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PDF RC224ATL Data sheet ( Hoja de datos )
| Número de pieza | RC224ATL | |
| Descripción | EmbeddedModem Family | |
| Fabricantes | ETC | |
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RC224ATL/224ATLV
EmbeddedModem Family
The new Conexant RC224ATL utilizes a new integrated data pump/controller to allow
the device to directly connect to host processors that are 3.3 V I/O capable. The codec
used in the new part is the same as the codec used in the existing RC224ATL. The
new device is form, fit, and function compatible with the existing device. This means
there are no hardware and software differences between the existing and the new part,
with one exception. The 3.3 V I/O capable part incorporates 3.3 V compatible digital
I/O buffers, hence requiring 3.3 V digital supply instead of 5 V digital supply.
In addition, unlike the current version of RC224ATL, the new part provides both
data and fax capabilities.
Data modes, controlled by an industry standard 2400 AT command set, can
transmit and receive up to 2400 bps.
Fax modes, controlled by a built-in EIA-578 Class 1 command interface, provide
Group 3 transmit and receive functions.
Functional Block Diagram
Modem
Data Pump
V.24
EIA-232-D
Interface
Modem
Controller
Crystal
Telephone
Line
Interface
Modem
LED
Indictors
Optional
NVRAM
Optional
Speaker
Distinguishing Features
• Data modes
– CCITT V.22 bis (2400 bps), V.22
(1200 bps)
– Bell 212A (1200 bps) and 103
(300 bps)
– Enhanced AT commands
• Group 3 fax modes
– V.29 (9600/7200 bps) transmit
– V.27 ter (4800/2400 bps)
transmit and receive
– V.21 Channel 2 (300 bps)
transmit and receive
• EIA-578 Service Class 1 commands
• V.42/MNP2-4 and V.42 bis/MNP 5
can be supported through host
software without additional hardware
• Data/fax discriminator and auto
answering
• Communications software
compatible
• Integrated call progress and dialing
• No external microcomputer or
memory required
• Parallel or serial asynchronous DTE
interface
• A/A1 relay control
• NVRAM interface allows storage of
two user configurations and four
36-digit dial strings
• Automatic adaptive/fixed
compromise equalization
• Programmable sleep mode and
wake-up
• Full-duplex data mode test
capabilities: Analog loop, local digital
loop, and remote digital loop
• Half-duplex fax mode test capabilities
• Automatic format/speed sensing
• Low power consumption (typical)
– Operating: 100 mW
– Sleep—Idle: 25 mW
– Sleep—Stop: 5 mW
• Single +5 V power supply or Dual
+ 3.3 VDD and + 5 VAA power
supplies
• Package options:
– 68-pin plastic leaded chip carrier
(PLCC)
– 100-pin plastic quad flat pack
(PQFP)
Data Sheet
D224ATLVDSC
March 25, 1999
1 page  
RC224ATL/224ATLV
EmbeddedModem Family
List of Figures
List of Figures
Figure 2-1.
Figure 2-2.
Figure 3-1.
Figure 3-2.
Figure 3-3.
Figure 3-4.
Figure 3-5.
Figure 7-1.
Figure 7-2.
Figure 7-3.
Figure A-1.
Figure A-2.
Figure A-3.
Figure A-4.
RC224ATLV Signals—Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
RC224ATLV Signals—Serial Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
68-Pin PLCC Package—Serial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
68-Pin PLCC Package—Parallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
100-Pin PQFP Package—Serial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
100-Pin PQFP Package—Parallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
NVRAM Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
68-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
100-Pin PQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Serial Interface Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Serial Interface Design DAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Parallel Interface Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Parallel Interface Design DAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
D224ATLVDSC
Conexant
v
5 Page 
RC224ATL/224ATLV
EmbeddedModem Family
1.0 Functional Description
1.2 Technical Specifications
1.2.3 Operation
1.2.3.1 Data Modes
Modem operation is controlled by AT commands, fax service class 1 commands,
and supporting S registers.
Data rate selection is determined by the speed of the originating and answering
modems, as defined in Table 1-2.
Table 1-2. Data Rates vs. Connection Modem Rate
Originate Modem Rate
(bps)
Connect Speed Based on Answer Modem Rate (bps)
300
1200
2400
300
1200
2400
300 300 300
300
1200
1200
300
1200
2400
1.2.3.2 Fax Modes
Fax modes are negotiated as defined in T.30 and are implemented by AT+F
commands. The AT+FCLASS=1 command causes entry into the fax mode from
the data mode. Most other fax class 1 commands, which start with the AT+F
prefix, are valid only in the fax mode. All data commands are valid in the fax
mode except A/, On, &Tn, and the escape sequence (+++). The AT+FCLASS=0
command terminates the fax mode and causes entry into the data mode.
1.2.4 Data/Fax Auto Answering
The modem can automatically determine if the incoming call is from a data or fax
modem, make the appropriate connection, and inform the DTE of the connection
type.
1.2.5 Data Modulation
The data modulation conforms to V.29, V.27 ter, V.22 bis, V.22, V.21, Bell 212A,
or Bell 103, depending on the selected configuration. Transmitter and receiver
spectrum shaping is provided in accordance with the applicable standard.
1.2.6 Equalization
Automatic adaptive equalization and fixed compromised equalization are
provided to compensate for line distortions and to minimize the effects of
intersymbol interference.
1.2.7 Scrambler/Descrambler
The modem incorporates a self-synchronizing scrambler/descrambler, which
satisfies the applicable CCITT or Bell requirements.
D224ATLVDSC
Conexant
1-3
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RC224ATL.PDF ] | |
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