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CH2100

Super Small 2400bps Modem Module

Cermetek Microelectronics 

Cermetek

microelectronics

CH2100 Super Small 2400bps

Modem Module

INTRODUCTION

The CH2100 is a full function, fully approved V.22bis 2400bps

modem module. It is hermetically encapsulated and has a

footprint that is less than one square inch. This makes the

CH2100 unique in size, performance and reliability. The CH2100

interfaces directly to the telephone line utilizing its built in PSTN

line interface. The modem is completely intelligent and is

controlled by and will communicate via the five volt serial transmit

and receive data pins exclusively. The CH2100 uses the

standard AT commands and status words for command and

control. No additional external pin connections are required.

Even though all other vestigial modem signals have been

eliminated, the CH2100 can communicate with any other

commercially available modem up to and including 56Kbps

modems. The CH2100 supports asynchronous operation at

2400bps, 1200bps, and 300bps to CCITT and Bell standards.

Through-hole or surface mount pins are available. The user

may select from standard temperature range or extended

temperature range versions. The CH2100 is FCC part 68

approved (which is conveyed to the user), is UL1950 and CSA

C22.2 950 compliant and is approvable in Canada to CSA CS-

03 Part I.

GENERAL DESCRIPTION

The CH2100 has very few external pins (when compared to

conventional modems) making the CH2100 extremely easy to

interface to the user’s application hardware. Unique to the

CH2100 archeitecture is the assumption that an intelligent host

is processing the transmit and receive data, providing the AT

commands for control and interpretting the status information

supplied by the CH2100. Pins such as DCD, DSR, RST, CTS,

HS - which are commonly found on conventional modems - are

functionally duplicated with the AT command structure and have

been eliminated. This minimizes the external hardware interface

to the CH2100 while simultaneously consolidating control of the

modem into one place: the user or host controller. All

communication to the CH2100 is conveyed on the TXD (or

transmit) pin with respect to ground. All communication from the

CH2100 is received by the host controller on the RXD (or receive)

pin with respect to ground. For those users that require access

to the traditional pin set or who do not have an intelligent host

controller available for the CH2100, Cermetek recommends use

of one of our many conventional modems which offer a broad

range of externally controlled functions that collectively provide

solutions for virtually every modem application. Please access

the Cermetek web site at www.cermetek.com for other data

sheets.

FEATURES

• Supports Standards CCITT V.22bis, V.22, Bell 212, and

Bell 103

• FCC Part 68 approved and CSA CS-03 Part I approvable

• AT Command structure - with extensions

• 1500VAC RMS isolation barrier, 2122V peak surge protection

• Single 5 volt operation

Figure 1. Functional Block Diagram of CH2100.

• Low power operation with automatic reduced power

standby mode

• Automatic adaptive and fixed compromise equalization

• Test modes and diagnostics

• Size: 0.86”x1.10”x0.53” (nominal)

• Fully encapsulated

• UL1950 and CS22.2 950 compliant approval pending

• Extended Temperature: -40oC to 85oC

DESCRIPTION OF FUNCTIONAL BLOCKS AND

DISCUSSION OF BASIC OPERATIONS

Figure 1 contains a functional block drawing of the CH2100. The

CH2100 is a highly integrated, full-function modem, comprised of

a modulator/demodulator, controller, and an FCC Part 68 approved

PSTN line interface DAA (Data Access Arrangement).

Modulation/Demodulation and Modem Controller.

These functions are provided by a monolithic modem integrated

circuit. This IC has built-in facilities to accommodate integrated AT

command control and contains the necessary resident interfaces

for general communication and routing to the DAA.

Telephone Interface or DAA.

The CH2100 is designed to meet North American telephone

standards as set by FCC Part 68 (USA) and CSA CS-03 Part I

(CANADA). Among the more critical parameters, the telephone

line interface is designed to meet 1500VAC RMS and 2122 volts

peak surge isolation. Consequently, the CH2100 satisfies U.S.

and Canadian requirements, and will meet other international approval

agency requirements that specify this level of isolation.

CH2100 comes with FCC Part 68 approval and is shipped from the

factory with an FCC Part 68 label indicating the registration number

and ringer equivalent. This label should be prominently displayed

on the end product.

1999 Cermetek Microelectronics, Inc.

Document No. 607-2100 Rev.C (8/99) 1

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