M48A-000-DIL RADIOMETRIX, M48A-000-DIL Datasheet

no-image

M48A-000-DIL

Manufacturer Part Number
M48A-000-DIL
Description
IC, CONTROLLER, SERIAL MODEM, 20DIP
Manufacturer
RADIOMETRIX
Datasheet

Specifications of M48A-000-DIL

Baud Rate
4800baud
Supply Voltage Range
4.5V To 5.5V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
DIP
No. Of Pins
20
Controller Type
MOSFET
Data Format
Asynchronous
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.
M48A MODEM
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
Applications
Radiometrix Ltd
M48A modem chip – for narrow band wireless data link
Operating voltage (temperature):
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
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
5V for standard version (-40°C to +85°C)
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
PRELIMINARY
M48A Modem Data Sheet
Figure 1: M48A-000-DIL modem IC
Issue B, 15 October 2010
page 1

Related parts for M48A-000-DIL

M48A-000-DIL Summary of contents

Page 1

... 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 PRELIMINARY Figure 1: M48A-000-DIL modem IC M48A Modem Data Sheet Issue B, 15 October 2010 page 1 ...

Page 2

... User Interface M48A is an 18pin PIC16F648A (SO, DIL), running proprietary software. It requires a 4.5v minimum supply. 1 Aux out 2 LAMP 3 TXE 4 RST 5 Vss (0V FLOW 7 RSTXD 8 RSRXD 9 RX FLOW Figure 2: package type, 18-Lead Plastic Dual In-line (PDIP - 300mil wide body) Pin description (SO, DIL): Pin Name ...

Page 3

... The M48A is a 4800 baud radio modem, compatible with narrowband radios. Just a faster i1200 simpler RPM1 ? ....... not quite. What does an M48A the simplest possible sense, the M48A is just a radio modem baseband device. It provides an interface between a user's asynchronous (“RS232 type”) serial port and the audio channel of a low power radio module. ...

Page 4

... M48 replies with a login message “M48 SETUP” and enters setup mode Radiometrix Ltd Sensitivity +0dB Data rate 2400 baud Sensitivity +3dB Data rate 1200 baud Sensitivity +5dB Data rate 600 baud Sensitivity +7dB M48A Modem Data Sheet page 4 ...

Page 5

... STATE command (see later) shortcut for the RX command clears the input buffer NOTES b1, b2 are baud rates Only the first two digits are needed, i.e. BAUD 12 iss valid M48A Modem Data Sheet page 5 ...

Page 6

... On transmit, a different burst identifier is attached to each new packet. The receiving unit ignores the second (and subsequent) packet with the same identifier. This allows a receiving M48 to ignore multiple copies of the same data packet (as will be encountered in multiple transmission or repeater/network systems) Radiometrix Ltd M48A Modem Data Sheet page 6 ...

Page 7

... Command mode transmit operations $ (length byte) (1-16 byte data string) Radiometrix Ltd Outputs the text string between the [ ] characters As above, but with an added CR (13) appended to theend of the outputted string ( Note ASCII 36 ) M48A Modem Data Sheet page 7 ...

Page 8

... This is especially useful for the master node in point to multi-point operation. Timings The data throughput of the M48A is limited by the radio path. In continuously streaming (transparent) mode a baud rate of 4800 baud is supported without any buffer overflows. Byte latency is influenced by the switching performance of the radio (and the programmed DELAY and PREAM values) ...

Page 9

... Ordering Information: M48A-000-SS - Shrink Small Outline (see figure 3 below) M48A-000-SO - Small Outline M48A-000-DIL - Plastic Dual In Package Pin description for M48A-000-SS 1 Aux out 2 LAMP 3 TXE 4 RST 5 Vss (0V) 6 Vss (0V FLOW 8 RSTXD 9 RSRXD 10 RX FLOW Figure 3: 20-Lead Plastic Shrink Small Outline (SS) – 209 mil, 5.30 mm (SSOP) ...

Page 10

... Application circuit Radiometrix Ltd 10 M48A Modem Data Sheet page ...

Page 11

... Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice ...

Related keywords