Datasheet > M48A

M48A

更新时间： 2024-09-25 05:46:51

品牌	Logo	应用领域
RADIOMETRIX		调制解调器无线
页数	文件大小	规格书
9页	146K
描述
M48A modem chip - for narrow band wireless data link

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中文翻译

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数据手册

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M48A 数据手册

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England

Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com

PRELIMINARY

07 September 2009

M48A MODEM

M48A modem chip – for narrow band wireless data link

The M48A is a half-duplex serial modem

controller suitable for use with narrow band

receivers, transmitters and transceivers. It

supports a maximum transparent data

throughput of 4800baud while baseband

modulation frequencies do not exceed 3.2KHz.

The device supports (programmable) long

startup/preamble durations sometimes

required for synthesized narrow band devices.

Figure 1: M48A-000-DIL modem IC

The M48 provides a half duplex link, but provided no two devices attempt to transmit at one time (a 'low' on

RX_flow may be used as a primitive 'CTS' indication) no further restrictions on data transmission need be

made, as all transmit timing, valid data identification and data stream buffering is conducted by the device.

This unit supports a range of user interface data rates, in asynchronous data format: 1 start bit, 8 data bits, 1

stop bit. The supplied default (and the maximum transparent throughput) is 4800 baud

To connect to a true RS232 device, inverting level shifters must be used (MAX232 type are ideal, but simple

NPN transistor switches often suffice). With typical microcontrollers and uarts, direct connection is usable.

Note that TXD has no internal pullup.

Features

ꢀ

Operating voltage (temperature):

5V for standard version (-40°C to +85°C)

ꢀ

Maximum usage of the range capability of an RF module

Compatible with fast or slow transmitter power up timing requirements

5kbps pulse duration coded protocol

Synchronisation codes and checksum to reduce false triggering on noise

Programmable transmit address and four receive addresses

Programmable timing parameters (preamble length, etc)

Programmable auxiliary serial output (to program radio modules)

Programmable serial modem baud rate (1200 - 76800 bps, half-duplex)

Suitable to be used with Narrow Band FM radio modules

Addressable point-to-point and point to multi point

Packet acknowledge/resend (ACK) mode

Store and forward repeater function

Applications

ꢀ

PDAs, organisers & laptops

Handheld / portable terminals

Remote operated vehicles

Data loggers

In-building environmental monitoring and control

Industrial (SCADA) telemetry and M2M systems

Fleet management, vehicle data acquisition

Radiometrix Ltd

M48A Modem Data Sheet

page 1

12 3 4 5 6 7...9

中文翻译

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与M48A相关器件

型号	品牌	获取价格	描述	数据表
M48C260	TEMIC	获取价格	Microprocessor Circuit, CMOS, PDSO28, SSO-28
M48C260FN	VISHAY	获取价格	Microcontroller, 4-Bit, EEPROM, MARC4 CPU, 2MHz, CMOS, PDSO28,
M48C55A	ETC	获取价格	CPU时钟芯片
M48C892	ATMEL	获取价格	Microprocessor Circuit, CMOS, PDSO20, SO-20
M48C893	ATMEL	获取价格	Microcontroller, 4-Bit, FLASH, MARC4 CPU, 2MHz, CMOS, PDSO20,
M48C893	VISHAY	获取价格	Microcontroller, 4-Bit, FLASH, MARC4 CPU, 2MHz, CMOS, PDSO20,
M48E-006.400M	CONNOR-WINFIELD	获取价格	Oscillator,
M48E-006.4M	CONNOR-WINFIELD	获取价格	Clipped Sine Output Oscillator, 6.4MHz Nom, ROHS COMPLIANT, SUB MINIATURE, CERAMIC PACKAGE
M48E-009.720M	CONNOR-WINFIELD	获取价格	Oscillator
M48E-009.72M	CONNOR-WINFIELD	获取价格	Clipped Sine Output Oscillator, 9.72MHz Nom, ROHS COMPLIANT, SUB MINIATURE, CERAMIC PACKAG

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