Si2494/39
V. 92
Features
AND
V.34 ISO
MODE M ®
WITH
G
LOBAL
DAA
Data modem formats
ITU-T, Bell
300 bps up to 56 kbps
V.21,V.22, V.29 Fast Connect
V.44, V.42, V.42bis, MNP2-5
Automatic rate negotiation
V.92 PCM upstream
V.92 Quick connect
V.92 Modem on hold
Type I and II caller ID decode
No external ROM or RAM required
UART, SPI, or parallel interface
Flexible clock options
Low-cost 32.768 kHz oscillator
4.915 MHz oscillator
27 MHz clock input
Integrated DAA
Over 6000 V capacitive isolation
Parallel phone detect
Globally-compliant line interface
Overcurrent detection
AT command set support
SMS / MMS support
Firmware upgradeable
EEPROM interface
Commercial or industrial
temperature range
DTMF detection/generation
Si3000 Voice Codec Interface
Hardware support for mic,
speaker, and/or handset
Programmable voice filters,
limiters, and sidetone
Supports TBR-38, TIA/EIA-
4790 and other voice
standards
Voice pass through with
compression
Supports telephone
answering machine, music
on hold, voice menus, etc
Full-duplex speakerphone
support
Line echo cancellation
Acoustic echo cancellation
Ordering Information
This data sheet is valid only for
those chipset combinations listed
on page 59.
Pin Assignments
CLKIN/XTALI
GPIO18, D0
GPIO17, D1
GPIO16, D2
XTALO
N/C
INT
Applications
GPIO1
1
2
3
4
5
6
7
8
9
38 37 36 35 34 33 32
31
30
29
GPIO25, D3
GPIO24, D4
ESC, D5
DCD, D6
N/C
VDD
GND
RTS, SS, D7
TXD, MOSI, WR
RXD, MISO, RD
CTS, SCLK, CS
GPIO11, A0
Point-of-sale terminals
Security
Medical
Remote monitoring
FSYNC
CLKOUT
N/C
VDD
GND
VREG
SDI
SDO
EESDI
EESDO
EECS
Si2494/39
5 x 7 mm
QFN
28
27
26
25
24
23
22
21
20
Description
The Si2494/39 ISOmodem is a full-featured ITU V.92/V.34-compliant modem that
provides connect rates of up to 56 kbps, full-duplex, over the public switched
telephone network (PSTN). Offered as a chipset with the Si2494/39 system-side
device and the Si3018 line-side device, the ISOModem utilizes Silicon
Laboratories’ patented direct access arrangment (DAA) technology to provide a
programmable telephone line interface with an unparalleled level of integration.
This compact solution eliminates the need for a separate DSP, modem controller,
codec, transformer, relay, opto-isolators, clocking crystal, and 2-4 wire hybrid. The
addition of the Si3000 voice codec supports a voice handset and/or full-duplex
speakerphone. Voice pass-through with optional compression supports tapeless
answering machine, music-on-hold, voice menus, etc. The Si2494/39 is ideal for
embedded modem applications due to its flexibility, small footprint, and minimal
external component count.
10
11
12
13 14 15 16 17 18 19
AOUT
RESET
C2A
C1A
EECLK
AOUTb
RI
Si3018
QE 1
DCT 2
RX 3
IB 4
C1B 5
C2B 6
VREG 7
RNG1 8
16 DCT2
15 IGND
14 DCT3
13
12
11
10
9
QB
QE2
SC
VREG2
RNG2
System Block Diagram
Host
CPU
Host Interface
Si2494
System
Side
Si3018
Line
Side
Global
DAA
BOM
Telco
Tip
Ring
UART
SPI
Parallel
Capacitive
Isolation Barrier
Rev. 1.0 7/11
Copyright © 2011 by Silicon Laboratories
Si2494/39
Si2494/39
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Bill of Materials: Si2494/39 Chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2. Command Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.3. Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4. Fast Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.5. V.80 Synchronous Access Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6. Voice Mode (+FCLASS=8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.7. Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8. Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.9. Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.10. Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.11. Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.12. V.92 PCM Upstream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.13. V.92 Quick Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.14. V.92 Modem-on-Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.15. Caller ID Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.16. Parallel Phone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.17. Overcurrent Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.18. Global Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.19. Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.20. DTMF Detection / Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.21. SMS/MMS Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.22. Codec Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.23. Answering Machine Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.24. Voice Pass-Through (Speakerphone) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.25. General-Purpose Tone Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.26. EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.27. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
4.28. Extended AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5. S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6. User-Access Registers (U-Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7. Pin Descriptions: Si2494/39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8. Pin Descriptions: Si3018 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
9. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10. Package Markings (Top Markings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.1. Si2494 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.2. Si2439 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.3. Si2494/39 Top Markings Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
10.4. Si3018 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
10.5. Si3018 Top Markings Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Rev. 1.0
3
Si2494/39
11. Package Outline: 38-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
12. 38-Pin QFN Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
13. Package Outline: 16-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
14. 16-Pin SOIC Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
4
Rev. 1.0
Si2494/39
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
1
Ambient Temperature
Si2494/39 Supply Voltage, Digital
3
Symbol
T
A
V
D
Test Condition
F-grade
G-grade
Min
2
0
–40
3.0
Typ
25
25
3.3
Max
2
70
85
3.6
Unit
°C
V
Notes:
1.
The Si2494/39 specifications are guaranteed when the typical application circuit (including component tolerance) and
any Si2494/39 and any Si3018 are used. See "2. Typical Application Schematic" on page 12.
2.
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at nominal supply voltages and an operating temperature of 25 °C unless otherwise stated.
3.
The digital supply, VD, operates from 3.0 to 3.6 V.
Figure 1. Test Circuit for Loop Characteristics
Table 2. DC Characteristics, V
D
= 3.0 to 3.6 V
(V
D
= 3.0 to 3.6 V, T
A
= 0 to 70 °C for F-grade, T
A
=
–40 to 85 °C for G-grade)
Parameter
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
Low Level Output Voltage
Input Leakage Current
Pullup Resistance Pins
Total Supply Current
*
Total Supply Current, Wake-On-Ring*
Total Supply Current, Powerdown
*
Symbol
V
IH
V
IL
V
OH
V
OL
I
L
R
PU
I
D
I
D
I
D
Test Condition
Min
2.0
—
Typ
—
—
—
—
—
125
17
4.4
80
Max
—
0.8
—
0.35
10
200
35
—
—
Unit
V
V
V
V
µA
k
mA
mA
µA
I
O
= –2 mA
I
O
= 2 mA
2.4
—
–10
50
—
—
PDN = 1
—
*Note:
All inputs at 0 or V
D
. All inputs held static except clock and all outputs unloaded (Static I
OUT
= 0 mA).
Rev. 1.0
5
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