Si2456/Si2433/Si2414
V.90, V. 34, V. 32
B I S
I S O
M O D E M
™
Features
Data modem formats
ITU-T, Bell
300 bps up to 56 kbps
V.42, V.42bis, MNP2-5
Automatic rate negotiation
WITH
I
N T E G R A T E D
G
L O B A L
DAA
Integrated DAA
Capacitive isolation
Parallel phone detect
Globally-compliant line interface
Overcurrent detection
Caller ID decode
3.3 V power
No external ROM or RAM required
UART with flow control
AT command set support
Fast connect
Parallel interface
Call progress support
Firmware upgradeable
Ordering Information
This data sheet is valid only for
those chipset combinations listed
on page 81.
Applications
Set-top boxes
Email terminals
Point-of-sale terminals
PVRs
Security systems
Remote monitoring
Pin Assignments
Si2456/33/14
CLKIN/XTALI
XTALO
CLKOUT/A0
D6
VD3.3
GND
VDA
RTS/D7
RXD/RD
TXD/WR
CTS/CS
RESET
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
D5
DCD/D4
ESC/D3
C1A
ISOB
VD3.3
GND
VDB
D2
RI/D1
INT/D0
AOUT/INT
Description
The Si2456 is a complete, ITU-V.90-compliant, 56 kbps modem chipset
with integrated direct access arrangement (DAA) that provides a
programmable line interface to meet global telephone line requirements
with a single design. Available in two small packages, it eliminates the
need for a separate DSP data pump, external RAM and ROM, modem
controller, analog front end (AFE), isolation transformer, relays, opto-
isolators, and 2- to 4-wire hybrid. The ISOmodem™ is ideal for embedded
modem applications due to its small board space, low power
consumption, and global compliance. The Si2433 and Si2414 products
offer all the same features as the Si2456 with connect rates of up to
33.6 kbps and 14.4 kbps, respectively.
Functional Block Diagram
QE2
DCT
CLKIN/XTALI
CLKOUT
RXD
TXD
CTS
RTS
DCD
ESC
RI
INT
CS
WR
RD
A0
D0-D7
RESET
PLL
Clocking
XTALO
Si3015
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FILT2
FILT
RX
REXT
REXT2
REF
VREG2
VREG
IGND
RAM
Data Bus
C1B
RNG1
RNG2
QB
DAA
Interface
Si3015
C1A
Serial
Interface
QE
To Phone
Line
Microcontroller
DSP
AOUT
Parallel
Interface
ISOB
Patents pending
Rev. 0.9 9/02
Copyright © 2002 by Silicon Laboratories
Si2456/Si2433/Si2414-DS09
Si2456/Si2433/Si2414
2
Rev. 0.9
Si2456/Si2433/Si2414
T
A B L E O F
C
O N T E N TS
Section
Page
4
11
12
14
18
19
19
19
19
20
20
23
24
28
36
36
36
36
36
36
37
37
39
39
39
41
43
49
65
67
72
73
76
77
79
81
82
83
84
86
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bill of Materials: Si2456/33/14 Chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fast Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clocking/Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extended AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Caller ID Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UK Caller ID Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Japan Caller ID Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Force Caller ID Monitor (Always On) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Phone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overcurrent Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Global Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User-Access Registers (U-Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bit-Mapped U-Register Detail (defaults in bold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Interface Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A—DAA Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B—UL1950 3rd Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C—User-Access Register Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D—Typical Modem Applications Examples . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions: Si2456/33/14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions: Si3015 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package Outline: TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package Outline: SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rev. 0.9
3
Si2456/Si2433/Si2414
Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
1
Ambient Temperature
Si2456/33/14 Supply Voltage, Digital
3
Symbol
T
A
V
D
Test Condition
K-Grade
Min
2
0
3.0
Typ
25
3.3
Max
2
70
3.6
Unit
°C
V
Notes:
1.
The Si2456/33/14 specifications are guaranteed when the typical application circuit (including component tolerance)
and any Si2456/33/14 and any Si3015 are used. See page 11 for typical application circuit.
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, V
D
, operates from 3.0 to 3.6 V. The Si2456/33/14 interface supports 5 V logic (CLKIN/XTALI
supports 3.3 V logic only).
4
Rev. 0.9
Si2456/Si2433/Si2414
Table 2. DAA Loop Characteristics
(V
D
= 3.0 to 3.6 V, T
A
= 0 to 70 °C for K-Grade
)
Parameter
DC Termination Voltage
DC Termination Voltage
DC Termination Voltage
DC Termination Voltage
DC Termination Voltage
DC Termination Voltage
DC Termination Voltage
DC Termination Voltage
On-Hook Leakage Current
Operating Loop Current
Operating Loop Current
DC Ring Current
2
Ring Detect Voltage
3
Ring Detect Voltage
3
Ring Frequency
Ringer Equivalence Number
4
Symbol
V
TR
V
TR
V
TR
V
TR
V
TR
V
TR
V
TR
V
TR
I
LK
I
LP
I
LP
Test Condition
I
L
= 20 mA, ACT
1
= 1
DCT = 11 (CTR21)
I
L
= 42 mA, ACT = 1
DCT = 11 (CTR21)
I
L
= 50 mA, ACT = 1
DCT = 11 (CTR21)
I
L
= 60 mA, ACT = 1
DCT = 11 (CTR21)
I
L
= 20 mA, ACT = 0
DCT = 01 (Japan)
I
L
= 100 mA, ACT = 0
DCT = 01 (Japan)
I
L
= 20 mA, ACT = 0
DCT = 10 (FCC)
I
L
= 100 mA, ACT = 0
DCT = 10 (FCC)
V
TR
= –48 V
FCC/Japan Modes
CTR21
DC flowing through
ring detection circuitry
Min
—
—
—
40
—
9
—
9
—
13
13
—
11
17
15
—
Typ
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Max
7.5
14.5
40
—
6.0
—
7.5
—
7
120
60
7
22
33
68
0.2
Unit
V
V
V
V
V
V
V
V
µA
mA
mA
µA
V
rms
V
rms
Hz
V
RD
V
RD
F
R
REN
RT = 0
RT = 1
Notes:
1.
ACT = U67, bit 5; DCT = U67, bits 3:2; RT = U67, bit 0; RZ = U67, bit 1.
2.
R25 and R26 installed.
3.
The ring signal is guaranteed to not be detected below the minimum. The ring signal is guaranteed to be detected
above the maximum.
4.
C15, R14, Z2, and Z3 not installed. RZ = 0.
Rev. 0.9
5
