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| 型号： | SI2457-D-GT |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 9/60页 |
| 文件大小： | 0K |
| 描述： | IC ISOMODEM GLOBAL DAA 24TSSOP |
| 标准包装： | 62 |
| 系列： | * |
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Si2457/34/15/04
Rev. 1.3
17
4. Functional Description
Figure 8. Functional Block Diagram
The
Si2457/34/15/04
ISOmodem
is
a
complete
embedded modem chipset with integrated direct access
arrangement (DAA) that provides a programmable line
interface to meet global telephone line requirements.
Available in two small packages, this solution includes a
DSP data pump, modem controller, on-chip RAM and
ROM, codec, DAA, analog output, and 27 MHz clock
input.
The Si2457/34/15/04 accepts standard modem AT
commands and provides connect rates up to 56/33.6/
14.4/2.4 kbps full-duplex over the Public Switched
Telephone
Network
(PSTN).
The
Si2457/34/15/04
features a complete set of modem protocols including all
ITU-T standard formats up to V.90.
To provide the most flexibility, the Si2457/34/15/04
ISOmodem system-side device is offered in either a 24-
pin TSSOP or a 16-pin SOIC package. The 16-pin
version
is
footprint-compatible
with
the
Si2401
ISOmodem and is recommended for most applications.
The 16-pin version does not support the parallel,
EEPROM or voice codec interface. If these features are
required, customers should use the 24-pin version.
The ISOmodem provides numerous additional features
for embedded modem applications. The modem includes
full type I and type II caller ID detection and decoding for
global standards. Call progress monitoring is supported
through standard result codes. The modem is also
programmable to meet global settings. Because the
Si2457/34/15/04 ISOmodem integrates the DAA, analog
features, such as parallel phone detect, overcurrent
detection, and global PTT compliance with a single
design, are included.
This device is ideal for embedded modem applications
due to its small board space, low power consumption,
and global compliance. The Si2457/34/15/04 solution
includes a silicon DAA using Silicon Laboratories’
proprietary third-generation DAA technology. This highly-
integrated DAA can be programmed to meet worldwide
PTT specifications for ac termination, dc termination,
ringer impedance, and ringer threshold. In addition, the
Si2457/34/15/04 has been designed to meet the most
stringent worldwide requirements for out-of-band energy,
billing-tone
immunity,
surge
immunity,
and
safety
requirements.
The Si2457/34/15/04 allows for rapid integration into
existing modem applications by providing a serial
interface that can directly communicate to either a
microcontroller via a UART interface or a PC via an RS-
232 port. This interface allows for PC evaluation of the
modem
immediately
upon
powerup
via
the
AT
commands using standard terminal software.
4.1. Host Interface
The Si2457/34/15/04 interfaces to the host processor
through either an asynchronous serial interface, a
synchronous Serial Peripheral Interface (SPI), or a
parallel interface.
The default is asynchronous serial
communication. Selection of either SPI or parallel
interface is done on power-up with reset strapping.
Please refer to “AN93: ISOmodem Chipset Family
Designer's Guide” for details.
4.1.1. Asynchronous Serial Interface
The Si2457/34/15/04 supports asynchronous serial
communication with data terminal equipment (DTE) at
rates up to 307.2 kbps with the standard serial UART
format. Upon powerup, the UART baud rate is
automatically detected using the autobaud feature.
4.1.2. Serial Peripheral Interface (SPI)
The serial peripheral interface (SPI) provides a flexible,
full-duplex synchronous serial bus for host processor
and Si2457/34/15/04 ISOmodem communication. When
the Si2457/34/15/04 is powered up with SPI mode
enabled the modem becomes an SPI slave, and the
pins are configured to SS (slave select input, active
low), MOSI (serial data input to modem), MISO (serial
data output from modem) and SCLK (serial data clock
input).
Each SPI operation consists of a control-and-
address byte and a data byte.
4.1.3. Parallel Interface (24-Pin Version Only)
The Si2457/34/15/04 can also communicate via a
parallel interface when using the 24-pin version. The
parallel interface is an 8-bit data bus with a single bit
address to memory mapped registers.
UART
Interface
Parallel
Interface
DS
P
DAA
Interface
PLL
Clocking
XTI
XTO
CLKOUT
C1
To Phone
Line
AOUT
Data Bus
Co
nt
ro
lle
r
Si
30
18
/1
0
RXD
TXD
CTS
RTS
DCD
ESC
RI
CS
WR
RD
A0
D0-D7
Program Bus
EEPROM
Interface
EESD
EECLK
EECS
C2
SPI
Interface
MISO
MOSI
SCLK
INT
RESET
ROM
RAM
SS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI2457-D-GTR | 制造商:Silicon Laboratories Inc 功能描述:56 KBPS, V.90 ISOMODEM SYSTEM- 制造商:Silicon Laboratories Inc 功能描述:56 KBPS, V.90 ISOMODEM SYSTEM-SIDE - LEAD-FREE - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC ISOMODEM GLOBAL DAA 24TSSOP 制造商:Silicon Laboratories Inc 功能描述:56 kbps V90 ISOmodem System-Side PBF |
| Si2457FS08-EVB | 功能描述:网络开发工具 16-pin Si2457+Si3008 ISOmodem Eval Board RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
| Si2457FS18-EVB | 功能描述:网络开发工具 16-pin Si2457+Si3018 ISOmodem Eval Board RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
| SI2457-FT | 功能描述:电信线路管理 IC CONTACT SILICON LABS FOR AVAILABILITY RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| Si2457FT08-EVB | 功能描述:网络开发工具 24-pin Si2457+Si3008 ISOmodem Eval Board RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
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