DESCRIPTION
The Microchip Technology Inc. HCS515 is a code hopping decoder designed for secure Remote Keyless Entry (RKE) systems. The HCS515 utilizes the patented KEELOQ code hopping system and high security learning mechanisms to make this a canned solution when used with the HCS encoders to implement a unidirectional remote and access control systems. The HCS515 can be used as a stand-alone decoder or in conjunction with a microcontroller.

FEATURES
Security
• Encrypted storage of manufacturer’s code
• Encrypted storage of encoder decryption keys
• Up to seven transmitters can be learned
• KEELOQ code hopping technology
• Normal and secure learning mechanisms

Operating
• 3.0V—5.5V operation
• Internal oscillator
• Auto bit rate detection

Other
• Stand-alone decoder
• Internal EEPROM for transmitter storage
• Synchronous serial interface
• 1 Kbit user EEPROM
• 14-pin DIP/SOIC package

Typical Applications
• Automotive remote entry systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage openers
• Electronic door locks
• Identity tokens
• Burglar alarm systems