CONEXANT CX86500

SCXV.92/V.34/V.32bis Modem
Controller-based Modem with Worldwide SmartDAA 3 Line Side
Device for Embedded Applications
Overview
Applications
The Conexant SCXV.92, SCXV.34, and SCXV.32bis modems are worldwide operational
modem device sets for embedded applications that support modulations up to V.92,
V.34, and V.32bis, respectively. All modems also support V.44/V.42bis/MNP 5 data
compression for greater data throughput, V.42 LAPM/MNP2-4 error correction protocol
for increased data integrity and reliability.
The SCXV.92/V.34/V.32bis device set consists of a modem device and a SmartDAA 3
Line Side Device (LSD). The modem device integrates a microcontroller (MCU), a digital
signal processor (DSP), and a SmartDAA system side device (SSD) onto a single die
(Figure 1). The modem is available in 28-pin or 38-pin TSSOP versions. The 28-pin
version is for serial interface applications (Figure 2) and is footprint-compatible with the
CX84100 (SCXV.22bis) and CX81801-9x (SmartV.XX) modem devices. The 38-pin
version is for serial (Figure 3) or parallel (Figure 4) interface applications (interface type
selectable by an I/O pin). Major hardware interfaces are illustrated in Figure 1.
Conexant’s SmartDAA technology used in the SmartDAA 3 LSD eliminates the need for
bulky analog transformers, relays, and opto-isolators typically used in discrete DAA
implementations. The SmartDAA 3 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 3 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. The SmartDAA 3 LSD is available in a
28-pin Quad Flat No-lead (QFN) package or in a 32-pin Low Profile Quad Pack (LQFP)
package.
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 by
the 38-pin version. 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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•
•
•
•
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Set top boxes
Point-of-Sale terminals
ATM machines
Metering terminals
Video game consoles
Internet appliances
Features
• Modulations and protocols
− ITU-T V.92
♦ Modem-on-Hold (MOH)
♦ Quick connect (QC)
♦ PCM upstream
− V.90/V.34/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
− V22bis fast connect
− V.80 Synchronous Access Mode
• Data compression
− V.44/V.42bis/MNP5
• Error correction
− V.42/MNP 4/MNP 2
• Call Waiting (CW) detection
• Type I and Type II Caller ID
(CID) decoding
• DTE/host interface
− Serial DTE interface
− Parallel 16550 UARTcompatible host interface
(38-pin version)
− Direct Mode
− Synchronous Mode
− Asynchronous Mode
(Continued on Page 2)
Product Preview
Conexant
Doc. No. 102235C
February 19, 2004
SCXV.92/V.34/V.32bis Modem Product Preview
Features (Continued)
• No external memory required
• Embedded and upgradeable country profiles
• Serial NVRAM interface for optional permanent country
profile storage (38-pin version)
• Embedded AT commands
• Full-duplex 8-bit/14-bit PCM voice pass-through mode
• 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 5KV isolation
Figure 1. SCXV.92/V.34/V.32bis Modem Simplified Interface
V.92/V.34/V.32bis Modem
28-Pin or 38-Pin TSSOP
Serial or
Parallel*
Interface
28.224 MHz
or
27.000 MHz
Clock Source
DTE/Host
Interface
RAM
MCU/DSP/
SmartDAA
Interface
Digital Isolation
Barrier (DIB)
Components
DAA Hardware
CX20493
SmartDAA 3
Line Side Device (LSD)
28-Pin QFN or 32-Pin LQFP
Line Side
DIB
Interface
(LSDI)
Codec
Telephone
Line
Interface
External
Discrete
Components
Telephone
Line
TIP
RING
ROM
Optional
NVRAM*
* 38-pin version only.
102387_001
2
Conexant
102235C
SCXV.92/V.34/V.32bis Modem Product Preview
Figure 2. CX86500 Modem 28-Pin TSSOP with Serial Interface Hardware Signals
CRYSTAL CIRCUIT SOURCE
1
2
1M
XTLI
XTLO
33
28.224 MHZ
CRYSTAL
33 pF
33 pF
PWRCLKP
PWRCLKN
DIB_DATAP
DIB_DATAN
ALTERNATIVE CLOCK SOURCE
28.224 MHZ OR 27.000 MHZ
CLOCK OSCILLATOR
NC
1
2
5
4
11
18
12
10
6
8
17
SERIAL HOST
INTERFACE
15
FREQUENCY SELECT
CIRCUIT
3
RESET CIRCUIT
240K
+3.3V
23
CX86500
Modem
XTLI
XTLO
DSPKOUT
VDD_CORE
28-Pin TSSOP
Serial
Interface
TXD#
RXD#
CTS#
RI#
DTR#
RTS#
RXCLK#
TXCLK#
RLSD#
VDD
VDD
GND
GND
RESERVED
RESERVED
RESERVED
RESERVED
26
27
20
21
28
DIGITAL ISOLATION
BARRIER (DIB)
SPEAKER CIRCUIT
24
7
22
+3.3V
9
25
13
14
16
19
SCLKSEL#
RESET#
LPO
102287_002
102235C
Conexant
3
SCXV.92/V.34/V.32bis Modem Product Preview
Figure 3. CX86500 Modem 38-Pin TSSOP with Serial Interface Hardware Signals
CRYSTAL CIRCUIT SOURCE
3
4
1M
XTLI
XTLO
33
28.224 MHZ
CRYSTAL
33 pF
PWRCLKP
PWRCLKN
DIB_DATAP
DIB_DATAN
33 pF
DSPKOUT
NVMDATA
NVMCLK/PARIF
ALTERNATIVE CLOCK SOURCE
28.224 MHZ OR 27.000 MHZ
CLOCK OSCILLATOR
NC
3
4
7
6
16
23
17
15
27
8
12
22
SERIAL HOST
INTERFACE
FREQUENCY SELECT
CIRCUIT
20
5
RESET CIRCUIT
240K
+3.3V
31
34
35
25
26
DIGITAL ISOLATION
BARRIER (DIB)
36
SPEAKER CIRCUIT
29
13
SERIAL EEPROM
10K
XTLI
XTLO
CX86500
Modem
VDD_CORE
38-Pin TSSOP
Serial
Interface
TXD#
RXD#
CTS#
RI#
DTR#
RTS#
DSR#
RXCLK#
TXCLK#
RLSD#/CLKSEL#
VDD
VDD
VDD
GND
GND
GND
GND
NC
NC
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
SCLKSEL#
RESET#
LPO
32
9
10
30
+3.3V
1
14
33
38
2
37
NC
11
18
19
21
28
24
102287_004
4
Conexant
102235C
SCXV.92/V.34/V.32bis Modem Product Preview
Figure 4. CX86500 Modem 38-Pin TSSOP with Parallel Interface Hardware Signals
CRYSTAL CIRCUIT SOURCE
3
4
1M
XTLI
XTLO
33
28.224 MHZ
CRYSTAL
33 pF
PWRCLKP
PWRCLKN
DIB_DATAP
DIB_DATAN
33 pF
DSPKOUT
NVMDATA
NVMCLK/PARIF
ALTERNATIVE CLOCK SOURCE
28.224 MHZ OR 27.000 MHZ
CLOCK OSCILLATOR
NC
6
7
8
12
15
16
17
22
23
27
28
18
21
20
19
PARALLEL HOST
INTERFACE
FREQUENCY SELECT
CIRCUIT
11
5
RESET CIRCUIT
240K
+3.3V
3
4
31
DIGITAL ISOLATION
BARRIER (DIB)
36
SPEAKER CIRCUIT
29
13
SERIAL EEPROM
CX86500
Modem
XTLI
XTLO
HA0
HA1
HA2
HD0
HD1
HD2
HD3
HD4
HD5
HD6
HD7
HCS#
HRD#
HWT#
HINT
34
35
25
26
38-Pin TSSOPVDD_CORE
Parallel
VDD
Interface
VDD
VDD
GND
GND
GND
GND
NC
NC
RESERVED
PCLKSEL#
32
9
10
30
+3.3V
1
14
33
38
2
37
NC
24
RESET#
LPO
102287_006
102235C
Conexant
5
 2003, 2004 Conexant Systems, Inc.
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