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| 型號： | RFEVAL1-SYS |
| 英文描述： | EVALUATION BOARD RF |
| 中文描述： | 評價委員會射頻 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 614K |
| 代理商： | RFEVAL1-SYS |
DS000023 Ver 1.1 JAN 00
1999 Reg. No. 227 4001, ENGLAND
Page 11
R
ADIO
E
VALUATION
K
IT
RFEVAL1
Appendix A: An Introduction to KEELOQ
The keeloq system is a patented code hopping technology used primarily in remote control applications.
The encryption and decryption devices are manufactured by Microchip Technology Inc. and provide an
ideal solution to remote control systems. The Keeloq algorithm is a highly secure digital data protocol
that uses a 67-bit transmission code. Each time a switch is pressed on a transmitter encoder the data
transmitted is different, even if the same switch is pressed twice. A corresponding receiver decoder will
also never respond to the same code twice. By using a large number of possible transmission
combinations means it would take over 5,000 Billion years for a person to scan through all the possible
combinations.
For a Keeloq encoder and decoder to work with each other they both must have the same Manufactures
Key. This is 64-bit number that is programmed into each device. Once both chips have the same
Manufactures Key then a encoder can be taught to a decoder. The decoder then stores in memory the
Serial Number of the encoder, this is a unique number that is programmed into each encoder. In this
system the receiver decoder automatically ‘hops’ in sync with the transmitter encoder. If a transmitter
encoder is pressed more than 50 times out of range of the receiver decoder then the system will be out
of sync. If this situation occurs then the user only needs to press the switch twice on the transmitter
encoder within the range of the receiver decoder for the system to resynchronise.
The keeloq system also has various built in functions. Auto Shut-off Timer is used if a switch on the
encoder inadvertently gets pressed for a long period of time. After 25 seconds the auto shut-off function
automatically stops the device from transmitting and so prevents the transmitter from draining the
battery. The keeloq encoder also transmits the voltage status of the battery. If the battery voltage
becomes low then the Keeloq encoder will transmit this information to the decoder. The decoder can
then indicate to the user that the transmitter battery needs replacing.
For more detailed information on Keeloq please refer to the Microchip Technology data sheets.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RFEVAL2-315 | 功能描述:BOARD EVALUATION RF 315MHZ RoHS:否 類別:RF/IF 和 RFID >> RF 評估和開發(fā)套件，板 系列:KEELOQ® 標準包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
| RFEVAL2-315R1 | 制造商:RFSOLUTIONS 制造商全稱:rfsolutions.ltd 功能描述:RF / IR Encoder / Decoder Chipset RF Evaluation Boards |
| RFEVAL2-433R2 | 制造商:RFSOLUTIONS 制造商全稱:rfsolutions.ltd 功能描述:RF / IR Encoder / Decoder Chipset RF Evaluation Boards |
| RFEVAL3 | 功能描述:KIT EVAULATION WITH ANTENNA RoHS:否 類別:RF/IF 和 RFID >> RF 評估和開發(fā)套件，板 系列:KEELOQ® 標準包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
| RFEVAL3-R1 | 制造商:RFSOLUTIONS 制造商全稱:rfsolutions.ltd 功能描述:RF / IR Encoder / Decoder Chipset RF Evaluation Boards |
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