DESCRIPTION
The Microchip Technology Inc. HCS512 is a code hopping decoder designed for secure Remote Keyless Entry (RKE) systems. The HCS512 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 keyless entry system.

FEATURES
Security
• Secure storage of Manufacturer’s Code
• Secure storage of transmitter’s keys
• Up to four transmitters can be learned
• KEELOQ® code hopping technology
• Normal and secure learning mechanisms

Operating
• 4.0V – 6.0V operation
• 4 MHz external RC oscillator
• Learning indication on LRNOUT
• Auto baud rate detection
• Power saving SLEEP mode

Other
• Stand-alone decoder
• On-chip EEPROM for transmitter storage
• Four binary function outputs–15 functions
• 18-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