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SmartACFLModem
V.90/K56flex/V.34/V.32bis Modem Device Sets with Microcontroller (L2702),
Modem Data Pump (P9373), SmartDAA(20463), and Optional Voice Codec (20437)
for Low Power Applications
The ConexantSmartACFL V.90/K56flex Modem Device Set with SmartDAA
technology supports analog data up to 56 Kbps, analog fax to 14.4 Kbps,
telephone answering machine (TAM), V.80 synchronous access mode, on-
board DSVD, voice/speakerphone (optional), and cellular/GSM operation.
Serial, parallel, or PC Card host interface operation is supported depending on
the selected model (Table 1).
The modem supports ITU-T V.90/K56flex, V.34 and V.32bis data
modulations and is designed to operate with dial-up telephone lines in the U.S.
and worldwide. PC Card and parallel host interface models also support analog
cellular direct connect and GSM direct connect. Low profile, small TQFP
packages and low voltage operation with low power consumption make this
device set ideal for laptop, notebook, and palmtop applications using the
parallel host or serial DTE interface with the MCU, or the PC Card interface
with the MCUP.
The SmartACFL device set consists of a Microcontroller (MCU or MCUP) in a
128-pin TQFP, a Modem Data Pump (MDP) in a 100-pin TQFP, and a Line
Side Device (LSD) (SmartDAA device) in a 32-pin TQFP. The optional Voice
Codec (VC), in a 32-pin TQFP, supports voice/full-duplex speakerphone
(FDSP) operation with interfaces to a microphone and speaker and to a
telephone handset/headset. Figure 1 identifies the major hardware signal
interfaces. The MCUP supports two peripheral channels, one channel for the
modem and a second channel for an optional user-defined function
(Function 2).
Conexant's SmartDAA technology (patent pending) eliminates the need for a
costly line transformer, relays, and opto-isolators typically used in discrete DAA
(Data Access Arrangement) implementations. The SmartDAA architecture also
simplifies product implementation by eliminating the need for country-specific
components enabling worldwide homologation of a single modem board design
and a single bill of materials (BOM).
The SmartDAA system-powered DAA operates reliably without drawing power
from the line, unlike line-powered DAAs that operate poorly when line current is
insufficient due to long lines or poor line conditions. Enhanced features, such
as monitoring of local extension status without going off-hook, are also
supported.
Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design
(patent pending) and other innovative DAA features, the SmartDAA
architecture simplifies application design, minimizes layout area, and reduces
component cost.
Features
V.90 data/V.17 fax modem
SmartDAA technology
System side powered DAA operates
under poor line current supply
conditions
Wake-on-ring
Ring detection
Line polarity reversal detection
Line current loss detection
Pulse dialing
Call waiting detection
Digital PBX line protection
Meets world-wide DC VI Masks
requirements
Caller ID detection
Data/Fax/Voice call discrimination
Hardware-based modem controller
Hardware-based digital signal
processor (DSP)
Voice/full-duplex speakerphone mode
(S models)
V.70 DSVD using optional RCDSVD
SCP (S models)
World-wide operation
Industry standard communication
commands
Selectable parallel/serial interface with
speeds up to 230.4 kbps
Parallel 16550A UART-compatible
interface
Serial ITU-T V.24 (EIA/TIA-232-E)
V.80 synchronous access mode
Direct mode (serial interface)
Synchronous data mode
(serial interface)
V.22 bis fast connect
Analog cellular direct connect
GSM direct connect
Sleep mode
Thin packages support low profile
designs
+3.3V operation with +5V tolerant
digital inputs
Data Sheet (Preliminary)
Conexant Proprietary Information
Doc. No.100444A
December 21, 1999

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SmartACFL
V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications
Table 1. SmartACFL Modem Models and Functions
Model/Order/Part Numbers
Supported Functions
Marketing Name
Device Set
Order No.
MCU
[128-Pin
TQFP]
Part No.
MDP
[100-Pin
TQFP]
Part No.
LSD
[32-Pin
TQFP]
Part No.
Optional
Voice Codec
(VC)
[32-Pin TQFP]
Part No.
V.90/K56fle
x Data
V.34
Data
V.32 bis
Data,
V.17 Fax,
Fax Cl 1,
Fax Cl 2,
TAM,
W-W, V.80
SmartACFL/56S-PCC DS56-L492-001
SmartACFL/56-PCC DS56-L492-011
SmartACFL/56S
DS56-L492-021
SmartACFL/56
DS56-L492-031
L2702-12
L2702-12
L2702-15
L2702-15
P9373-11
P9373-11
P9373-11
P9373-11
20463-11
20463-11
20463-11
20463-11
20437-11
20437-11
YY
YY
YY
YY
Y
Y
Y
Y
Notes:
1. Model options:
S
PCC
56
33
14
Voice and speakerphone
PC Card host interface (serial DTE/parallel host if not PCC)
56 kbps max. rate per V.90
33.6 kbps max. rate per V.34
14.4 kbps max. rate per V.32bis
Voice/
FDSP
Y
Y
2. Supported functions (Y = Supported; — = Not supported):
TAM
Telephone answering machine support (handset support requires S model)
Fax Cl 1 and Cl 2
Fax Class 1 and Fax Class 2 support
FDSP
Full-duplex speakerphone
Revision History
Revision
A
Date
12/21/99
Initial public release of document
Comments
Copyright © Conexant Systems, Inc., 1999. 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 specifications and product descriptions at any time, without notice. Conexant
makes no commitment to update the information contained herein. Conexant shall have no responsibility whatsoever for conflicts or
incompatibilities arising from future changes to its specifications and product descriptions.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in
Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO
SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A
PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL
PROPERTY RIGHT. Conexant further does not warrant the accuracy or completeness of the information, text, graphics or other items
contained within these materials. Conexant shall not be liable for any special, indirect, incidental, or consequential damages, including without
limitation, lost revenues or lost profits, which may result from the use of these materials.
Conexant products are not intended for use in medical, life saving or life sustaining applications. Conexant customers using or selling
Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from
such improper use or sale.
The following are trademarks of Conexant Systems, Inc.: Conexant, the Conexant C symbol, “What’s Next in Communications Technologies”,
SmartDAA, SmartHSF, and SmartACFL. Product names or services listed in this publication are for identification purposes only, and may be
trademarks of third parties. Third-party brands and names are the property of their respective owners.
Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send
comments and suggestions to conexant.tech.pubs@conexant.com. For technical questions, contact your local Conexant
sales office or field applications engineer.
2
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Doc. No. 100444A
Proprietary Information

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V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications
SmartACFL
Introduction (continued)
Applications
The optional Voice Codec (VC) supports voice/full-
duplex speakerphone (FDSP) operation with
interfaces to a microphone and speaker and to a
telephone handset/headset. The optional RCDSVD
Speech Codec Processor (SCP) supports DSVD.
The modem operates by executing firmware from
external 1 Mbit (128k X 8) RAM and 2 Mbit (256k X
8) ROM/Flash ROM. The 33S and 14S models can
alternatively use external 1 Mbit or 2 Mbit
ROM/Flash ROM and the MCU’s internal 32K X 8
RAM. For GSM support the ROM size is doubled.
PC Cards
Embedded systems
Serial box modems
Set top boxes
Point of sales terminals
Remote monitoring and data collection systems
Accelerator kits and reference designs are available
in electronic form to minimize application design time
and costs. The design package includes schematics,
bill of materials (BOM), board layout files in Gerber
format, and complete documentation. The design is
pretested to pass FCC Part 15, Part 68, and CTR 21
for immediate manufacturing.
Microcontroller Unit (MCU)
L2702: 128-Pin TQFP
Central
Processor
Unit (MCU)
MDP
Interface
PCCard/Parallel/
Serial DTE
Interface
Host
Interface
Internal
RAM
Cellular and
GSM
Interface
Serial
EEPROM
Interface
Modem Data Pump (MDP)
P9373: 100-Pin TQFP
SmartDAA
Interface
Digital
Isolation
Barrier
(DIB)
(OEM
supplied)
Rectifier and
Filter
Components
DAA Hardware
Line Side Device (LSD)
20463: 32-Pin TQFP
Line
Side
DIB
Interface
(LSDI)
Codec
Telephone
Line
Interface
Electronic
Inductor,
Diode Bridge,
Protection &
EMI,
Impedance
Components
Telephone
Line
TIP
RING
MCU
Interface
Modem
Data Pump
(MDP)
Voice Codec (VC)
20437: 32-Pin TQFP
(Optional)
Serial EEPROM
SPEAK2E3K2R(K25(46Kx x8)8)to
(Optional)
HS Hybrid
Components
(Optional)
S(PMEIicnA/tSKerpEfeaRackeer)
(Optional)
Digital Speaker
Circuit (Optional)
MIC
SPEAKER
Cellular
Interface
GSM
Interface
SOUNDUCER
Expansion
Memory
Bus
Interface
RAM
1M (128K x 8)
ROM/Flash ROM
2M (256K x 8)
4M (512K X 8)*
* = GSM Support
Doc. No. 100444A
Figure 1. SmartACFL Modem Major Interfaces
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SmartACFL
V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications
Detailed Features
General Modem Features
Downloadable Architecture
Downloadable MCU firmware from the host/DTE
Downloadable MDP code modules from the
MCU, transparent to the host
V.90 data modem with receive rates up to 56k bps
and send rates up to V.34 rates
ITU-T V.90, K56flex, V.34 (33.6 kbps), V.32 bis,
V.32, V.22 bis, V.22, V.23, and V.21; Bell 212A
and 103
V.42 LAPM and MNP 2-4 error correction
V.42 bis and MNP 5 data compression
MNP 10EC™ enhanced cellular performance
V.250 (ex V.25 ter) and V.251 (ex V.25 ter
Annex A) commands
V.22 bis fast connect
Analog cellular direct connect
GSM direct connect
V.17 fax modem with send and receive rates up to
14.4 kbps
ITU-T V.17, V.29, V.27 ter, and V.21 ch. 2
EIA/TIA 578 Class 1 and T.30 Class 1.0
commands
V.80 synchronous access mode supports host-
controlled communication protocols with H.324
interface support
Data/Fax/Voice call discrimination
Hardware-based modem controller
Worldwide operation
US/Japan/Canada/TBR21 and other countries
Caller ID and distinctive ring detection
Call progress, blacklisting
Telephony/TAM
V.253 commands
8-bit µ-Law/A-Law coding (G.711)
8-bit/16-bit linear coding
8 kHz sample rate
Concurrent DTMF, ring, and Caller ID detection
Full-duplex speakerphone mode (S models)
Microphone and speaker interface
Telephone handset or headset interface
Acoustic and line echo cancellation
Microphone gain and muting
Speaker volume control and muting
PC Card interface (MCUP only) supports two
functions with programmable I/O and window size
JTAG Boundary Scan support
Built-in host/DTE interface with speeds up to 230.4
kbps
Parallel 16550A UART-compatible interface
(MCU)
Serial ITU-T V.24 (EIA/TIA-232-E) (MCU)
PC Card (MCUP)
Flow control and speed buffering
Automatic format/speed sensing
Serial sync/async data; parallel async data
Sleep mode
Thin packages support low profile designs (1.6 mm
max. height)
MCU (L2702): 128-pin TQFP
MDP (P9373): 100-pin TQFP
LSD (20463): 32-pin TQFP
VC (20437): 32-pin TQFP
Description
General
The SmartACFL device set, comprised of separate
microcontroller (MCU), modem data pump (MDP),
and line side device (LSD) devices, provides the
processing core for a complete modem design. The
optional Voice Codec (VC) supports voice/full-duplex
speakerphone (FDSP) operation with interfaces to a
microphone and speaker and to a telephone
handset/headset (S models). The S model can also
be ordered with an RCDSVD Speech Codec
Processor (SCP) in a 100-pin PQFP to support
DSVD.
Modem operation, including dialing, call progress,
telephone line interface, telephone handset interface,
voice/speakerphone interface, and host interface
functions are supported and controlled through the
V.250, V.251, and V.253-compatible command set.
The modem hardware connects to the host via a
parallel, serial, or PC Card interface. The OEM adds
discrete components as required by the modem
model and the application to complete the system
(Table 1). These components may include a crystal
circuit, EEPROM, DIB components, telephone line
interface, optional voice/speakerphone interface, and
optional cellular/GSM interface.
Parallel interface operation, including cellular and
GSM support, is selected by PARIF input high. Serial
interface operation is selected by PARIF input low.
Cellular operation is selected by LINE/CELL input
low. GSM operation is selected by LINE/GSM input
low.
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V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications
SmartACFL
Data/Fax Modes
In V.90/K56flex data modem mode, the modem can
receive data from a digitally connected central site
modem (CSM) at line speeds up to 56 kbps.
Asymmetrical data transmission supports sending
data up to V.34 rates; this mode can fallback to full-
duplex V.34 mode, and to lower rates as dictated by
line conditions.
In V.34 data mode, the modem operates at line
speeds up to 33.6 kbps. Error correction (V.42/MNP
2-4) and data compression (V.42 bis/MNP 5)
maximize data transfer integrity and boost average
data throughput up to 230.4 kbps. Non-error-
correcting mode is also supported.
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.32 bis in accordance with PN2330. All tone and
pattern detection functions required by the applicable
ITU or Bell standard are supported.
In V.32 bis mode, the modem operates at line
speeds up to 14.4 kbps.
In V.22 bis fast connect mode, the modem can
connect at 2400 bps with a very short training time,
which is very efficient for small data transfers.
In fax modem mode, the modem can operate in 2-
wire, half-duplex, synchronous mode 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.30 Fax Class 1.0, or Fax
Class 2 command interface. Full HDLC formatting,
zero insertion/deletion, and CRC
generation/checking are provided. Both transmit and
receive fax data are buffered within the modem. Data
transfer to and from DTE is flow controlled by
XON/XOFF and RTS/CTS.
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.
Voice-call-first (VCF) before switching to a
videophone call is also supported.
Worldwide Operation
The modem operates in US/Japan/Canada/TBR21
and other countries. Country dependent parameters
for functions such as dialing, carrier transmit level,
calling tone, call progress tone detection, answer
tone detection, blacklisting, and relay control are
programmable by ConfigurACE II for Windows.
SmartDAA technology allows a single PCB design
and single BOM to be homologated worldwide.
Advanced features such as digital PBX protection
are also supported.
TAM Mode
TAM Mode features include 8-bit µ-Law, A-Law, and
linear coding at 8 kHz sample rate. Full-duplex voice
supports concurrent voice receive and transmit.
Tone detection and generation, call discrimination,
and concurrent DTMF detection are also supported.
ADPCM (4-bit IMA) coding is supported to meet
Microsoft WHQL logo requirements.
TAM Mode is supported by three submodes:
1. Online Voice Command Mode supports
connection to the telephone line or, for the S
model, a handset.
2. Voice Receive Mode supports recording voice or
audio data input from the telephone line or, for
the S model, a microphone/handset.
3. Voice Transmit Mode supports playback of voice
or audio data to the telephone line or, for the S
model, a speaker/handset.
Doc. No. 100444A
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