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PDF TXM-433-LC Data sheet ( Hoja de datos )
| Número de pieza | TXM-433-LC | |
| Descripción | TRANSMITTER MODULE DATA GUIDE | |
| Fabricantes | Linx Technologies | |
| Logotipo |  |
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TXM-315-LC
TXM-418-LC
TXM-433-LC
LC SERIES TRANSMITTER MODULE DATA GUIDE
DESCRIPTION:
PHYSICAL DIMENSIONS
The LC Series is ideally suited for volume use
in OEM applications such as remote control,
security, identification, and periodic data
transfer. Packaged in a compact SMD package,
the LC transmitter utilizes a highly optimized
SAW architecture to achieve an unmatched
blend of performance, size, efficiency and cost.
When paired with a matching LC series
receiver, a highly reliable wireless link is
formed, capable of transferring serial data at
distances in excess of 300 Feet. No external RF
components, except an antenna, are required,
making design integration straightforward, even
for engineers lacking previous RF experience.
.360
.500
TOP VIEW
FEATURES:
s Low Cost
s No External RF Components
Required
s Ultra-low Power Consumption
s Compact Surface-Mount Package
s Stable SAW-based Architecture
PINOUTS
s Supports Data Rates to 5,000 bps
s Wide Supply Range (2.7-5.2 VDC)
s Direct Serial Interface
s Low Harmonics
s No Production Tuning
APPLICATIONS INCLUDE:
s Remote control
s Keyless entry
s Garage / Gate openers
s Lighting control
s Medical monitoring / Call systems
s Remote industrial monitoring
s Periodic data transfer
s Home / Industrial automation
s Fire / Security alarms
s Remote status / Position sensing
s Long-range RFID
s Wire Elimination
ORDERING INFORMATION
PART #
DESCRIPTION
EVAL-***-LC
MDEV-***-LC
TXM-315-LC
TXM-418-LC
TXM-433-LC
RXM-315-LC
RXM-418-LC
RXM-433-LC
Basic Evaluation Kit
Master Development Kit
Transmitter 315 MHZ
Transmitter 418 MHZ
Transmitter 433 MHZ
Receiver 315 MHZ
Receiver 418 MHZ
Receiver 433 MHZ
*** Insert Frequency
Not covered in this manual
LC Transmitters are supplied in tube
packaging - 50 pcs. per tube.
Revised 12/21/01
1 page  
TRANSMITTING 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 LC modules do not incorporate internal
coding/decoding, a user has tremendous flexibility in how data is formatted and sent.
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 Sec. 231 for
further details on acceptable transmission content.
Another consideration is that of data structure or protocol. If you are not familiar with
the sending serial data in a wireless environment read Linx application note #00232
(Considerations for sending data with the LC series). This application note details
important issues such as the effect of start-up times, pulse stretching and shortening
and the relationship between data and output power in a CPCA-based transmitter.
These issues should be understood prior to commencing a design effort.
If you want to send simple control or status signals such as button presses or switch
closures, consider using an encoder and decoder IC set available from a wide range
of manufacturers including: Microchip (Keeloq), Holtek, and Motorola. These IC’s take
care of all encoding, error checking, and decoding functions and generally provide a
number of data pins to which switches can be directly connected. Address bits are
usually provided for security and to allow the addressing of multiple receivers
independently. 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.
Shown below is an example of a basic remote control transmitter utilizing a encoder
chip from Holtek. When a key is pressed at the transmitter, a corresponding pin at the
receiver goes high. A schematic for the receiver/decoder circuit may be found in the
LC receiver guide.
BOARD LAYOUT CONSIDERATIONS
If you are at all familiar with RF devices you
may be concerned about specialized board
layout requirements. Fortunately, because
of the care taken by Linx in designing the
LC series, integration is very
straightforward. This ease of application
results from the advanced multi-layer
construction of the module. By adhering to
the following layout principles and
observing a few basic design rules, you can
enjoy a straightforward path to RF success.
GROUNDPLANE
ON BOTTOM LAYER
1. A groundplane should be placed under
the module as shown. It will generally be figure 13: Example of proper
placed on the bottom layer. The amount
groundplane
of overall plane is also critical for the
correct function of many antenna styles and is covered in the next section.
2. Observe appropriate layout practice between the module and its antenna. A
simple trace may suffice for runs of less than .25" but longer distances should be
covered using 50Ω coax or a 50Ω microstrip transmission line. In order to
minimize loss and detuning, a microstrip transmission line is commonly utilized.
The term microstrip refers to a PCB trace running over a groundplane, the width
of which has been calculated to serve as a 50Ω transmission line. This effectively
removes the trace as a source of detuning. The correct trace width can be easily
calculated using the information below.The width is based on the desired
characteristic impedance, the thickness of the PCB, and its dielectric constant.
figure 12: Basic Remote Control Transmitter Circuit
Notes:
1) DIP Switch used to set ID code. A 3-position switch was chosen for this example but all or none of the
address bits may be used. Settings of the Receiver and Transmitter must match for signal to be recognized.
Page 8
figure 14: Microstrip formulas (Er = Dielectric constant of pc board material)
Dielectric
Constant
4.8
4
2.55
Width/Height
(W/d)
1.8
2
3
Effective
Dielectric
Constant
3.59
3.07
2.12
Characteristic
Impedance
50.0
51.0
48.0
Page 9
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet TXM-433-LC.PDF ] | |
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