EVAL-433-KH [ETC]
KH SERIES BASIC EVALUATION KIT USERâS GUIDE;
| 型号： | EVAL-433-KH |
| 厂家： | 
ETC |
| 描述： | KH SERIES BASIC EVALUATION KIT USERâS GUIDE |
| 文件： | 总5页 (文件大小：206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVAL-315-KH
EVAL-418-KH
EVAL-433-KH
WIRELESS MADE SIMPLE ®
KH SERIES BASIC EVALUATION KIT USER’S GUIDE
ORDERING INFORMATION
PART #
DESCRIPTION
EVAL-***-KH
KH Series Basic Evaluation Kit
*** = 315, 418 (Standard), 433MHz
INTRODUCTION
Linx KH Series RF modules offer a simple, efficient, and cost-effective method of
adding wireless communication capabilities to any product. The basic Evaluation Kit
is intended to give a designer all the tools necessary to correctly and legally
incorporate the LR Series modules into an end product. The development boards
themselves serve several important functions:
• Rapid Module Evaluation - The boards allow the performance of the Linx KH
Series modules to be evaluated quickly in a user’s environment.
• Range Testing - Using the on-board encoders and decoders to generate a
simplex transmission, a pair of development boards can be used to evaluate the
range performance of the modules.
• Design Benchmark - During the design process of your product, the boards
provide a known benchmark against which the performance of your own design
can be judged.
• Application Development - An on-board prototyping area is provided to allow a
designer to develop applications directly on the development board. All signal
lines are available on a breakout header for easy connection to the designer’s
circuits.
The purpose of this guide is to show the designer how to take full advantage of the
basic development boards included with the kit.
The kit includes 2 KH Series transmitters*, 2 KH2 Series receivers*, 2 extra PCB-
mount RP-SMA connectors, 2 development boards, 2 CW Series antennas, 2
CR2032 batteries, and full documentation.
*One part is soldered to the board, one extra for use on your first prototype board.
Revised 10/12/06
KH TRANSMITTER EVALUATION BOARD
THEORY OF OPERATION
TRANSMITTER EVALUATION BOARD
The transmitter board is powered by an on-board 3V CR2032 lithium battery. It
has two SPST pushbutton switches, the state of which is encoded into a data
stream by the module. If a switch is closed, the module will capture the settings
of the 10-position DIP switch address bits and pushbutton states for encoding
and transmission. Only the two switches that control the LED and buzzer on the
receiver board have been populated. The transmitter will transmit continuously
when any switch is closed or when Transmit Enable (TE) is pulled high (default).
If it is desired to control the TE line with external circuitry, then the trace marked
by JP3 can be cut and additional circuitry added.
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RECEIVER EVALUATION BOARD
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The receiver board is also powered by a 3V CR2032 lithium battery. The KH2
Series receiver exhibits a sensitivity of greater than -112dBm, so under optimum
line-of-sight conditions, the transmitter / receiver link can operate over distances
of up to 3,000 feet. The data recovered by the KH2 Series receiver is internally
decoded. If the settings of the 10-position DIP switch on the receiver board
match the address setting of the transmitter board, the data lines are updated to
match the state of the data lines (or pushbuttons) on the transmitter board. To
demonstrate this, one data line is used to drive a LED while another is used to
activate a buzzer. Switching transistors are used as drive buffers because the
KH2 receiver cannot directly source the current necessary to operate these
devices. This board has a prototyping area with all of the receiver lines brought
out to a header for easy access by external circuitry.
1. Battery - 3VDC (use a CR2032-style battery only)
2. Power Switch
3. Momentary Pushbutton - S0 (D0)
4. Momentary Pushbutton - S1 (D1)
5. Continuous Transmit Jumper
6. Transmit Enable Cut-Trace / Jumper (JP3)
7. Reverse-Polarity SMA Antenna Connector
8. KH Series Transmitter Module
9. 10-Position Address DIP Switch
KH RECEIVER EVALUATION BOARD
USING THE KIT
Using the kit is straightforward. Simply attach the antennas, turn on the power,
and press one or both of the buttons on the transmitter board. When S0 is
pressed, the buzzer will sound; when S1 is pressed, the LED will turn on.
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DEVELOPMENT USING THE PROTOTYPING AREA
In addition to its evaluation functions, the receiver board may also be used for
actual product development. It features a prototyping area to facilitate the
addition of application-specific circuitry. This area has a connection to VCC at the
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top and ground at the bottom that can be used to power the added circuitry.
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NOTE: The CR2032-style battery on the board has very low current capacity, with only
about 3mA available for external circuitry. If added circuitry requires a higher current, the
on-board battery must be removed and the board powered from an external source.
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The holes are plated and set at 0.100” on center with a 0.040” diameter, making
it easy to add most industry-standard SIP and DIP packages to the board.
1. Buzzer - D0
2. LED - D1
3. Battery - 3VDC (use a CR2032-style battery only)
4. Power Switch
5. Prototyping Area
6. KH2 Series Receiver Module
7. Reverse-Polarity SMA Antenna Connector
8. 10-Position Address DIP Switch
On the transmitter board, locations S2 to S7 are available for population of
switches or direct interface of logic leval inputs. On the receiver board, the data
lines from the decoder plus the PDN, and DATA lines from the receiver have
been wired out. This allows for easy access to connect external circuitry to the
modules, the encoder, and the decoder. Data line D0 is connected to the buzzer
and D1 is connected to the LED.
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RANGE TESTING
USING THE BOARDS AS A DESIGN REFERENCE
Several complex mathematical models exist for determining path loss in many
environments. These models vary as the transmitter and receiver are moved
from indoor operation to outdoor operation. Although these models can provide
an estimation of range performance in the field, the most reliable method is to
simply perform range tests using the transmitter and receiver in the intended
operational environment.
The basic evaluation boards included in this kit are very simple, yet they illustrate
some important techniques that you may wish to incorporate into your own board
layout. You will observe that the KH mounting pads extend slightly past the edge
of the part. This eases hand assembly and allows for better heat conduction
under the part if rework is necessary. Next, observe the use of a full ground
plane fill on the lower side of the board. This ground plane serves three important
purposes:
Simple range testing can be performed with the transmitter and receiver
evaluation boards. To prepare the board for range testing, ensure that JP3 is
closed on the transmitter board and that the address line DIP switches on both
boards are identically set. Turn on the boards by switching the power switch to
the ON position. Pressing S0 on the transmitter will activate the buzzer on the
receiver board, while S1 activates the LED. Placing a jumper across JP1 or JP2
will cause the transmitter to continiously transmit. This will allow the designer to
turn on the transmitter and walk with the receiver.
First, since a 1/4-wave antenna is employed, the ground plane is critical to serve
as a counterpoise (you may wish to read Application Note AN-00500 Antennas:
Design, Application, and Performance for additional details on how a ground
plane affects antenna function).
Second, a ground plane will suppress the transfer of noise between stages of a
product, as well as unintentional radiation of noise into free space.
Third, a ground plane allows for the implementation of a microstrip feed to the
antenna. The term microstrip refers to a PCB trace running over a ground plane
that is designed to serve as a 50-ohm transmission line between the module and
the antenna. A microstrip is implemented on this evaluation board. If you are
unfamiliar with microstrip calculations, you may wish to refer to the KH Series
data guides or the calculator available on our website.
As you near the maximum range of the link in your area, it is not uncommon for
the signal to cut in and out as you move. This is normal and can result from other
interfering sources or fluctuating signal levels due to multipath effects. This
results in cancellation of the transmitted signal as direct and reflected signals
arrive at the receiver at differing times and phases. The areas in which this
occurs are commonly called “nulls” and simply walking a little farther will usually
restore the signal.
IN CLOSING
Since the evaluation boards are intended for use by design engineers, they are
not FCC certified. The transmitter has been set to approximate legal limits by
resistor R1 so that the range test results will approximate the results from a well-
designed, certified product. For applications where Part 15 limits are not
applicable or output levels can be legally raised due to protocol duty cycle, R1
can be changed according to the graph on Page 3 of the KH Series Transmitter
Data Guide.
Here at Linx, “Wireless Made Simple” is more than just our motto, it is our
commitment. A commitment to the highest caliber of product, service, and
support. That is why, should you have questions or encounter any difficulties
using the evaluation kit, you’ll be glad to know many resources are available to
assist you. First, check carefully for the obvious, then visit our website at
www.linxtechnologies.com or call 541-471-6256 between 9AM and 4PM Pacific
Time to speak with an application engineer.
To achieve maximum range, keep objects such as your hand away from the
antenna and ensure that the antenna on the transmitter has a clear and
unobstructed line-of-sight path to the receiver board. Range performance is
determined by many interdependent factors. If the range you are able to achieve
is significantly less than specified by Linx for the products you are testing, then
there is likely a problem with either the board or the ambient RF environment in
which the board is operating. First, check the battery, jumper routing, and
antenna connections. Next, measure the receiver’s RSSI voltage with the
transmitter turned off to determine if ambient interference is present. If this fails
to resolve the issue, please contact Linx technical support.
Legal Notice
All Linx kits and modules are designed in keeping with high engineering standards;
however, it is the responsibility of the user to ensure that the products are operated in a
legal and appropriate manner. The purchaser understands that legal operation may require
additional permits, approvals, or certifications prior to use, depending on the country of
operation.
ONLINE RESOURCES
If you have questions regarding any Linx product and have Internet access,
make www.linxtechnologies.com your first stop. Our website is organized in an
intuitive format to give you the answers you need. Day or night, the Linx website
gives you instant access to the latest information regarding the products and
services of Linx. It’s all here: manual and software updates, application notes, a
comprehensive knowledgebase, FCC information, and much more. Be sure to
visit often!
ABOUT ANTENNAS
The choice of antennas is one of the most critical and often overlooked design
considerations. The range, performance, and legality of an RF link are critically
dependent upon the type of antenna employed. Linx offers a variety of antenna
styles that you may wish to consider for your design. Included with your kit is a
Linx CW Series connectorized whip antenna that should be connected prior to
using the kit. Despite the fact that the antenna is not centered on the board’s
ground plane, it exhibits a VSWR of <1.7 and suitably demonstrates the
module’s best practical performance.
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EVAL-***-KH Receiver Board Schematic
EVAL-***-KH Transmitter Board Schematic
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WIRELESS MADE SIMPLE ®
U.S. CORPORATE HEADQUARTERS
LINX TECHNOLOGIES, INC.
159 ORT LANE
MERLIN, OR 97532
PHONE: (541) 471-6256
FAX: (541) 471-6251
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 User’s Guide 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 or
legality 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.
© 2006 by Linx Technologies, Inc. The stylized Linx logo,
Linx, “Wireless made Simple”, CipherLinx and the stylized
CL logo are the trademarks of Linx Technologies, Inc.
Printed in U.S.A.
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