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73M2901-32IH 参数 Datasheet PDF下载

73M2901-32IH图片预览
型号: 73M2901-32IH
PDF下载: 下载PDF文件 查看货源
内容描述: 先进的单芯片调制解调器 [Advanced Single Chip Modem]
分类和应用: 调制解调器
文件页数/大小: 17 页 / 316 K
品牌: TDK [ TDK ELECTRONICS ]
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73M2901/3.3V  
Advanced Single  
Chip Modem  
FIRMWARE DESCRIPTION2  
FIRMWARE FEATURES  
An “AT” command interpreter provides command  
and configuration of the 73M2901/3.3V. This  
provides the user a uniform interface to control the  
modem in embedded applications.  
“AT” command set  
Supports data standards through V.22bis  
Provides DAA control firmware (e.g. ring detect,  
hook control, line in use detection support)  
Multinational Call progress support (FCC68,  
CTR21, JATE…)  
The signal processing is performed by obtaining  
data from and providing data to the integrated A/D  
converter. A MAC hardware processor is provided  
for computation.  
Caller ID capability  
FSK demodulation (V23 or Bell202)  
Intra 1st/2nd ring CID data operations  
Post Line reversal CID data operations  
Interfaces with standard V.24/EIA-232 (3-5 volt  
inverted level) serial interface using the built in  
serial port and firmware control of port pins  
Provides tone generation and detection, four  
imprecise and four precise call progress detect  
filters  
To provide maximum flexibility, the system host  
processor can access the internal RAM and Control  
Register space in the modem. This will allow the  
OEM user to modify parameters such as filter  
response, transmit levels through the AT command  
set using proprietary commands.  
The host  
processor can also access the modem I/O port pins,  
providing extended I/O capability.  
Host access to program RAM provided  
User access to modem functions  
FIRMWARE REQUIREMENTS  
The modem always powers up in the idle (on hook)  
mode. “AT” commands are issued via the serial  
interface from the host. All modem configuration  
commands are received in this manner. The data  
modem firmware is contained in an internal ROM.  
The firmware will automatically enter a power saving  
idle mode if the modem is on hook and there are no  
incoming host commands.  
The modem  
automatically powers up upon receiving the next  
command. This power up sequence occurs without  
delay to the host. This function, while saving power,  
is transparent to the host processor and can be  
disabled by the host via an “AT” command. The  
host can also program the modem to power down  
via external pin (DTR) or via a firmware command.  
2 For a detailed description of the firmware consult the TDK  
73M2901 User’s Manual.  
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