WIRELESS MADE SIMPLE OEM KEYFOB TRANSMITTER DATA GUIDE DESCRIPTION The Linx CMD-KEY -***-xxx Keyfob transmitter is ideal for general-purpose remote control and command appli cations. It has been pre-certified for FCC Part 15, 1.00 Industry Canada, and European CE S4 (433MHz only) compliance, reducing S1 S5 S3 2.23 development costs and time to market. S2 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 1.37 0.45 be configured with 1 to 5 buttons and the keypad and labeling can be modified to meet specific customer requirements. Selectable Figure 1: Package Dimensions addressing provides security and allows the creation of up to 1,024 distinct transmitter- receiver 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. OEM Configurations FEATURES With a one-time NRE and minimum n FCC, Canada, and CE pre-certified order, Linx can configure the keypad n 1 to 5 buttons and label areas to meet your specific n Small package requirements. Contact Linx for details. n Customizable keypad ORDERING INFORMATION APPLICATIONS INCLUDE PART DESCRIPTION n General Remote Control CMD-KEY -***-xxx Keyfob Transmitter n Keyless Entry EVAL-***-KEY Keyfob Basic Evaluation Kit n Garage / Gate Openers = Number of Buttons: 1 to 5 n Lighting Control *** = 315, 418 (Standard), 433.92 MHz n Call Systems xxx = Color Leave blank for standard Black n Home / Industrial Automation WHT = White CGY= Gray CBL = Blue n Wire Elimination CRE = Red CPU = Purple Revised 01/19/10ELECTRICAL SPECIFICATIONS SETTING THE TRANSMITTER ADDRESS The Keyfob allows the selection of one Parameter Designation Min. Typical Max. Units Notes of 1,024 unique addresses. All keyfobs POWER SUPPLY are supplied set to the same address. Operating Voltage V 2.1 3.0 3.6 VDC CC To avoid contention with other units or Supply Current I 3.4 mA CC to create unique relationships, the Power-Down Current I 5.0 nA 1 PDN address can be changed. This is TRANSMITTER SECTION accomplished by cutting the traces with Transmit Frequency Range: F C a sharp object, such as an X-Acto knife. CMD-KEY -315 315 MHz The traces are accessed by removing CMD-KEY -418 418 MHz the rear cover. CMD-KEY -433 433.92 MHz Center Frequency Accuracy -50 +50 kHz If the trace is intact, the address line is Figure 2: DIP Switch Assignments ENVIRONMENTAL connected to ground, otherwise it is Operating Temperature Range -40 +85 C 1 floating. The receivers address must match exactly in order for the units to communicate. Application Note AN-00300 describes in detail how to set the Notes address to match any of the receivers offered by Linx. This note can be found in 1. Characterized, but not tested the Support section of the Linx website, www.linxtechnologies.com. BUTTON ASSIGNMENTS THEORY OF OPERATION The Keyfob is available in five unique button configurations. Those configurations and the corresponding switch numbers are shown in the figure The CMD-KEY -*** Keyfob transmitter combines the LR Series transmitter with below. The table shows which encoder data line has been assigned to each an on-board Holtek HT640 encoder IC to form a simple, yet effective, RF remote switch. When a button is pressed, the data line will go high, causing the control transmitter. The LR transmitter is a low-cost, high-performance, corresponding data line on the decoder to go high if the addresses match. synthesized ASK / OOK transmitter. The transmitters 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. S4 S4 When a button is pressed on the transmitter, power is applied to the internal S5 S5 circuitry and the encoder IC is enabled. The encoder detects the logic states of S2 the address lines and button data lines. These states are formatted into a three- S2 word 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 transmitters address bits against the address settings of the receiving device. If a match is confirmed, the decoders outputs are set to replicate the transmitters button states. These outputs can then be used to activate external circuitry required by the application. Button Data Line The transmitter is compatible with several Linx receiver products, including the S1 D0 S4 LR, KH2, LT, and OEM product families. For applications where range is critical, S4 S2 D1 the LR Series receiver is the best choice due to its outstanding sensitivity. When S1 S3 S1 S5 S3 the transmitter is combined with an LR Series receiver and the HT658 decoder S3 D2 S2 S2 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 S4 D3 immunity provided by the LR Series receiver. S5 D4 Figure 3: CMD-KEY -*** Button Assignments Page 2 Page 3