cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 3

• Manufacturer Part Number: cx20493-35/app
• Description: With Cx20493 Smartdaa?
• Manufacturer: Conexant Systems, Inc.

Contents
1. Introduction..........................................................................................................................................1-1
2. Technical Specifications .......................................................................................................................2-1
102247B
1.1
1.2
1.3
1.4
1.5
1.6
2.1
2.2
2.3
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
Overview ......................................................................................................................................................................... 1-1
Applications .................................................................................................................................................................... 1-2
Features .......................................................................................................................................................................... 1-4
1.3.1
1.3.2
1.3.3
Technical Overview......................................................................................................................................................... 1-6
1.4.1
1.4.2
1.4.3
1.4.4
Hardware Description ..................................................................................................................................................... 1-9
1.5.1
1.5.2
1.5.3
1.5.4
AT Commands .............................................................................................................................................................. 1-10
Serial DTE Interface Operation........................................................................................................................................ 2-1
2.1.1
Parallel Host Bus Interface Operation............................................................................................................................. 2-2
Establishing Data Modem Connections .......................................................................................................................... 2-2
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9
General Modem Features................................................................................................................................ 1-4
SmartDAA Features ........................................................................................................................................ 1-5
Applications.................................................................................................................................................... 1-5
General Description ........................................................................................................................................ 1-6
MCU Firmware................................................................................................................................................ 1-6
Operating Modes ............................................................................................................................................ 1-6
1.4.3.1
1.4.3.2
1.4.3.3
1.4.3.4
1.4.3.5
Reference Designs.......................................................................................................................................... 1-9
CX81801 Modem Device ................................................................................................................................ 1-9
Digital Isolation Barrier................................................................................................................................. 1-10
CX20493 SmartDAA Line Side Device.......................................................................................................... 1-10
CX20442 Voice Codec .................................................................................................................................. 1-10
Automatic Speed/Format Sensing .................................................................................................................. 2-1
Dialing ............................................................................................................................................................ 2-2
Telephone Number Directory.......................................................................................................................... 2-2
Modem Handshaking Protocol ....................................................................................................................... 2-2
Call Progress Tone Detection ......................................................................................................................... 2-2
Answer Tone Detection................................................................................................................................... 2-2
Ring Detection................................................................................................................................................ 2-2
Billing Protection ............................................................................................................................................ 2-3
Connection Speeds......................................................................................................................................... 2-3
Automode ....................................................................................................................................................... 2-3
Data/Fax Modes.......................................................................................................................... 1-6
V.44 Data Compression.............................................................................................................. 1-7
Worldwide Operation.................................................................................................................. 1-7
TAM Mode.................................................................................................................................. 1-8
Speakerphone Mode (S Models)................................................................................................ 1-9
Conexant
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