CX93011-2x CSMxx
V.92/V.34/V.32bis Controller Serial
Modem with CX20548 SmartDAA®
Data Sheet
DSH-201689G
July 2012
2© 2012 Conexant Systems, Inc. DSH-201689G
7/17/12
© 2009, 2011, 2012, Conexant Systems, Inc.
All Rights Reserved.
Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are provided by
Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no responsibility for errors or
omissions in these materials. Conexant may make changes to this document at any time, without notice. Conexant advises all customers to
ensure that they have the latest version of this document and to verify, before placing orders, that information being relied on is current and
complete. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or
incompatibilities arising from future changes to its specifications and product descriptions.
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THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE
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Revision History
Revision Date Description
A June 11, 2008 Initial release
B July 29, 2008 Revision B release
C July 31, 2008 Revision C release
D June 26, 2009 Revision D release
*Updated Table 1, CSMxx Models and
Functions
E January 20, 2011 Revision E release
*Updated Table 12, CX93011-2x Modem
Operating Conditions
F May 18, 2012 Revision F release
*Updated package dimension tables for 16-pin
QFN punch and sawn styles and 20-QFN
punch and sawn styles.
G July 17, 2012 Revision G release
*Updated Reset description in Table 5.
*Updated Figure 2 Reset section with 20 kΩ
pull-down resistor.
*Updated Table 14.
DSH-201689G © 2012 Conexant Systems, Inc. 3
7/17/12
Contents
Figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.2.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.3 Technical Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.2 Embedded MCU Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.3 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.3.1 Data/Fax Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.3.2 V.44 Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.3.3.3 Synchronous Access Mode (SAM) - Video Conferencing . . . . . . . . . . . . . . 16
1.3.3.4 TAM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.3.3.5 Worldwide Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.3.4 Reference Designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.4 Hardware Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.4.1 CX93011-2x Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.4.2 Digital Isolation Barrier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.4.3 CX20548 SmartDAA Line Side Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.5 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.5.1 Data Modem Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2 Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.1 Serial DTE Interface Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.1.1 Automatic Speed/Format Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.1.1.1 Command Mode and Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.2 Establishing Data Modem Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.1 Dialing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.1.1 DTMF Dialing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.1.2 Pulse Dialing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.1.3 Blind Dialing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.2 Modem Handshaking Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.3 Call Progress Tone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.4 Answer Tone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CX93011-2x CSMxx Data Sheet
4© 2012 Conexant Systems, Inc. DSH-201689G
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2.2.5 Ring Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.6 Billing Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2.7 Connection Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.2.8 Automode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.3 Data Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.1 Speed Buffering (Normal Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.2 Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.3 Escape Sequence Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.4 BREAK Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.5 Telephone Line Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.5.1 GSTN Cleardown (V.92, V.90, V.34, V.32bis, V.32). . . . . . . . . . . . . . . . . . . . 26
2.3.5.2 Loss of Carrier (V.22bis and Below). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.3.6 Fall Forward/Fallback (V.92/V.90/V.34/V.32bis/V.32) . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.7 Retrain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.8 Programmable Inactivity Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.9 DTE Signal Monitoring (Serial DTE Interface Only). . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.9.1 DTR# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.9.2 RTS# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.10 Call Progress Speaker Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.11 Serial EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.4 V.92 Features (V.92 Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.4.1 Modem-on-Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.4.2 Quick Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.4.3 PCM Upstream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5 Error Correction and Data Compression. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.1 V.42 Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.2 MNP 2-4 Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.3 V.44 Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.4 V.42bis Data Compression. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.5 MNP 5 Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.6 Voice/Audio Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.1 Online Voice Command Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.2 Voice Receive Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.3 Voice Transmit Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.4 Full-Duplex Receive and Transmit Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.5 Audio Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.6 Tone Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.7 V.80 Synchronous Access Mode (SAM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.8 Telephony Extensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.8.1 Line-in-Use Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.8.2 Extension Pick-up Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.8.3 Remote Hang-up Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.9 Point-of-Sales Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.10 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.11 Tone Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.12 Call Waiting Tone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.13 Caller ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
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CX93011-2x CSMxx Data Sheet
2.14 Worldwide Country Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.15 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.15.1 Analog Loopback (&T1 Command).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.15.2 Analog Loopback (&T1 Command).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.16 Low Power Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.16.1 Idle Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.16.2 Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.16.3 Deep Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.16.4 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3 Hardware Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1 CX93011-2x Modem Hardware Interface Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.1 CX93011-2x Modem Interface Signal Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.1.1 LSD Interface (Through DIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.1.2 Call Progress Speaker Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.1.3 Clock Select Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.1.4 Serial EEPROM Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.1.5 Serial DTE Interface and Indicator Outputs . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.2 CX93011-2x Modem Pin Assignments and Signal Definitions. . . . . . . . . . . . . . . . . . 36
3.1.3 CX93011-2x Modem Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.2 CX20548 LSD Hardware Pins and Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.1.1 Host Side Device (HSD) Interface (Through DIB) . . . . . . . . . . . . . . . . . . . . 41
3.2.1.2 Power and Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.1.3 Telephone Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.1.4 Voltage References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.1.5 General Purpose Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.2 Pin Assignments and Signal Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.3 Operating Conditions, Absolute Maximum Ratings, and Power Requirements . . . . . . . . . . 47
3.3.1 Handling CMOS Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.4 Crystal and Clock Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4 Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5 Recommended QFN Surface Mount Land Patterns . . . . . . . . . . . . . . . . . . . . . . 57
CX93011-2x CSMxx Data Sheet
6© 2012 Conexant Systems, Inc. DSH-201689G
7/17/12
DSH-201689G © 2012 Conexant Systems, Inc. 7
7/17/12
Figures
Figure 1. CSMxx Modem Simplified Interface Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 2. CX93011-2x Modem Hardware Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 3. CX93011-2x Modem 20-Pin QFN Pin Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 4. CX20548 LSD Hardware Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 5. CX20548 LSD 16-Pin QFN Pin Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 6. Package Dimensions for 20-Pin QFN, Punch Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 7. Package Dimensions for 20-Pin QFN, Sawn Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 8. Package Dimensions for 16-Pin QFN, Punch Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 9. Package Dimensions for 16-Pin QFN, Sawn Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 10. Recommended Surface Mount Land Pattern for 20-Pin QFN . . . . . . . . . . . . . . . . . . . . 57
Figure 11. Recommended Surface Mount Land Pattern for 16-Pin QFN . . . . . . . . . . . . . . . . . . . . . 58
CX93011-2x CSMxx Data Sheet
8© 2012 Conexant Systems, Inc. DSH-201689G
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DSH-201689G © 2012 Conexant Systems, Inc. 9
7/17/12
Tables
Table 1. CSMxx Models and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 2. Default Countries Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 3. +MS Command Automode Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 4. CX93011-2x Modem 20-Pin QFN Pin Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 5. CX93011-2x Modem 20-Pin QFN Pin Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 6. CX93011-2x Modem I/O Type Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 7. CX93011-2x Modem DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 8. CX20548 LSD 16-Pin QFN Pin Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 9. CX20548 LSD Hardware Signal Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 10. CX20548 LSD GPIO DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 11. CX20548 LSD AVDD and DVDD DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . 46
Table 12. CX93011-2x Modem Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 13. Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 14. CX93011-2x Current and Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 15. Crystal Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 16. Clock Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 17. Package Dimensions for 20-Pin Punch and Sawn Styles . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 18. Package Dimensions for 16-Pin Punch and Sawn Styles . . . . . . . . . . . . . . . . . . . . . . . . 54
Tables CX93011-2x CSMxx Data Sheet
10 © 2012 Conexant Systems, Inc. DSH-201689G
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1Introduction
1.1 Overview
The Conexant® CSMxx V.92 Modem supports V.92 analog data modem operation and
14.4 kbps fax modem operation. In addition, the modem supports remote telephone
answering machine (TAM). The modem also supports V.44/V.42bis/MNP 5 data
compression for greater data throughput and V.42 LAPM/MNP2-4 error correction
protocol for increased data integrity and reliability. Table 1 lists the ordering
information.
The CSMxx device set consists of a CX93011-2x V.92/V.34/V.32bis Modem device in a
20-pin QFN and a CX20548 SmartDAA® 4 Line Side Device (LSD) in a 16-pin QPN.
The CX93011-2x has a serial interface.
The CX93011-2x modem device integrates a microcontroller (MCU), a digital signal
processor (DSP), internal RAM, internal ROM, and a SmartDAA system side device
(SSD) onto a 20-pin QFN.Figure 1 illustrates the top-level modem interface
connection.
Conexant’s SmartDAA technology used in the SmartDAA 4 LSD eliminates the need
for bulky analog transformers, relays, and opto-isolators typically used in discrete DAA
implementations. The SmartDAA 4 LSD operates without drawing power from the
phone line, unlike line-powered DAAs, and is therefore not subject to variations in line
voltage conditions. The SmartDAA 4 LSD also adds enhanced telephony extension
features to the modem’s operation and other functions such as Call Waiting detection,
and Caller ID decoding. Incorporating Conexant’s proprietary Digital Isolation Barrier
(DIB) design and other innovative DAA features, the SmartDAA architecture simplifies
application design and minimizes layout area to reduce design cost.
In TAM mode, enhanced 2-bit or 4-bit per sample coding schemes at 8 kHz sample
rate provide flexible format compatibility and allows efficient digital storage of voice/
audio. Also supported are 8-bit A-law, µ-law, and linear coding and IMA 4-bit ADPCM
coding. This mode supports applications such as digital telephone answering
machine, voice annotation, and recording from and playback to the telephone line.
The modem operates by executing masked code from internal ROM. The modem
features internal RAM memory that enhances the modem's flexibility. The modem's
internal RAM can be used to load new country profiles, override existing country
profiles or add customized firmware code. An optional external serial NVRAM is
supported. The optional external NVRAM adds the convenience of permanent
storage, just like internal RAM, NVRAM can be used to store new country profiles,
override existing ones or add customized firmware code.
Small, low-profile packages, reduced voltage operation, and low power consumption
make this device set an ideal solution for embedded applications.
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Introduction CX93011-2x CSMxx Data Sheet
Figure 1. CSMxx Modem Simplified Interface Diagram
Table 1. CSMxx Models and Functions
Model/Order/Part Numbers Supported Functions
Marketing
Name
Device Set
Order Number
Modem Device
(20-Pin QFN)
Part Number
Line Side Device (LSD)
(16-Pin QFN)
Part Number
V.92/V90
Data V.34 Data
V.32bis Data,
V.17 Fax,
TAM,
Worldwide
CSM92 DS92-CSM-21Z CX93011-21Z CX20548-11Z (Note 3) Y Y Y
CSM34 DS34-CSM-22Z CX93011-22Z CX20548-11Z (Note 3) — Y Y
CSM32bis DS32-CSM-23Z CX93011-23Z CX20548-11Z (Note 3) — — Y
GENERAL NOTES:
1. Supported functions (Y = Supported; N = Not supported).
2. All devices are lead-free (Pb-free) and RoHS-compliant. These devices are compatible with leaded reflow processes.
3. Device is marked 20548-A.
CX93011-2x Modem
20-Pin QFN
MCU/DSP
SmartDAA
Interface
DTE/Host
Interface
RAM
ROM
28.224 MHz
or
27.000 MHz
Crystal or Clock
Source
Digital Isolation
Barrier (DIB)
Optional
NVRAM
CX20548
SmartDAA 4
Line Side Device (LSD)
16-Pin QFN
Line Side
DIB
Interface
(LSDI)
Codec
Telephone
Line
Interface
External
Discrete
Components
DAA Hardware
Telephone
Line
TIP
RING
Serial
Interface
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CX93011-2x CSMxx Data Sheet Introduction
1.2 Features
Modulations and protocols
– ITU-T V.92 (V.92 model)
Modem-on-Hold (MOH)
Quick connect (QC)
PCM upstream
– V.90 (V.92 model)
– V.34 (V.92 and V.34 models)
– V.32bis, V.32, V.22bis, V.22, V.23, V.21
– V.23 reverse, V.23 half-duplex
– Bell 212A/Bell 103
– V.29 FastPOS
– V.22bis fast connect
– V.80 Synchronous Access Mode
Data compression and error correction
– V.44 data compression (V.92 model)
– V.42bis and MNP 5 data compression
– V.42 LAPM and MNP 2-4 error correction
Fax modem send and receive rates up to 14.4 kbps
– V.17, V.29, V.27 ter, and V.21 channel 2
– EIA/TIA 578 Class 1, T.31 Class 1.0, and Class 2
Call Waiting (CW) detection and Type II Caller ID decoding during data mode
Type I Caller ID (CID) decoding
Telephony/TAM
– V.253 commands
– 2-bit and 4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit linear PCM, and 8-
bit µ-law and A-law PCM coding
– 8 kHz sample rate - Concurrent DTMF, ring, and Caller ID detection
DTE/host interface
– Serial DTE interface
– Direct Mode
– Asynchronous Mode
No external memory required
Sixty-three embedded and upgradeable country profiles
Serial NVRAM interface for optional permanent country profile storage
Embedded AT commands
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Introduction CX93011-2x CSMxx Data Sheet
SmartDAA
– Extension pick-up detection
– Digital line protection
– Line reversal detection
– Line-in-use detection
– Remote hang-up detection
– Worldwide compliance
Selectable 28.224 MHz or 27.000 MHz frequency of operation
Low power and voltage
– Single +3.3V supply
– Low power consumption mode
– +3.3V I/O level
Compact, robust board design
– Small, low-profile modem packages
– SmartDAA and DIB technologies
– Reference design supports 5 kV isolation
Small packages
– CX93011-2x Modem: 20-pin QFN
– CX20548 LSD: 16-pin QFN
1.2.1 Applications
Set top boxes
Point-of-Sale terminals
ATM machines
Metering terminals
Video game consoles
Internet appliances
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CX93011-2x CSMxx Data Sheet Introduction
1.3 Technical Overview
1.3.1 General Description
Modem operation, including dialing, call progress, telephone line interface, telephone
handset interface, and host DTE interface functions are supported and controlled
through the V.250 and V.253-compatible command set.
The OEM adds a crystal circuit, DIB components, telephone line interface, telephone
handset/telephony extension interface, and other supporting discrete components as
supported by the modem model (Table 1) and required by the application to complete
the system.
1.3.2 Embedded MCU Firmware
Embedded MCU firmware performs processing of general modem control, command
sets, data modem, error correction and data compression (ECC), worldwide, V.80, and
serial DTE host interface functions according to modem models (Table 2).
1.3.3 Operating Modes
1.3.3.1 Data/Fax Modes
Data modem modes perform complete handshake and data rate negotiations. Using
modem modulations to optimize modem configuration for line conditions, the modem
can connect at the highest data rate that the channel can support from 56 kbps down
to 2400 bps with automatic fallback.
In V.92 data modem mode (V.92 model), the modem can receive data from a digital
source using a V.92-compatible central site modem at line speeds up to 56 kbps. With
PCM upstream enabled, data transmission supports sending data at line speeds up to
48 kbps. When PCM upstream is disabled, data transmission supports sending data at
line speeds up to V.34 rates. This mode can fallback to V.34 mode and to lower rates
as dictated by line conditions.
The following modes in V.92 models are also supported when connected to a V.92-
compatible server supporting the feature listed.
Quick connect, which allows quicker subsequent connection to a server using
stored line parameters obtained during the initial connection. The server must
support quick connect profiles.
Modem-on-Hold, which allows detection and reporting of incoming phone calls on
the PSTN with enabled Call Waiting. If the incoming call is accepted by the user,
the user has a pre-defined amount of time of holding the data connection for a brief
conversation. The data connection resumes upon incoming call termination. The
server must support Modem-on-Hold functionality.
PCM upstream, which boosts the upstream data rates between the user and V.92
server. A maximum of 48 kbps upstream rate is supported when connected to a
V.92 server that supports PCM upstream.
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Introduction CX93011-2x CSMxx Data Sheet
In V.34 data modem mode (V.92 and V.34 models), the modem can operate in 2-wire,
full-duplex, asynchronous modes at line rates up to 33.6 kbps. Data modem modes
perform complete handshake and data rate negotiations. Using V.34 modulation to
optimize modem configuration for line conditions, the modem can connect at the
highest data rate that the channel can support from 33600 bps down to 2400 bps with
automatic fallback. Automode operation in V.34 is provided in accordance with
PN3320 and in V.32bis in accordance with PN2330. All tone and pattern detection
functions required by the applicable ITU or Bell standards are supported.
In V.32bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.
In fax modem mode, the modem can operate in 2-wire, half-duplex, synchronous
modes and can support Group 3 facsimile send and receive speeds of 14400, 12000,
9600, 7200, 4800, and 2400 bps. Fax data transmission and reception performed by
the modem are controlled and monitored through the EIA/TIA-578 Fax Class 1, T.31
Fax Class 1.0, or Fax Class 2 command interface. Full HDLC formatting, zero
insertion/deletion, and CRC generation/checking are provided.
1.3.3.2 V.44 Data Compression
V.44 provides more efficient data compression than V.42bis that significantly
decreases the download time for the types of files associated with Internet use. This
significant improvement is most noticeable when browsing and searching the web
since HTML text files are highly compressible. (The improved performance amount
varies both with the actual format and with the content of individual pages and files.)
1.3.3.3 Synchronous Access Mode (SAM) - Video Conferencing
V.80 Synchronous Access Mode between the modem and the host/DTE is provided
for host-controlled communication protocols, e.g., H.324 video conferencing
applications.
1.3.3.4 TAM Mode
TAM Mode features include 2-bit/4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit
linear PCM, and 8-bit µ-law and A-law PCM coding at 8 kHz sample rate. Tone
detection/ generation, call discrimination, and concurrent DTMF detection are also
supported.
TAM Mode is supported by four submodes:
Online Voice Command Mode supports connection to the telephone line.
Voice Receive Mode supports recording voice or audio data input from the
telephone line.
Voice Transmit Mode supports playback of voice or audio data to the telephone
line.
Full-duplex Receive and Transmit Mode
1.3.3.5 Worldwide Operation
The modem operates in TBR21-compliant and other countries. Country-dependent
modem parameters for functions such as dialing, carrier transmit level, calling tone,
call progress tone detection, answer tone detection, blacklisting, caller ID, and relay
control are programmable. SmartDAA technology allows a single PCB design and
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CX93011-2x CSMxx Data Sheet Introduction
single BOM to be homologated worldwide. Advanced features such as extension pick-
up detection, remote hang-up detection, line-in-use detection, and digital PBX line
protection are supported.
Country code IDs are defined by ITU-T T.35.
Internal ROM includes default profiles for 63 countries including TBR21-compliant
profiles. An additional or modified country profile can be loaded into internal SRAM. A
duplicate country profile stored in internal SRAM will override the profile in internal
ROM firmware. Additional country profiles can be loaded into external NVRAM for
permanent storage. The default countries supported are listed in Table 2. Request
additional country profiles from a Conexant Sales Office.
Table 2. Default Countries Supported (1 of 3)
Country Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
Argentina 7 X X
Australia 9 X X X
Austria 0A X X X
Belgium 0F X X
Brazil 16 X X
Bulgaria 1B X X
Canada 20 X X X
Chile 25 X X
China 26 X X X
Columbia 27 X X
Croatia FA X X
Cyprus 2D X X
Czech Republic 2E X X
Denmark 31 X X X
Egypt 36 X X
Estonia F9 X X
Finland 3C X X X
France 3D X X X
Germany 42 X X X
Greece 46 X X
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Hong Kong 50 X X X
Hungary 51 X X
Iceland 52 X X
India 53 X X X
Indonesia 54 X X
Ireland 57 X X X
Israel 58 X X
Italy 59 X X X
Japan 00 X X X
Korea 61 X X X
Kuwait 62 X X
Lebanon 64 X X
Luxembourg 69 X X
Malaysia 6C X X
Mexico 73 X X
Morocco 77 X X
Netherlands 7B X X X
New Zealand 7E X X X
Norway 82 X X X
Pakistan 84 X X
Philippines 89 X X
Poland 8A X X
Portugal 8B X X
Romania 8E X X
Russia B8 X X
Saudi Arabia 98 X X
Senegal 99 X X
Table 2. Default Countries Supported (2 of 3)
Country Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
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CX93011-2x CSMxx Data Sheet Introduction
1.3.4 Reference Designs
A reference design consisting of a motherboard and daughtercard set is available to
minimize modem design time, reduce development cost, and accelerate market entry.
The part numbers for this design are: CX-9Z-C00217 (motherboard) and CX-9Z-
C00218 (daughtercard).
A reference modem user’s guide (USG-201664) is available in electronic form. This
user’s guide includes schematics, bill of materials (BOM), vendor part list (VPL), board
layout files, and complete documentation.
Singapore 9C X X X
Slovakia FB X X
Slovenia FC X X
South Africa 9F X X
Spain A0 X X X
Sri Lanka A1 X X
Sweden A5 X X X
Switzerland A6 X X
Taiwan FE X X X
Thailand A9 X X
Tunisia AD X X
Turkey AE X X
United Kingdom B4 X X X
United Arab Emirates B3 X X
Uruguay B7 X X
USA 85 X X X
Reserved FD
Table 2. Default Countries Supported (3 of 3)
Country Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
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1.4 Hardware Description
1.4.1 CX93011-2x Modem
The CX93011-2x modem includes a Microcontroller (MCU), a Modem Data Pump
(MDP), internal ROM, internal RAM, and SmartDAA interface functions.
The modem connects to host via a logical V.24 (EIA/TIA-232-E) serial DTE interface.
The modem MCU/DSP performs the command processing, host interface functions
and telephone line signal modulation/demodulation which reduces computational load
on the host processor.
The SmartDAA Interface communicates with, and supplies power and clock to the
LSD through the DIB.
1.4.2 Digital Isolation Barrier
The OEM-supplied Digital Isolation Barrier (DIB) electrically DC isolates the CX93011-
2x from the LSD and telephone line. The modem is connected to a fixed digital ground
and operates with standard CMOS logic levels. The LSD is connected to a floating
ground and can tolerate high voltage input (compatible with telephone line and typical
surge requirements).
The DIB transformer couples power and clock from the CX93011-2x to the LSD. The
DIB data channel supports bidirectional half-duplex serial transfer of data, control, and
status information between the CX93011-2x and the LSD over two lines.
1.4.3 CX20548 SmartDAA Line Side Device
The CX20548 SmartDAA 4 Line Side Device (LSD) includes a Line Side DIB
Interface, a coder/decoder (codec), and a Telephone Line Interface (TLI).
The Line Side DIB Interface communicates with, and receives power and clock from,
the SmartDAA 4 interface in the host side device (HSD) through the DIB transformer.
The clock signal passing through the transformer is rectified in the LSD and filtered
using external capacitors.
Information is transferred between the LSD and the HSD through the DIB transformer
using pulse width modulation.
The TLI integrates DAA and direct telephone line interface functions and connects
directly to the line TIP and RING pins, as well as to external line protection
components.
Direct LSD connection to TIP and RING allows real-time measurement of telephone
line parameters, such as the telephone central office (CO) battery voltage, individual
telephone line (copper wire) resistance, and allows dynamic regulation of the off-hook
TIP and RING voltage and total current drawn from the central office (CO). This allows
the modem to maintain compliance with U.S. and worldwide regulations.
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1.5 Commands
The modem supports data modem and V.80 commands, and S Registers in
accordance with modem model options. See Doc. REM-201692 for a description of
the commands.
1.5.1 Data Modem Operation
Data modem functions operate in response to the AT commands when +FCLASS=0.
Default parameters support U.S./Canada operation.
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2Technical Specifications
2.1 Serial DTE Interface Operation
2.1.1 Automatic Speed/Format Sensing
2.1.1.1 Command Mode and Data Mode
The modem can automatically determine the speed and format of the data sent from
the DTE. The modem can sense speeds of 300, 600, 1200, 2400, 4800, 7200, 9600,
12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 38400, 57600, and
115200 bps and the following data formats:
The modem can speed sense data with mark or space parity and configures itself as
follows:
Parity Data Length
(Number of Bits) Number of Stop Bits Character Length
(Number of bits)
None 7 2 10
Odd 7 1 10
Even 7 1 10
None 8 1 10
Odd 8 1 11(1)
Even 8 1 11(1)
FOOTNOTES:
(1) 11-bit characters are sensed, but the parity bit is stripped off during data transmission in Normal and
Error Correction modes.
DTE Configuration Modem Configuration
7 mark 7 none
7 space 8 none
8 mark 8 none
8 space 8 even
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Technical Specifications CX93011-2x CSMxx Data Sheet
2.2 Establishing Data Modem Connections
2.2.1 Dialing
2.2.1.1 DTMF Dialing
DTMF dialing using DTMF tone pairs is supported in accordance with ITU-T Q.23.
2.2.1.2 Pulse Dialing
Pulse dialing is supported in accordance with EIA/TIA-496-A.
2.2.1.3 Blind Dialing
The modem can blind dial in the absence of a dial tone if enabled by the X0, X1, or X3
command.
2.2.2 Modem Handshaking Protocol
If a tone is not detected within the time specified in the S7 register after the last digit is
dialed, the modem aborts the call attempt.
2.2.3 Call Progress Tone Detection
Ringback, equipment busy, congested tone, warble tone, and progress tones can be
detected in accordance with the applicable standard.
2.2.4 Answer Tone Detection
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T
modes and 2225 ± 40 Hz in Bell modes.
2.2.5 Ring Detection
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave
input.
2.2.6 Billing Protection
When the modem goes off-hook to answer an incoming call, both transmission and
reception of data are prevented for 2 seconds to allow transmission of the billing tone
signal.
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CX93011-2x CSMxx Data Sheet Technical Specifications
2.2.7 Connection Speeds
The modem functions as a data modem when the +FCLASS=0 command is active.
Line connection can be selected using the +MS command. The +MS command
selects modulation, enables/disables automode, and selects minimum and maximum
line speeds (Table 3).
2.2.8 Automode
Automode detection can be enabled by the +MS command to allow the modem to
connect to a remote modem in accordance with draft PN-3320 for V.34 (Table 3).
Table 3. +MS Command Automode Connectivity
Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>,
(<min_tx_rate>), and <max_tx_rate>) Rates (bps)
Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21 V21 300
V.22 V22 1200
V.22bis V22B 2400 or 1200
V.23 V23C 1200
V.32 V32 9600 or 4800
V.32bis V32B 14400, 12000, 9600, 7200, or 4800
V.34/V.90 upstream(1) V34/V90 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400,
12000, 9600, 7200, 4800, or 2400
V.90 downstream(2) V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667, 45333,
44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333,
32000, 30667, 29333, 28000
V.92 downstream(2) V92 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667, 45333,
44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333,
32000, 30667, 29333, 28000
V.92 upstream(2) V92 48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667, 37333,
36000, 34667, 33333, 32000, 30667, 29333, 28000, 26667, 25333, 24000
FOOTNOTES:
(1) V.92 and V.34 models.
(2) V.92 models
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2.3 Data Mode
Data mode exists when a telephone line connection has been established between
modems and all handshaking has been completed.
2.3.1 Speed Buffering (Normal Mode)
Speed buffering allows a DTE to send data to, and receive data from, a modem at a
speed different than the line speed. The modem supports speed buffering at all line
speeds.
2.3.2 Flow Control
DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-to-
modem speed, the modem supports XOFF/XON or RTS/CTS flow control with the
DTE to ensure data integrity.
2.3.3 Escape Sequence Detection
The +++ escape sequence can be used to return control to the command mode from
the data mode. Escape sequence detection is disabled by an S2 Register value
greater than 127.
2.3.4 BREAK Detection
The modem can detect a BREAK signal from either the DTE or the remote modem.
The \Kn command determines the modem response to a received BREAK signal.
2.3.5 Telephone Line Monitoring
2.3.5.1 GSTN Cleardown (V.92, V.90, V.34, V.32bis, V.32).
Upon receiving GSTN Cleardown from the remote modem in a non-error correcting
mode, the modem cleanly terminates the call.
2.3.5.2 Loss of Carrier (V.22bis and Below).
If carrier is lost for a time greater than specified by the S10 register, the modem
disconnects.
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2.3.6 Fall Forward/Fallback (V.92/V.90/V.34/V.32bis/V.32)
During initial handshake, the modem will fallback to the optimal line connection within
V.92/V.90/V.34/V.32bis/V.32 mode depending upon signal quality if automode is
enabled by the +MS or N1 command.
When connected in V.92/V.90/V.34/V.32bis/V.32 mode, the modem will fall forward or
fallback to the optimal line speed within the current modulation depending upon signal
quality if fall forward/fallback is enabled by the%E2 command.
2.3.7 Retrain
The modem may lose synchronization with the received line signal under poor or
changing line conditions. If this occurs, retraining may be initiated to attempt recovery
depending on the type of connection. The modem initiates a retrain if line quality
becomes unacceptable if enabled by the %E command. The modem continues to
retrain until an acceptable connection is achieved, or until 30 seconds elapse resulting
in line disconnect.
2.3.8 Programmable Inactivity Timer
The modem disconnects from the line if data is not sent or received for a specified
length of time. In normal or error-correction mode, this inactivity timer is reset when
data is received from either the DTE or from the line. This timer can be set to a value
between 0 and 255 seconds by using register S30. A value of 0 disables the inactivity
timer.
2.3.9 DTE Signal Monitoring (Serial DTE Interface Only)
2.3.9.1 DTR#
When DTR# is asserted, the modem responds in accordance with the &Dn and &Qn
commands.
2.3.9.2 RTS#
RTS# is used for flow control if enabled by the &K command in normal or error-
correction mode.
2.3.10 Call Progress Speaker Interface
A digital speaker output (DSPKOUT) is supported. DSPKOUT is a square wave output
in Data mode used for call progress or carrier monitoring. This output can be optionally
connected to a low-cost on-board speaker, e.g., a sounducer, or to an analog speaker
circuit.
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2.3.11 Serial EEPROM Interface
The 20-pin QFN supports a 2-line serial interface to an optional serial EEPROM.
The EEPROM can hold information such as firmware customization, and country code
parameters. Data stored in EEPROM takes precedence over the factory default
settings.
A serial EEPROM is required only if additional storage is required for more country
profiles or customized firmware code.
The EEPROM size can range from 2 Kb (256 x 8) to 256 Kb (32K x 8) and must
support a clock frequency of at least 400 kHz. For overriding, adding new country
profiles, or loading NVRAM patches, the EEPROM size must be larger than 2Kb. The
size of the EEPROM device will depend on the number of country profiles added or
patch size.
2.4 V.92 Features (V.92 Model)
Modem-on-Hold, quick connect, and PCM upstream are only available when
connecting in V.92 data mode. V.92 features are only available when the server called
is a V.92 server that supports that particular feature.
2.4.1 Modem-on-Hold
The Modem-on-Hold (MOH) function enables the modem to place an Internet data
connection on hold while using the same line to accept an incoming or place an
outgoing voice call. This feature is available only with a connection to a server
supporting MOH. MOH can be executed through either of two methods:
One method is to enable MOH through the +PMH command. With Call Waiting
Detection (+PCW command) enabled, an incoming call can be detected while on-
line. Using a string of commands, the modem negotiates with the server to place
the data connection on hold while the line is released so that it can be used to
conduct a voice call. Once the voice call is completed, the modem can quickly
renegotiate with the server back to the original data call.
An alternative method is to use communications software that makes use of the
Conexant Modem-on-Hold drivers. Using this method, the software can detect an
incoming call, place the data connection on hold, and switch back to a data
connection.
2.4.2 Quick Connect
The quick connect function enables the modem to shorten the connect time of
subsequent calls to a server supporting quick connect. The quick connect feature is
supported by the +PQC command.
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2.4.3 PCM Upstream
PCM upstream boosts the upstream data rates between the user and ISP to reduce
upload times for large files and e-mail attachments. A maximum of 48 kbps upstream
rate is supported with PCM upstream enabled, in contrast to a maximum of 32.2 kbps
upstream rate with PCM upstream not enabled. PCM upstream is supported by the
+PCM command. PCM upstream is disabled by default.
2.5 Error Correction and Data Compression
2.5.1 V.42 Error Correction
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The
modem provides a detection and negotiation technique for determining and
establishing the best method of error correction between two modems.
2.5.2 MNP 2-4 Error Correction
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data
integrity. Supporting stream mode, the modem sends data frames in varying lengths
depending on the amount of time between characters coming from the DTE.
2.5.3 V.44 Data Compression
V.44 data compression encodes pages and files associated with Web pages more
efficiently than V.42bis. These files include WEB pages, graphics and image files, and
document files. V.44 can provide an effective data throughput rate up to DTE rate for a
56-kbps connection. The improved performance amount varies both with the actual
format and with the content of individual pages and files.
2.5.4 V.42bis Data Compression
V.42bis data compression mode, enabled by the %Cn command or S46 register,
operates when a LAPM connection is established.
The V.42bis data compression employs a “string learning” algorithm in which a string
of characters from the DTE is encoded as a fixed length codeword and stored in a
dictionary. The dictionary is dynamically updated during normal operation.
2.5.5 MNP 5 Data Compression
MNP 5 data compression mode, enabled by the %Cn command, operates during an
MNP connection. In MNP 5, the modem increases its throughput by compressing data
into tokens before transmitting it to the remote modem, and by decompressing
encoded received data before sending it to the DTE.
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2.6 Voice/Audio Mode
Voice and audio functions are supported by the Voice Mode. Voice Mode includes four
submodes: Online Voice Command Mode, Voice Receive Mode, Voice Transmit Mode
and Full-Duplex Receive and Transmit Mode.
2.6.1 Online Voice Command Mode
This mode results from the connection to the telephone line or a voice/audio I/O
device (e.g., microphone, speaker, or handset) through the use of the +FCLASS=8
and +VLS commands. After mode entry, AT commands can be entered without
aborting the connection.
2.6.2 Voice Receive Mode
This mode is entered when the +VRX command is active in order to record voice or
audio data input at the RIN pin, typically from a microphone/handset or the telephone
line.
Received analog voice samples are converted to digital form and compressed for
reading by the host. AT commands control the codec bits-per-sample rate.
Received analog mono audio samples are converted to digital form and formatted into
8-bit unsigned linear PCM format for reading by the host. AT commands control the bit
length and sampling rate. Concurrent DTMF/tone detection is available at the 8 kHz
sample rate.
2.6.3 Voice Transmit Mode
This mode is entered when the +VTX command is active in order to playback voice or
audio data to the TXA output, typically to a speaker/handset or to the telephone line.
Digitized voice data is decompressed and converted to analog form at the original
compression quantization sample-per-bits rate then output to the TXA output.
Digitized audio data is converted to analog form then output to the TXA output.
2.6.4 Full-Duplex Receive and Transmit Mode
This mode is entered when the +VTR command is active in order to concurrently
receive and transmit voice.
2.6.5 Audio Mode
The audio mode enables the host to transmit and receive 8-bit audio signals. In this
mode, the modem directly accesses the internal analog-to-digital (A/D) converter
(ADC) and the digital-to-analog (D/A) converter (DAC). Incoming analog audio signals
can then be converted to digital format and digital signals can be converted to analog
audio output.
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2.6.6 Tone Detectors
The tone detector signal path is separate from the main received signal path thus
enabling tone detection to be independent of the configuration status. In Tone Mode,
all three tone detectors are operational.
2.7 V.80 Synchronous Access Mode (SAM)
V.80 Synchronous Access Mode between the modem and the host/DTE is provided
for host-controlled communication protocols, e.g., H.324 video conferencing
applications.
Voice-call-first (VCF) before switching to a videophone call is also supported.
2.8 Telephony Extensions
The following telephony extension features are supported and are typically
implemented in designs for set-top box applications to enhance end-user experience:
Line-in-use detection
Extension pick-up detection
Remote hang-up detection
The telephony extension features are enabled through the -STE command. The -TTE
command can be used to adjust the voltage thresholds for the telephony extension
features.
2.8.1 Line-in-Use Detection
The line-in-use detection feature can stop the modem from disturbing the phone line
when the line is already being used. When an attempt is made to dial using ATDT and
the phone line is in use, the modem will not go off hook and will respond with the
message “LINE IN USE”.
2.8.2 Extension Pick-up Detection
The extension pick-up detection feature (also commonly referred as PPD or Parallel
phone detection) allows the modem to detect when another telephony device (i.e., fax
machine, phone, satellite/cable box) is attempting to use the phone line. When an
extension pick-up has been detected, the modem will go on-hook and respond with
the message “OFF-HOOK INTRUSION”.
This feature can be used to quickly drop a modem connection in the event when a
user picks up an extension phone line. For example, this feature allows set top boxes
with an integrated CSMxx modem to give normal voice users the highest priority over
the telephone line.
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2.8.3 Remote Hang-up Detection
The remote hang-up detection feature will cause the modem to go back on-hook and
respond with the message “LINE REVERSAL DETECTED” during a data connection
when the remote modem is disconnected for abnormal termination reasons (remote
phone line unplugged, remote server/modem shutdown).
2.9 Point-of-Sales Support
Point-of-Sales (POS) terminals usually need to exchange a small amount of data in
the shortest amount of time. Low speed modulations such as Bell212A or V.22 are still
mainly used in POS applications. Additionally, new non-standard sequences have
been developed to better support POS applications.
Industry standard and shortened answer tone B103 and V.21 are supported, as well
as FastPOS (V.29) and V.22 FastConnect. POS terminal modulations are supported
by the $F command.
2.10 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation
Facsimile functions operate in response to fax class 1 commands when +FCLASS=1,
to fax class 1.0 commands when +FCLASS=1.0, or to fax class 2 commands when
+FCLASS=2.
In the fax mode, the on-line behavior of the modem is different from the data (non-fax)
mode. After dialing, modem operation is controlled by fax commands. Some AT
commands are still valid but may operate differently than in data modem mode.
Calling tone is generated in accordance with T.30.
2.11 Tone Detectors
The modem is equipped with three tone detectors with separate signal paths from the
main received signal path thus enabling tone detection to be independent of the
configuration status.
2.12 Call Waiting Tone Detection
Call Waiting tones can be detected when in V.92, V.90, V.34, and V.32bis data modes.
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2.13 Caller ID
Both Type I Caller ID (On-Hook Caller ID) and Type II Caller ID (Call Waiting Caller ID)
are supported for U.S. and many other countries (see Section 2.14). Both types of
Caller ID are enabled/disabled using the +VCID command. Call Waiting Tone
detection must be enabled using the +PCW command to detect and decode Call
Waiting Caller ID. When enabled, caller ID information (date, time, caller code, and
name) can be passed to the DTE in formatted or unformatted form. Inquiry support
allows the current caller ID mode and mode capabilities of the modem to be retrieved
from the modem.
Type II Caller ID (Call Waiting Caller ID) detection operates only during data mode in
V.92, V.90, V.34, V.32bis, or V.32.
2.14 Worldwide Country Support
Internal modem firmware supports 63 country profiles (see Table 2). These country
profiles include the following country-dependent parameters: • Dial tone detection
levels and frequency ranges.
DTMF dialing parameters: Transmit output level, DTMF signal duration, and DTMF
interdigit interval.
Pulse dialing parameters: Make/break times, set/clear times, and dial codes are
programmable.
Ring detection frequency range.
Type I and Type II Caller ID detection are supported for many countries. Contact
your local Conexant sales office for additional country support. • Blind dialing
enabled/disable.
Carrier transmit level. The maximum, minimum, and default values can be defined
to match specific country and DAA requirements.
Calling tone is generated in accordance with V.25. Calling tone may be toggled
(enabled/disabled) by inclusion of a “^” character in a dial string. It may also be
disabled.
Frequency and cadence of tones for busy, ringback, congested, warble, dial tone
1, and dial tone 2.
Answer tone detection period.
Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to
the same number when previous call attempts have failed. Call failure can be
detected for reasons such as no dial tone, number busy, no answer, no ringback
detected, voice (rather than modem) detected, and key abort (dial attempt aborted
by user). Actions resulting from such failures can include specification of minimum
inter-call delay, extended delay between calls, and maximum numbers of retries
before the number is permanently forbidden (“blacklisted”).
The country profiles may be altered or customized by modifying the country-
dependent parameters. Additional profiles may also be included. Additional and
modified country profiles are supported by internal SRAM.
Please contact an FAE at the local Conexant sales office for additional and modified
country profile support.
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2.15 Diagnostics
Diagnostics are performed in response to test commands.
2.15.1 Analog Loopback (&T1 Command).
Data from the local DTE is sent to the modem, which loops the data back to the local
DTE.
2.15.2 Analog Loopback (&T1 Command).
Data from the local DTE is sent to the modem, which loops the data back to the local
DTE.
2.16 Low Power Modes
The modem enters a low power mode when no line connection exists and no host
activity occurs for the period of time specified in the S24 register. The modem supports
four low power modes: Idle Mode, Sleep Mode, Deep Sleep Mode, and Stop Mode.
The low power mode entered depends on the setting of the –SLP command.
2.16.1 Idle Mode
In Idle mode, the CPU and SPX clocks stop, and the SSD clock runs at low frequency.
The modem can detect and qualify ring signals and process AT commands. The
modem returns to normal mode upon receiving an AT command or receiving a
qualified ring.
2.16.2 Sleep Mode
In Sleep mode, the SPX clock stops, and the CPU and SSD clocks run at low
frequency. The modem can detect and qualify ring signals. The modem cannot
process AT commands. The modem can be awakened by the host sending a single
(any) character (typically followed by an AT command) or by the modem receiving a
qualified ring.
2.16.3 Deep Sleep Mode
In Deep Sleep mode, the SPX and SSD clocks stop, and the CPU clock runs at low
frequency. The modem can detect and qualify ring signals. The modem cannot
process AT commands. The modem can be awakened by the host sending a single
(any) character (typically followed by an AT command) or by the modem receiving a
qualified ring.
2.16.4 Stop Mode
In Stop mode, the CPU, SPX and SSD clocks stop. The modem cannot process AT
commands and cannot detect and qualify ring signals. The modem can be awakened
by the host sending a single (any) character (typically followed by an AT command).
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3Hardware Interface
3.1 CX93011-2x Modem Hardware Interface Signals
3.1.1 CX93011-2x Modem Interface Signal Summary
3.1.1.1 LSD Interface (Through DIB)
The DIB interface signals are:
DIBP
DIBN
3.1.1.2 Call Progress Speaker Interface
The call progress speaker interface signal is:
Digital speaker output (DSPKOUT); output
3.1.1.3 Clock Select Interface
The clock select interface signal is:
Clock Select (CLKSEL); input
3.1.1.4 Serial EEPROM Interface
The 2-line serial interface signals to an optional serial EEPROM are:
Bidirectional Data input/output (NVMDATA)
Clock output (NVMCLK)
3.1.1.5 Serial DTE Interface and Indicator Outputs
The supported DTE interface signals are:
Serial Transmit Data input (TXD#)
Serial Receive Data output line (RXD#)
Clear to Send output (CTS#)
Received Line Signal Detector output (RLSD#)
Ring Indicator output (RI#)
Data Terminal Ready control input (DTR#)
Request to Send control input (RTS#)
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3.1.2 CX93011-2x Modem Pin Assignments and Signal Definitions
CX93011-2x Modem hardware interface signals are shown by major interface in
Figure 2, are shown by pin number in Figure 3, and are listed by pin number in
Table 4.
CX93011-2x Modem hardware interface signals are defined in Table 5.
Figure 2. CX93011-2x Modem Hardware Interface Signals
Figure 3. CX93011-2x Modem 20-Pin QFN Pin Signals
XTLI
XTLO
TXD#
RXD#
CTS#
RLSD#
RI#
DTR#
RTS#
NVMCLK/CLKSEL
NVMDATA
RESET#
LPO
18
19
2
1
6
8
9
7
5
4
12
20
14
SERIAL HOST
INTERFACE
DIBN
DIBP
DSPKOUT
VDD_CORE
VDD
VDD
GND
PADDLE (GND)
10
11
17
15
3
13
16
21
CX93011-2x
Modem
20-Pin QFN
DIGITAL ISOLATION
BARRIER (DIB)
RESET CIRCUIT
SPEAKER CIRCUIT
+3.3V
240 kΩ
+3.3V
28.224 OR 27.000 MHZ
CRYSTAL OR CLOCK
OSCILLATOR
FREQUENCY SELECT CIRCUIT
SERAIL EEPROM
+1.2V DECOUPLING
GENERAL NOTE: PADDLE (GND), indicated as Pin 21, is a conductive surface on the bottom of the device and must be
connected to system side digital ground.
FOOTNOTE: (1) 20 kΩ pull-down resistor required.
20 kΩ(1)
CTS#
DTR#
RLSD#
RI#
DIBN
6
7
8
9
10
RESET#
XTLO
XTLI
DSPKOUT
GND
20
19
18
17
16
GENERAL NOTE: PADDLE (GND is a conductive surface on the bottom of the device and is indicated as pin 21.
CX93011-2X
VDD_CORE
LPO
VDD
NVMDATA
DIBP
RXD#
TXD#
VDD
NVMCLK/CLKSEL
RTS#
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Table 4. CX93011-2x Modem 20-Pin QFN Pin Signals
Pin Number Signal Name Pin Number Signal Name
1RXD# 11DIBP
2 TXD# 12 NVMDATA
3VDD 13VDD
4 NVMCLK/CLKSEL 14 LPO
5RTS# 15VDD_CORE
6CTS# 16GND
7 DTR# 17 DSPKOUT
8 RLSD# 18 XTLI
9 RI# 19 XTLO
10 DIBN 20 RESET#
21 PADDLE (GND)(1)
FOOTNOTES:
(1) PADDLE (GND) is a conductive surface on the bottom of the device and is indicated as pin 21.
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Table 5. CX93011-2x Modem 20-Pin QFN Pin Signals (1 of 2)
Label Pin I/O I/O Type Signal Name/Description
System
XTLI
XTLO
18
19
I
O
Ix
Ox
Crystal In and Crystal Out. If an external 27 or 28.224 MHz crystal circuit is
used instead of an external clock circuit, connect XTLI and XTLO to the
external crystal circuit. When an external clock circuit is used, connect the
clock signal to XTLI and leave XTLO open. (See CLKSEL pin description.)
NVMCLK/CLKSEL 4 I Ipu/O2 Clock Frequency Select (CLKSEL). Clock frequency is selected by CLKSEL
during reset processing. Leave open for 28.224 MHz operation; connect pin to
digital ground (GND) through 10 kΩ for 27.000 MHz operation. This signal is
multiplexed with NVMCLK.
RESET# 20 I Ipu/O2 Reset. The active low RESET# input resets the modem logic and clears the
internal SRAM. RESET# low holds the modem in the reset state; RESET#
going high releases the modem from the reset state. During application of
VDD, RESET# must be held low before VDD power is applied and for at least
15 ms after VDD reaches operating range. The modem device set is ready to
use 25 ms after the low-to-high transition of RESET#.
Since some application may use external host GPIO to control RESET#
signal, it will be necessary to have an external 20 kΩ pull-down resistor on
RESET# to ensure signal is low while applying VDD to the system.
VDD_CORE 15 O PWR +1.2V Internal Core Voltage Filter. Internal +1.2 V core voltage for
decoupling. Do not connect this pin to an external +1.2 V power supply.
VDD 3,13 O PWR Digital and I/O Circuits Supply Voltage. Connect this pin to an external +3.3
V power supply.
GND 16 I GND Digital Ground. Connect to digital ground (GND).
PADDLE (GND) 21 G GND Paddle Ground. Connect to digital ground (GND).
LPO 14 I Low Power Oscillator. Connect to +3.3V through 240 kΩ.
Speaker Interface
DSPKOUT 17 O Ipd/O2 Modem Speaker Digital Output. The DSPKOUT digital output reflects the
received analog input signal digitized to TTL high or low level by an internal
comparator.
DIB Interface
DIBN 10 O Opdc DIB Negative. Provides clock and power to the LSD, and transfers data,
control and status information between the SSD and LSD. Connect to DIB
transformer primary winding terminal.
DIBP 11 O Opdc DIB Positive. Provides clock and power to the LSD and transfers data, control
and status information between the SSD and LSD. Connect to DIB transformer
primary winding terminal.
NVRAM Interface
NVMCLK/CLKSEL 4 I/O Ipu/O2 NVRAM Clock (NVMCLK). During normal operation, NVMCLK/CLKSEL
output high enables the EEPROM. Connect to EEPROM SCL pin. This signal
is multiplexed with CLKSEL.
NVMDATA 12 I/O Ipu/O2 NVRAM Data. The NVMDATA pin supplies a serial data interface to the
EEPROM. Connect to EEPROM SDA pin and to +3.3V through 10 KΩ.
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V.24 (EIA/TIA-232-E) DTE Serial Interface
TXD# 2 I Ipu/O2 Transmitted Data (EIA BA/ITU-T CT103). The DTE uses the TXD# line to
send data to the modem for transmission over the telephone line or to transmit
commands to the modem.
RXD# 1 O Ipu/O2 Received Data (EIA BB/ITU-T CT104). The modem uses the RXD# line to
send data received from the telephone line to the DTE and to send modem
responses to the DTE. During command mode, RXD# data represents the
modem responses to the DTE.
CTS# 6 O Ipu/O2 Clear To Send (EIA CB/ITU-T CT106). CTS# output ON (low) indicates that
the modem is ready to accept data from the DTE. In error correction or normal
mode, CTS# is always ON (low) unless RTS/CTS flow control is selected by
the &Kn command.
RTLSD# 8 O Ipu/O2 Received Line Signal Detector (EIA CF/ITU-T CT109). During normal
operation, when AT&C0 command is not in effect, RLSD# output is ON when a
carrier is detected on the telephone line or OFF when carrier is not detected.
RI# 9 O Ipu/O2 Ring Indicator (EIA CE/ITU-T CT125). RI# output ON (low) indicates the
presence of an ON segment of a ring signal on the telephone line.
DTR# 7 I Ipu/O2 Data Terminal Ready (EIA CD/ITU-T CT108). The DTR# input is turned ON
(low) by the DTE when the DTE is ready to transmit or receive data. DTR# ON
prepares the modem to be connected to the telephone line, and maintains the
connection established by the DTE (manual answering) or internally
(automatic answering). DTR# OFF places the modem in the disconnect state
under control of the &Dn and &Qn commands.
RTS# 5 I Ipu/O2 Request To Send (EIA CA/ITU-T CT105). RTS# input ON (low) indicates that
the DTE is ready to send data to the modem. In the command state, the
modem ignores RTS#. The modem ignores RTS# unless RTS/CTS flow
control is selected by the &Kn command.
GENERAL NOTES: I/O Types: See Table 6.
Table 5. CX93011-2x Modem 20-Pin QFN Pin Signals (2 of 2)
Label Pin I/O I/O Type Signal Name/Description
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3.1.3 CX93011-2x Modem Electrical Characteristics
CX93011-2x I/O types are defined in Table 6. CX93011-2x DC electrical
characteristics are listed in Table 7.
Table 6. CX93011-2x Modem I/O Type Definitions
I/O Type Description
Idd/Odd Digital input/output, DIB data transceiver
Ix/Ox I/O, wire
Ipd/O2 Digital input, 120 kΩ pull-down/Digital output, 2 mA
Ipu/O2 Digital input, 120 kΩ pull-up / Digital output, 2 mA
Ippu/O2 Digital input, Programmable 120 kΩ pull-up / Digital output, 2 mA
Odpc Digital output with adjustable drive, DIB clock and power
Rx Oscillator Pad, place 120 kΩ resistor from pad to VDD
PWR Power
GND Ground
GENERAL NOTES:
1. See DC characteristics in Table 7.
2. I/O Type corresponds to the device Pad Type. The I/O column in signal interface tables refers to signal I/O direction used in the
application.
Table 7. CX93011-2x Modem DC Electrical Characteristics
Parameter Symbol Minimum Maximum Units Test Conditions
Input Voltage Low VIL 0 0.3 *VDD V
Input Voltage High VIH 0.7 * VDD VDD V
Input Current (no Pull-Down or Pull-Up) IIL -1 +1 μAOEN = 1
Input Current (Pull-Down) IPD +6 +30 μA VIN = VDD
Input Current (Pull-Up) IPU -300 -60 μA VIN = GND
Output Voltage Low VOL 0 0.4 V IOL = +2 mA
Output Voltage High VOH VDD-0.4 VDD V IOL = -2 mA
Output Impedance Z 25 95 Ω
Pull-Up Resistance Rpu 120 500 kΩVIN = GND
Pull-Down Resistance Rpd 120 500 kΩVIN = VDD
GENERAL NOTES: Test Conditions unless otherwise stated: VDD = +3.3V ± 5%; TA = -10°C to 70°C; external load = 50 pF.
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3.2 CX20548 LSD Hardware Pins and Signals
3.2.1 General
3.2.1.1 Host Side Device (HSD) Interface (Through DIB)
The DIB interface signals are:
DIB Positive (DIBP, pin 14); input/output
DIB Negative (DIBN, pin 16); input/output
3.2.1.2 Power and Ground
The power and ground signals are:
Unregulated Power Output (PWR, pin 15)
Regulated Digital Power Output (DVDD, pin 1)
Regulated Analog Power Output (AVDD, pin 2)
Analog Ground (PADDLE [AGND]); Analog ground
3.2.1.3 Telephone Line Interface
The telephone line interface signals are:
RING AC Coupled (RAC, pin 4); input
TIP AC Coupled (TAC, pin 5); input
Electronic Inductor Capacitor (EIC, pin 11)
Electronic Inductor Output (EIO, pin 10)
Electronic Inductor Feedback (EIF, pin 9)
Receive Analog Input (RXI, pin 6); input
Transmit Output (TXO, pin 8); output
Transmit Feedback (TXF, pin 7); input
3.2.1.4 Voltage References
There is on reference voltage pin:
Output Middle (Center) Reference Voltage (VC, pin 3); output for decoupling
3.2.1.5 General Purpose Input/Output
There is one unassigned general purpose input/output pin:
General Purpose Input/Output (GPIO, pin 13); input/output
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3.2.2 Pin Assignments and Signal Definitions
CX20548 LSD hardware interface signals are shown by major interface in Figure 4,
are shown by pin number in Figure 5, and are listed by pin number in Table 8.
CX20548 LSD hardware interface signals are defined in Table 9. CX20548 LSD GPIO
DC characteristics are specified in Table 10. CX20548 LSD AVDD DC characteristics
are specified in Table 11.
NOTE: Pin 17 is shown in Figure 4 to ensure that the PADDLE is considered
when laying out the printed circuit board. The PADDLE is the analog
ground pin of the CX20548 device and must be connected to LSD
analog ground (AGND_LSD) when the CX20548 is populated in a PCB.
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Figure 4. CX20548 LSD Hardware Interface Signals
Figure 5. CX20548 LSD 16-Pin QFN Pin Signals
RAC
TAC
EIC
EIO
EIF
RXI
TXO
TXF
VC
GPIO
4
5
11
10
9
6
8
7
3
13
AGND_LSD
AGND_LSD
C844
NC
DIBN
DIBP
TEST
DVDD
PWR+
AVDD
PADDLE (AGND)
16
14
2
1
15
2
17
C828
AGND_LSD
DIBN
DIBP
C852
C850
GENERAL NOTES:
1. Consult applicable reference design for exact component placement and values, and for layout guidelines.
2. The PADDLE (indicated as Pin 17) is the analog ground pin of the CX20548 device and must be connected to LSD analog ground (AGND_LSD)
when the CX20548 is populated in a printed circuit board (PCB).
C862
C870
AGND_LSD
AGND_LSD
R802
R804
R854
AGND_LSD
C830
T802
Receive
Coupling
Impedance
Matching
and
Transmitter
Electronic
Inductor,
Off-Hook,
Pulse Dial,
and TIP and
RING VI
Control
Safety
and EMI
Protection
CX20548
SmartDAA4
Line Side
Device
16-Pin QFN
Digital
Isolation
Barrier
Telephone
Line
Connector
TIP
RING
CX20548
1
2
3
4
DVDD
AVDD
VC
RAC
TAC
RXI
TXF
TXO
TEST
EIC
EIO
EIF
DIBN
PWR
DIBP
GPIO
12
11
10
9
5
6
7
8
16
15
14
13
GENERAL NOTE: The PADDLE, a connective surface located on the bottom of the package and referred to as pin 17, is
connected internally to analog ground (AGND).
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Table 8. CX20548 LSD 16-Pin QFN Pin Signals
Pin Signal Label Pin Signal Label
1 DVDD 9 EIF
2AVDD 10EIO
3VC 11EIC
4 RAC 12 TEST
5TAC 13GPIO
6 RXI 14 D/BP
7 TXF 15 PWR
8 TXO 16 B/BN
17 PADDLE (AGND)
Table 9. CX20548 LSD Hardware Signal Definitions (1 of 2)
Label Pin I/O I/O Type Signal Name/Description
System Interface Signals
PWR 15 PWR PWR Unregulated Power Output. Unregulated power output from the
internal rectifier, connect to AGND_LSD through C870.
VC 3 REF REF Output Middle Reference Voltage. Connect to AGND_LSD
through C844, which must be placed close to pin 3. Use a short
path and a wide trace to the AGND_LSD pin.
AVDD 2 PWR PWR Analog Power Output. Provides external connection point for
decoupling. (AVDD is routed internally to LSD analog circuits.)
Connect to AGND_LSD through C828. C828 must be placed
close to pin 2.
DVDD 1 PWR PWR Digital Power Output. Provides external connection point for
decoupling. Connect to AGND_LSD through C830. Place C830
near pin 1.
PADDLE
(AGND)
17 AGND_LSD AGND_LSD Paddle Analog Ground. The conductive surface located on the
bottom of the package and referred to as pin 17 is connected
internally to device analog ground. Connect to AGND_LSD.
DIB Interface Signals
DIBP 14 I/O I/O DIB Positive. Positive terminal of DIB, connect to secondary of
DIB transformer.
DIPN 16 I/O I/O DIB Negative. Negative terminal of DIB, connect to secondary of
DIB transformer.
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TIP and RING Interface Signals
RAC 4 I Ia RING AC Coupled and TIP AC Coupled. Un-rectified voltage
from telephone line used to detect ring. Connect RAC to the diode
bridge AC node (RING) through R802 (connects to pin 4).
Connect TAC to the diode bridge AC node (TIP) through R804
(connects to pin 5).
TAC 5 I Ia
EIC 11 O Oa Electronic Inductor Capacitor. Electronic inductor filtering
capacitor. Connect to AGND_LSD through C858.
EIO 10 O Oa Electronic Inductor Output. Calculated voltage is applied to this
output to control off-hook and DC VI mask operation. Connect to
base of Q804.
EIF 9 I Ia Electronic Inductor Feedback. Connect to emitter of Q804
through R826.
RXI 6 I Ia Receive Analog Input. Receiver operational amplifier inverting
input. AC coupled to the Bridge_CC node through R810
(connects to pin 6) and C810 in series. R810 and C810 must be
placed very close to pin 6. The length of the PCB trace connecting
R810 to the RXI pin must be kept at an absolute minimum.
TXO 8 O Oa Transmit Output. Outputs transmit signal and impedance
matching signal; connect to base of transistor Q802.
TXF 7 I Ia Transmit Feedback. Connect to emitter of transistor Q802.
Not Used
GPIO 13 I/O It/Ot12 General Purpose I/O. Leave open if not used.
GENERAL NOTES:
1. I/O types*:
2. Refer to applicable reference design for exact component placement and values.
Table 9. CX20548 LSD Hardware Signal Definitions (2 of 2)
Label Pin I/O I/O Type Signal Name/Description
Ia Analog input
It Digital input*
Oa Analog output
Ot12 Digital output*
AGND_LSD Isolated LSD Analog Ground (isolated from the host system ground)
*See CX20548 LSD GPIO DC Electrical Characteristics (Table 10).
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Table 10. CX20548 LSD GPIO DC Electrical Characteristics
Parameter Symbol Minimum Typical Maximum Units Test Conditions
Input Voltage VIN –0.30 — 3.465 V DVDD = +3.465 V
Input Voltage Low VIL ——1.0V
Input Voltage High VIH 1.6 — — V
Output Voltage Low VOL 0—0.33V
Output Voltage High VOH 2.97 — — V
Input Leakage Current — –10 — 10 μA
Output Leakage Current (High Impedance) — –10 — 10 μA
GPIO Output Sink Current at 0.33 V maximum — 2.4 — — mA
GPIO Output Source Current at 2.97 V minimum — 2.4 — — mA
GPIO Rise Time/Fall Time 20 100 ns
GENERAL NOTES: Test Conditions, unless otherwise stated: DVDD = +3.3 V +5%; TA = 0°C to 70°C; external load = 50 pF.
Table 11. CX20548 LSD AVDD and DVDD DC Electrical Characteristics
PWR Input AVDD Output DVDD Output
+3 V < PWR < +4.0 V +3 V + 5% +3 V + 5%
GENERAL NOTES: PWR must be at least 100 mV higher than AVDD. See PWR, AVDD, and DVDD descriptions in Table 9.
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3.3 Operating Conditions, Absolute Maximum Ratings, and
Power Requirements
The CX93011-2x operating conditions are specified in Table 12.
The CX93011-2x absolute maximum ratings are listed in Table 13.
The CX93011-2x current and power requirements are listed in Table 14.
Table 12. CX93011-2x Modem Operating Conditions
Parameter Symbol Limits Units
Supply Voltage VDD +3.3 + 5% VDC
Operating Ambient Temperature TA0 to +70 °C
GENERAL NOTES: Voltages referenced to ground (VSS).
Table 13. Absolute Maximum Ratings
Parameter Symbol Limits Units
VDD Supply Voltage VDD -0.5 to +4.0 VDC
Storage Temperature Range TSTG -55 to +125 °C
Relative Humidity HREL Up to 90% non-condensing, or a wet
bulb temperature up to 35 °C,
whichever is less.
Input Voltage VIN -0.3 to (VDD + 0.3) VDC
Voltage Applied to Outputs in High Impedance (Off) State VHZ -0.5 to +5.5 VDC
DC Input Clamp Current IIK ±20 mA
DC Output Clamp Current IOK ±20 mA
Static Discharge Voltage (25°C) VESD ±2500 VDC
Latch-up Current (25°C) ITRIG ±400 mA
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3.3.1 Handling CMOS Devices
The device contains circuitry to protect the inputs against damage due to high static
voltages. However, it is advised that normal precautions be taken to avoid application
of any voltage higher than maximum rated voltage.
An unterminated input can acquire unpredictable voltages through coupling with stray
capacitance and internal cross talk. Both power dissipation and device noise immunity
degrades. Therefore, all inputs should be connected to an appropriate supply voltage.
Input signals should never exceed the voltage range from -0.3V to (VDD + 0.3) V. This
prevents forward biasing the input protection diodes and possibly entering a latch up
mode due to high current transients.
Table 14. CX93011-2x Current and Power Requirements
Mode Typical Current
(mA)
Maximum Current
(mA)
Typical Power
(mW)
Maximum Power
(mW)
Normal Mode: On-hook, Idle, waiting for ring 75 85 248 295
Normal Mode: Off-hook, normal data connection 87 97 287 336
Idle Mode (-SLP=0) 16 23 53 80
Sleep Mode (-SLP=1) 16 23 53 80
Deep Sleep Mode (-SLP=2) 7 13 23 45
Stop Mode (-SLP=3) 5 11 17 38
GENERAL NOTES:
1. Test conditions: VDD = +3.3V for typical values; VDD = +3.465V for maximum values.
2. Input Ripple ≤ 0.1 Vpeak-peak.
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3.4 Crystal and Clock Specifications
Crystal specifications are listed in Tab le 15. Clock specifications are listed in Table 16.
Table 15. Crystal Specifications
Characteristics Value
Frequency 28.224 or 27.000 MHz nominal
Calibration Tolerance ±50 ppm at 25°C (CL = 16.5 and 19.5 pF)
Frequency Stability vs. Temperature ±35 ppm (-10°C to 70°C)
Frequency Stability vs. Aging ±20 ppm/5 years
Oscillation Mode Fundamental
Calibration Mode Parallel resonant
Load Capacitance, CL18 pF nominal
Shunt Capacitance, CO7 pF maximum
Series Resistance, R135-60 Ω maximum @ 20 nW drive level
Drive Level 100 µW correlation; 500 µW maximum
Operating Temperature -10°C to 70°C
Storage Temperature –40°C to 85°C
Table 16. Clock Specifications
Characteristics Value
Type Square wave
Frequency 28.224 or 27.000 MHz nominal
Level 3.3 Vp-p ± 0.3 V zero offset
Duty Cycle 50 ± 10%
Stability ±50
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4Package Dimensions
The CX93011-2x comes in a 20-pin package in either punch or sawn style. Both are
electrically equivalent and share the same footprint. Table 17 provides a dimension
table that is common to both QFN styles. The punch-style package is shown in
Figure 6, and the sawn-style package is shown in Figure 7.
Table 17. Package Dimensions for 20-Pin Punch and Sawn Styles
Dim. mm Note
Min. Nom. Max.
e 0.8 BSC
L0.5 0.75
b 0.28 0.4
D2 3.95 4.25
E2 3.95 4.25
A0.8 0.90
A1 0.00 0.05
A3 0.20 REF.
D 6.00 BSC
D1 5.75 BSC (1)
E 6.00 BSC
E1 5.75 BSC (1)
GENERAL NOTES:
1. All dimensions in mm.
2. Shape of Pin #1 indicator on the bottom of package can be different (i.e., Chamfer, Half Circle).
FOOTNOTES:
(1) This dimension is applied only for Punched QFN.
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Package Dimensions CX93011-2x CSMxx Data Sheet
Figure 6. Package Dimensions for 20-Pin QFN, Punch Style
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CX93011-2x CSMxx Data Sheet Package Dimensions
Figure 7. Package Dimensions for 20-Pin QFN, Sawn Style
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Package Dimensions CX93011-2x CSMxx Data Sheet
The CX20548 comes in a 16-pin QFN package, in either punch or sawn style. Both are
electrically equivalent and share the same footprint. Table 18 provides a dimension
table that is common to both QFN styles. The punch-style package is shown in
Figure 8, and the sawn-style package is shown in Figure 9.
Table 18. Package Dimensions for 16-Pin Punch and Sawn Styles
Dim. Minimum Nominal Maximum Note
e 0.65 BSC
L0.5 0.75
b0.21 0.35
(1)
D2 1.95 2.10 2.25
E2 1.95 2.10 2.25
A0.8 1.00
A1 0.00 0.05
A3 0.20 REF.
D 4.00 BSC
D1 3.75 BSC (2)
E 4.00 BSC
E1 3.75 BSC (2)
GENERAL NOTES:
1. All dimensions in mm.
2. Shape of Pin #1 indicator on the bottom of package can be different (i.e., Chamfer or
Half Circle)
FOOTNOTES:
(1) Dimension b applies to plated terminal and is measured between 0.20 and 0.30 mm
from terminal tip.
(2) This dimension is applied only for Punched QFN..
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CX93011-2x CSMxx Data Sheet Package Dimensions
Figure 8. Package Dimensions for 16-Pin QFN, Punch Style
A1
NOTE 1
SCALE: NONE
SECTION "C-C"
b
TERMINAL TIP
e
TOP VIEW
D1
3
Pin 1
Identifier
1
2
16
E
E1
D
BOTTOM VIEW
PLANE
SEATING
b
A3
A1
A
L
e
3
E2
2
D2
1
16 Pin 1
Identifier
SIDE VIEW
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Package Dimensions CX93011-2x CSMxx Data Sheet
Figure 9. Package Dimensions for 16-Pin QFN, Sawn Style
16
b
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5Recommended QFN Surface Mount
Land Patterns
The recommended surface mount land patterns based on the IPC-SM-782 standard
for board layout are shown in Figure 10 for the 20-pin QFN and Figure 11 for the 16-
pin QFN.
Figure 10. Recommended Surface Mount Land Pattern for 20-Pin QFN
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Recommended QFN Surface Mount Land Patterns CX93011-2x CSMxx Data Sheet
Figure 11. Recommended Surface Mount Land Pattern for 16-Pin QFN
