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WIRELESS MADE SIMPLE (R)
OEM KEYFOB TRANSMITTER DATA GUIDE DESCRIPTION
The Linx CMD-KEY#-***-xxx Keyfob transmitter is ideal for general-purpose remote control and command applications. It has been pre-certified for FCC Part 15, Industry Canada, and European CE (433MHz only) compliance, reducing development costs and time to market. Available in 315, 418 (standard), or 433.92MHz, this stylish and compact remote has a range of up to 750 feet when combined with the LR Series receiver. The Keyfob can be configured with 1 to 5 buttons and the keypad and labeling can be modified to meet specific customer requirements. Selectable addressing provides security and allows the creation of up to 1,024 distinct transmitterreceiver relationships. The Keyfob is available in black, white, or translucent colors. The transmission can be decoded using a matching Linx Function Module, KH Series receiver / decoder, or an LR or LT Series receiver paired with a decoder IC or microcontroller. The unit operates from a single 3V CR2032 lithium button cell.
1.00"
S4 S1 S5 S3 S2
2.23"
1.37"
0.45"
Figure 1: Package Dimensions
FEATURES
n n n n n n n n n n n FCC, Canada, and CE pre-certified 1 to 5 buttons Small package Customizable keypad General Remote Control Keyless Entry Garage / Gate Openers Lighting Control Call Systems Home / Industrial Automation Wire Elimination
OEM Configurations
With a one-time NRE and minimum order, Linx can configure the keypad and label areas to meet your specific requirements. Contact Linx for details.
APPLICATIONS INCLUDE
ORDERING INFORMATION
PART # DESCRIPTION CMD-KEY#-***-xxx Keyfob Transmitter EVAL-***-KEY# Keyfob Basic Evaluation Kit # = Number of Buttons: 1 to 5 *** = 315, 418 (Standard), 433.92 MHz xxx = Color Leave blank for standard Black WHT = White CGY= Gray CBL = Blue CRE = Red CPU = Purple
Revised 01/19/10
ELECTRICAL SPECIFICATIONS
Parameter POWER SUPPLY Operating Voltage Supply Current Power-Down Current TRANSMITTER SECTION Transmit Frequency Range: CMD-KEY#-315 CMD-KEY#-418 CMD-KEY#-433 Center Frequency Accuracy ENVIRONMENTAL Operating Temperature Range - - Designation VCC ICC IPDN FC - - - -50 -40 315 418 433.92 - - - - - +50 +85 MHz MHz MHz kHz C - - - - 1 Min. 2.1 - - Typical 3.0 3.4 5.0 Max. 3.6 - - Units VDC mA nA Notes - - 1
SETTING THE TRANSMITTER ADDRESS
The Keyfob allows the selection of one of 1,024 unique addresses. All keyfobs are supplied set to the same address. To avoid contention with other units or to create unique relationships, the address can be changed. This is accomplished by cutting the traces with a sharp object, such as an X-Acto knife. The traces are accessed by removing the rear cover. If the trace is intact, the address line is Figure 2: DIP Switch Assignments connected to ground, otherwise it is floating. The receiver's address must match exactly in order for the units to communicate. Application Note AN-00300 describes in detail how to set the address to match any of the receivers offered by Linx. This note can be found in the Support section of the Linx website, www.linxtechnologies.com.
Notes
1. Characterized, but not tested
BUTTON ASSIGNMENTS THEORY OF OPERATION
The CMD-KEY#-*** Keyfob transmitter combines the LR Series transmitter with an on-board Holtek HT640 encoder IC to form a simple, yet effective, RF remote control transmitter. The LR transmitter is a low-cost, high-performance, synthesized ASK / OOK transmitter. The transmitter's synthesized architecture delivers outstanding stability and frequency accuracy while minimizing the effects of antenna port loading and mismatching. This reduces or eliminates frequency pulling, bit contraction, and other negative effects common to SAW-based transmitter architectures, providing a significantly higher level of performance and reliability. When a button is pressed on the transmitter, power is applied to the internal circuitry and the encoder IC is enabled. The encoder detects the logic states of the address lines and button data lines. These states are formatted into a threeword transmission cycle that continues until the button is released. The encoder data is used to modulate the transmitter, which, through the antenna, conveys the data into free space. On the receiver side, a decoder IC or custom microcontroller is used to check the transmitter's address bits against the address settings of the receiving device. If a match is confirmed, the decoder's outputs are set to replicate the transmitter's button states. These outputs can then be used to activate external circuitry required by the application. The transmitter is compatible with several Linx receiver products, including the LR, KH2, LT, and OEM product families. For applications where range is critical, the LR Series receiver is the best choice due to its outstanding sensitivity. When the transmitter is combined with an LR Series receiver and the HT658 decoder chip, ranges of up to 750 feet are possible. Applications operating over shorter distances will also benefit from the increased link reliability and superior noise immunity provided by the LR Series receiver. The Keyfob is available in five unique button configurations. Those configurations and the corresponding switch numbers are shown in the figure below. The table shows which encoder data line has been assigned to each switch. When a button is pressed, the data line will go high, causing the corresponding data line on the decoder to go high if the addresses match.
S4 S5 S2
S4 S5 S2
Button
S4 S1 S2 S3 S4 S1 S5 S3 S2
Data Line D0 D1 D2 D3 D4
S1 S2 S3 S4 S5
Figure 3: CMD-KEY#-*** Button Assignments
Page 2 Page 3
CONTENTION CONSIDERATIONS
It is important to understand that only one transmitter at a time can be activated within a reception area. While the transmitted signal consists of encoded digital data, only one carrier of any particular frequency can occupy airspace without contention at any given time. If two transmitters are activated in the same area at the same time, then the signals will interfere with each other and the decoder will not see a valid transmission, so it will not take any action.
COMPLIANCE REQUIREMENTS
The CMD-KEY#-*** has been pre-certified by Linx Technologies for FCC Part 15 and Industry Canada RSP-100 compliance. The 433.92MHz version has also been tested for CE compliance for use in the European Union. The 315MHz and 418MHz versions are not legal for use in Europe.
LABELING / INSTRUCTION REQUIREMENTS
The CMD-KEY#-*** Keyfob Transmitter has already been labeled in accordance with FCC, Industry Canada, and CE regulations in effect as of the date of this document. No further labeling of the unit is needed; however, it is necessary to include the following statement in the end product's instruction manual or insert card for FCC compliance. Industry Canada only requires the shaded portion. EU does not require a statement.
BATTERY REPLACEMENT
The remote unit utilizes a standard CR2032 lithium button cell. In normal use, it will provide 1 to 2 years of operation. Access for replacement is accomplished by gently prying apart the two halves of the keyfob at the seam (fingernails will do for this). Once the unit is open, remove the battery by sliding it out from beneath the retainer. There may be the risk of explosion if the battery is replaced by the wrong type. Replace it with the same type of battery while observing the polarity shown in the adjacent figure.
Battery
+
INSTRUCTION TO THE USER This device complies with Part 15 of the FCC Rules. Operation of this device is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. This equipment has been certified to comply with the limits for a Class B computing device, pursuant to FCC Rules. In order to maintain compliance with FCC regulations, shielded cables must be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV reception. The user is cautioned that changes and modifications made to the equipment without the approval of manufacturer could void the user's authority to operate this equipment.
Figure 4: Battery Access
ASSEMBLY DIAGRAM
Figure 5: CMD-KEY#-*** Assembly
Page 4
Place the above statement in the instruction manual or insert card.
Page 5
CUT TRACE FOR ADDRESS SELECT
There are four options for receivers within the Linx product line. The first option is to use one of the OEM Function Modules, such as the Relay Module or the AC Wall Module. These items are also pre-certified and can be immediately included in a product. The other options are to use one of the Linx receiver modules. The signal sent by the Keyfob transmitter can be received by the LR Series receiver module or the LT Series transcever module. These modules can be connected to the Holtek HT658 decoder to decode the signal, or a custom microcontroller can be programmed to decode it and take specific action. The KH2 Series offers a slightly simpler solution by combining the LR Series receiver and the HT658 decoder in a single package. When a button is pressed on the transmitter, a corresponding line on the decoder will go high (as long as the addresses match). This can then be connected to whatever circuitry is required by the application. Application Note AN-00300 discusses in detail how to set the addresses on all of the units. Data guides for all of the receivers, the HT640 encoder, and the HT658 decoder can be found on the Linx Technologies website, www.linxtechnologies.com.
VCC
GND
RECEIVERS
B1
D1 D2 D3 D4 D5 D6 D7 DOUT TE OSC2 OSC1 GND
VCC D0 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
390k
R4
GND
HT640
U1
VCC
VCC
GND IADJ/VCC DATA IN RF OUT
TOUCHPAD
TYPICAL APPLICATIONS
The outstanding sensitivity of the LR Series receiver offers the best range when combined with the Keyfob transmitter. When using the LR Series receiver, the Holtek HT658 decoder chip should be connected to decode the received signal. This decoder has ten address lines that must match the Keyfob address lines. A DIP switch is commonly used to set these, but they can also be hardwired. As long as the address lines match, when a button on the Keyfob is pressed, a corresponding data line on the decoder (D0-D4) will go high. These data lines can then be connected to external circuitry to perform whatever function is required by the application.
GND
PDN
VCC
GND TOUCHPAD S5 VCC
VCC
GND
RXM-LR
VCC 1 2 3 4 5 6 7 8 9 10 11 12 GND D1 D2 D3 D4 D5 D6 D7 VT DIN OSC1 OSC2 GND HT658 GND VCC D0 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 24 23 22 21 20 19 18 17 16 15 14 13
TOUCHPAD
TOUCHPAD
R1 390k
TOUCHPAD
S1
S2
S3
Figure 7: CMD-KEY#-*** Schematic Diagram
Page 6 Page 7
VCC
Figure 6: LR Receiver and HT658 Schematic
S4
Set For FCC Compliance
GND
GND R1
1 2 3 4 5 6 7 8
NC NC NC GND VCC PDN RSSI DATA
ANT GND NC NC NC NC NC NC
16 15 14 13 12 11 10 9
GND
TXM-LR
GND
GND
WIRELESS MADE SIMPLE (R)
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 to our products without notice. The information contained in this Data 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. "Typical" parameters can and do vary over lots and application. Linx Technologies makes no guarantee, warranty, or representation regarding the suitability of any product for use in any specific application. It is the customer's responsibility to verify the suitability of the part for the intended application. NO LINX PRODUCT IS INTENDED FOR USE IN ANY APPLICATION WHERE THE SAFETY OF LIFE OR PROPERTY IS AT RISK. Linx Technologies DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL LINX TECHNOLOGIES BE LIABLE FOR ANY OF CUSTOMER'S INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY FROM ANY DEFECTIVE OR NON-CONFORMING PRODUCTS OR FOR ANY OTHER BREACH OF CONTRACT BY LINX TECHNOLOGIES. The limitations on Linx Technologies' liability are applicable to any and all claims or theories of recovery asserted by Customer, including, without limitation, breach of contract, breach of warranty, strict liability, or negligence. Customer assumes all liability (including, without limitation, liability for injury to person or property, economic loss, or business interruption) for all claims, including claims from third parties, arising from the use of the Products. The Customer will indemnify, defend, protect, and hold harmless Linx Technologies and its officers, employees, subsidiaries, affiliates, distributors, and representatives from and against all claims, damages, actions, suits, proceedings, demands, assessments, adjustments, costs, and expenses incurred by Linx Technologies as a result of or arising from any Products sold by Linx Technologies to Customer. 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. Devices described in this publication may contain proprietary, patented, or copyrighted techniques, components, or materials. Under no circumstances shall any user be conveyed any license or right to the use or ownership of such items.
(c) 2010 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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