Product Brief Rev 1.0

April 2005

OCM-22

One-Chip Modem for Embedded Applications

Features

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Controller and data pump in a single 48-pin TQFP

with two integrated peripheral interfaces:

— Partial ISA (8-bit parallel).

— RS232.

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Data mode capabilities range:

— V.22bis: 2400 bits/s.

— V.22: 1200 bits/s.

— V.23: 1200/600 bits/s.

— V.21: 300 bits/s.

— Bell 212A: 1200 bits/s.

— Bell 103: 300 bits/s.

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Serial DTE interface:

— Hardware and software flow control.

— Asynchronous data format: 19,200 bits/s, 8-bit

data, no parity, 1 stop bit.

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Parallel DTE interface for connection to system I/O

or memory bus.

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DAA support:

— CSP1035A silicon DAA.

— CSP1034C with transformer DAA.

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Supports low-cost, call-progress speaker.

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Support for country-specific settings

(homologation) under host control.

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Supports extension phone detection for set-top

box applications when used with CSP1035A DAA.

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Customized feature set using code downloads into

on-chip RAM.

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Internal PLL to generate high-speed clocks from

external low-cost crystal.

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Single 3.3 V supply.

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Type 1 caller ID support (US, UK, France, Ger-

many, and Spain).

Introduction

OCM-22 is a low-cost modem solution for low-speed

embedded applications. OCM22 includes a simplified

AT command set and supports data rates from

300 bits/s (V.21) to 2400 bits/s (V.22bis) and only

requires a CSP1034 or CSP1035A to make a com-

plete modem.

OCM-22 provides a choice of two system interfaces,

a serial interface or an 8-bit parallel interface. The

serial interface can be used in systems that have an

available serial port. In other systems, the parallel

interface can be I/O or memory mapped onto typical

processor buses.

In typical applications, OCM-22 is paired with Agere's

CSP1035A silicon DAA to implement a low-cost

worldwide modem. OCM-22 can also be used with

Agere's CSP1034 line codec for traditional trans-

former-based DAA designs.

Applications

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Set-top-box

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Verification machines

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Point of sale

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Franking machines

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Other low-speed data