003 Cermetek Microelectronics, Inc.

Page 3

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

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