Document
Si2457/Si2434/Si2415
V. 9 0 , V. 3 4 , V. 3 2 B I S I S O M O D E M ® W I T H I N T E GR A T E D G L O B A L D A A
Features
Data modem formats
ITU-T, Bell 300 bps up to 56 kbps V.21,V.22, V.29 Fast Connect V.42, V.42bis, MNP2-5 Automatic rate negotiation
Type I and II caller ID decode No external ROM or RAM required UART or parallel interface AT command set support
Applications
Set-top boxes Point-of-sale terminals ATM terminals
Integrated DAA
Over 5000 V Capacitive isolation Parallel phone detect Globally-compliant line interface Overcurrent detection
27 MHz clock input 3.3 V power Firmware upgradeable EEPROM interface
Digital video recorder Digital televisions Remote monitoring
Description
The Si2457, Si2434, and Si2415 are complete two-chip modems ranging in speed from 56,000 bps to 14,400 bps. The ISOmodem® chipsets utilize Silicon Laboratories’ third-generation direct access arrangement (DAA) to provide a globally-programmable telephone line interface with an unparalleled level of integration. By sharing the same line-side device, a single design can be used in all countries and for all modem speeds. Available in two small packages, these compact solutions eliminate the need for a separate DSP, modem controller, codec, isolation transformer, relay, opto-isolators, clocking crystal, and 2–4 wire hybrid. The ISOmodem provides conventional data formats with connect rates of up to 56,000 bps, full-duplex, over the Public Switched Telephone Network (PSTN). These devices are ideal for embedded modem applications due to their flexibility, small footprint, and minimal external component count.
Functional Block Diagram
CLKIN/XTALI
XTALO
CLKOUT
RXD TXD CTS RTS DCD ESC
RI
INT
PLL Clocking
Serial Interface
RAM/ROM Data Bus
Microcontroller DSP
CS WR RD
A0 D0-D7
RESET
Parallel Interface
DAA Interface
AOUT
To Phone Line
ISOB
Si3018
Ordering Information
This data sheet is valid only for those chipset combinations listed
on page 68.
Pin Assignments
Si2457/34/15
CLKIN/XTALI XTALO
CLKOUT/EECS/A0 FSYNC/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 SDO/EECLK/D5 23 DCD/D4 22 ESC/D3
21 VD3.3
20 GND 19 VDB 18 SDI/EESD/D2 17 RI/D1 16 INT/DO 15 AOUT/INT 14 C1A 13 C2A
Si3018
QE DCT RX
IB C1B C2B
VREG RNG1
1 2 3 4
5 6 7 8
16 DCT2 15 IGND
14 DCT3 13 QB
12 QE2 11 SC 10 VREG2
9 RNG2
U.S. Patent #5,870,046 U.S. Patent #6,061,009 Other patents pending
Preliminary Rev. 0.91 5/04
Copyright © 2004 by Silicon Laboratories
Si2457/Si2434/Si2415
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Si2457/Si2434/Si2415
2 Rev. 0.91
TABLE OF CONTENTS
Si2457/Si2434/Si2415
Section
Page
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..