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Microchip Technology encoders provide KEELOQ security feature

Posted: 30 Apr 2002 ?? ?Print Version ?Bookmark and Share

Keywords:rfhcs362g? rfhcs362f? keeloq? wireless encoder? rf transmitter?

The rfHCS362G and rfHCS362F wireless encoders from Microchip Technology integrate a built-in RF transmitter that feature the company's KEELOQ access control system.

Targeted applications for the devices include electronic door locks, garage door openers, remote keyless entry, burglar alarm systems, property identification, remote control, auto immobilizers, and theft protection.

The KEELOQ code hopping technology makes each transmission unique, thereby eliminating the threat of capture and re-send schemes, while the length of the transmission eliminates the threat of code scanning.

The rfHCS362G/F encoders offer a programmable 32-bit serial number and two 64-bit user-programmable encryption keys for secure identification. They provide an output power adjustable from -12dBm to 2dBm and a VCO phase-locked to a quartz crystal reference, enabling the implementation of a narrow receiver bandwidth that maximizes range and interference immunity even at low RF power levels.

The devices also feature button queuing to increase the number of functions and enable a single button to perform multiple functions. Both support Manchester and PWM encoding, and provide timing output bits to determine how long a button was pressed.

Additional features include programmable time-out options, programmable data rates and code word blanking options, a tunable oscillator, and low voltage detector.

The rfHCS362G features an integrated 31MHz to 440MHz ASK transmitter, while the rfHCS362F has an FSK transmitter in the same frequency range. Both operate at 2.2V and draw <1?A.

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