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PDF RXM-433-LR Data sheet ( Hoja de datos )
| Número de pieza | RXM-433-LR | |
| Descripción | RECEIVER MODULE DATA GUIDE | |
| Fabricantes | Linx Technologies | |
| Logotipo |  |
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RXM-315-LR
RXM-418-LR
RXM-433-LR
WIRELESS MADE SIMPLE
LR SERIES RECEIVER MODULE DATA GUIDE
DESCRIPTION
The LR Receiver is ideal for the wireless
transfer of serial data, control, or command
information in the favorable 260-470MHz band.
n.
The receiver’s advanced synthesized superhet
architecture achieves an outstanding typical
0.630 in.
sensitivity of -112dBm, which provides a 5-10
times improvement in range over previous
solutions. When paired with a compatible Linx
Figure 1: Physical Dimensions
transmitter, a reliable wireless link is formed, capable of transferring data at rates
of up to 10,000bps at distances in excess of 3,000 feet. Applications operating at
short distances, or lower data rates will also benefit from increased link reliability
and superior noise immunity. Housed in a tiny reflow compatible SMD package,
the LR Receiver module is footprint compatible with the popular LC-S Receiver,
allowing existing users an instant path to improved range and lower cost. No
external components are required (except an antenna), allowing for easy
integration, even by engineers without previous RF experience.
FEATURES
Long-Range
Low-Cost
PLL Synthesized Architecture
Direct Serial Interface
Data Rates to 10,000 bps
Qualified Data Output
No External Components Needed
Low Power Consumption
Wide Supply Range (2.7 - 5.2VDC)
Compact Surface-mount Package
Wide Temperature Range
RSSI and Power-Down Functions
No Production Tuning
APPLICATIONS INCLUDE
Remote Control
Keyless Entry
Garage / Gate Openers
Lighting Control
Medical Monitoring / Call Systems
Remote Industrial Monitoring
Periodic Data Transfer
Home / Industrial Automation
Fire / Security Alarms
Remote Status / Position Sensing
Long-Range RFID
Wire Elimination
ORDERING INFORMATION
PART #
DESCRIPTION
EVAL-***-LR
Basic Evaluation Kit
MDEV-***-LR
Master Development Kit
TXM-315-LR
Transmitter 315 MHz
TXM-418-LR
Transmitter 418 MHz
TXM-433-LR
Transmitter 433 MHz
RXM-315-LR
Receiver 315 MHz
RXM-418-LR
Receiver 418 MHz
RXM-433-LR
Receiver 433 MHz
*** Insert Frequency
Receivers are supplied in tubes of 40 pcs.
Revised 11/26/03
1 page  
POWER SUPPLY REQUIREMENTS
The LR receiver module does not have an internal
voltage regulator, therefore it requires a clean, well-
regulated power source. While it is preferable to power
the unit from a battery, the unit can also be operated
from a power supply as long as noise and ‘hash’ are
less than 20mV. Power supply noise will manifest itself
as AM and FM noise and can significantly affect the
receiver sensitivity, therefore, providing a clean power
supply for the module should be a high design priority. Figure 14: Supply Filter
10R
A 10Ω resistor in series with the supply followed by a 10µF tantalum capacitor
from VCC to ground will help in cases where the quality of supply power is poor.
Note that operation from 4.3 to 5.2 volts requires the use of an external 330Ω
resistor placed in-line with the supply to prevent VCC from exceeding 3.6 volts.
USING THE PDN PIN
The receiver's Power Down (PDN) pin can be used to power the receiver down
without the need for an external switch. The PDN pin has an internal pull-up, so
when the PDN pin is held high or simply left floating the module will be active.
When the PDN pin is pulled to ground the receiver will enter into a low-current
(<40µA) power-down mode. During this time the receiver is off and cannot
perform any function. It may be useful to note that the startup time coming out of
power-down will be slightly less than when applying Vcc.
The PDN pin allows easy control of the receiver state from external components
such as a microcontroller. By periodically activating the receiver, checking for
data, then powering down, the receiver’s average current consumption can be
greatly reduced, saving power in battery operated applications.
Note: The voltage on the PDN pin should not exceed 3.6V. When using with a higher
voltage control source, such as a 5V microcontroller, an open collector line should be used
if available. As an alternative, a diode may be placed in series with the control line. Either
of these methods will prevent damage to the module by preventing 5V from being placed
on the PDN pin while still allowing the line to be pulled to ground.
USING THE RSSI PIN
The receiver's Received Signal Strength Indicator (RSSI) pin serves a variety of
uses. This pin has a dynamic range of 80dB (typical) and outputs a voltage
proportional to the incoming signal strength. A graph of the RSSI pin's
characteristics appears on Page 4 of this manual. It should be realized that the
RSSI levels and dynamic range will vary slightly from part to part. It is also
important to remember that RSSI output indicates the strength of any in-band RF
energy and not necessarily just that from the intended transmitter, therefore, it
should be used only to qualify the level and presence of a signal.
The RSSI output can be utilized during testing or even as a product feature to
assess interference and channel quality by looking at the RSSI level with all
intended transmitters shut off. The RSSI output can also be used in direction-
finding applications although there are many potential perils to consider in such
systems. Finally, the RSSI pin can be used to save system power by "waking up"
external circuitry when a transmission is received or crosses a certain threshold.
The RSSI output feature adds tremendous versatility for the creative designer.
Page 8
THE DATA OUTPUT
A CMOS-compatible data output is available on Pin 8. This output is normally used
to directly drive a digital decoder IC or a microprocessor that is performing the data
decoding. The receiver’s output is internally qualified, meaning that it will only
transition when valid data is present. In instances where no carrier is present the
output will remain low. Likewise, when the carrier is detected the output will go high.
The data output line can be directly connected to a digital IC or microprocessor that
will register the data and perform some function. In addition, the module can be
connected to an RS232 level converter chip, like the MAX232, or to a Linx USB
module for interfacing with a PC. The LR Series modules can also be used with
standard UARTs. Since a UART utilizes high marking to indicate the absence of
data, a designer using a UART may wish to insert a logic inverter between the data
output of the LR receiver and the UART.
RECEIVING DATA
Once a reliable RF link has been established, the challenge becomes how to
effectively transfer data across it. While a properly designed RF link provides
reliable data transfer under most conditions, there are still distinct differences
from a wired link that must be addressed. Since the LR modules do not
incorporate internal coding/decoding, a user has tremendous flexibility in how
data is handled.
It is always important to separate what type of transmissions are technically
possible from those that are legally allowable in the country of intended
operation. You may wish to review application notes #00125 and #00140 along
with Part 15 Section 231 for further details on acceptable transmission content.
If you want to transfer simple control or status signals such as button presses or
switch closures, and your product does not have a microprocessor on board or
you wish to avoid protocol development, consider using an encoder and decoder
IC set. These chips are available from a wide range of manufacturers including
Linx, Microchip, Holtek, and Motorola. These chips take care of all encoding and
decoding functions and generally provide a number of data pins to which
switches can be directly connected. In addition, address bits are usually provided
for security and to allow the addressing of multiple receivers independently.
These ICs are an excellent way to bring basic remote control/status products
quickly and inexpensively to market. Additionally, it is a simple task to interface
with inexpensive microprocessors such as the Microchip PIC or one of many IR,
remote control, DTMF, and modem IC’s.
While the LR is ideally suited to the long range transfer of control and command
information it can also be used with great success for the transfer of true variable
data such as temperature, pressure, or sensor data. However, the 260 - 470MHz
band in which the receiver operates is tightly regulated by Part 15 Section 231.
Many types of transmissions, especially those involving automatic transmissions
or variable data are required to be periodic. A careful review of these
requirements should be made prior to development. Application Note #00125
discusses these requirements in more detail.
Another area of consideration is that of data structure or protocol. If you are not
familiar with the considerations for sending serial data in a wireless environment
you will want to review Linx application note #00232.
Page 9
5 Page 
WIRELESS MADE SIMPLE
U.S. CORPORATE HEADQUARTERS:
LINX TECHNOLOGIES, INC.
575 S.E. ASHLEY PLACE
GRANTS PASS, OR 97526
Phone: (541) 471-6256
FAX: (541) 471-6251
http://www.linxtechnologies.com
Disclaimer
Linx Technologies is continually striving to improve the quality and function of its products. For
this reason, we reserve the right to make changes without notice. The information contained in
this Data Sheet is believed to be accurate as of the time of publication. Specifications are based
on representative lot samples. Values may vary from lot to lot and are not guaranteed. Linx
Technologies makes no guarantee, warranty, or representation regarding the suitability of any
product for use in a specific application. None of these devices is intended for use in
applications of a critical nature where the safety of life or property is at risk. The user assumes
full liability for the use of product in such applications. Under no conditions will Linx
Technologies be responsible for losses arising from the use or failure of the device in any
application, other than the repair, replacement, or refund limited to the original product purchase
price. Some devices described in this publication are patented. Under no circumstances shall
any user be conveyed any license or right to the use or ownership of these patents.
Page 20
© 2003 by Linx Technologies, Inc. The stylized
Linx logo, Linx, and “Wireless Made Simple”
are the trademarks of Linx Technologies, Inc.
Printed in U.S.A.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RXM-433-LR.PDF ] | |
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