HCS300

HCS300 Code Hopping Encoder* FEATURES Security Programmable 28-bit serial number Programmable 64-bit encryption key Each transmission is unique 66-bit transmission code length 32-bit hopping code 34-bit fixed code (28-bit serial number, 4-bit button code, 2-bit status) Encryption keys are read protected PACKAGE TYPES PDIP, SOIC S0 S1 S2 S3 1 HCS300 2 3 4 8 7 6 5 VDD LED PWM VSS Operating 2.0—6.3V operation Four button inputs - No additional circuitry required - 15 functions available Selectable baud rate Automatic code word completion Battery low signal transmitted to receiver Non-volatile synchronization data HCS300 BLOCK DIAGRAM Oscillator Reset circuit LED LED driver Controller Power latching and switching EEPROM Other Easy to use programming interface On-chip EEPROM On-chip oscillator and timing components Button inputs have internal pulldown resistors Current limiting on LED output Minimum component count Synchronous transmission mode PWM 32-bit shift register Encoder VSS VDD Button input port Typical Applications The HCS300 is ideal for Remote Keyless Entry (RKE) applications. These applications include: Automotive RKE systems Automotive alarm systems Automotive immobilizers Gate and garage door openers Identity tokens Burglar alarm systems S3 S2 S1 S0 The HCS300 combines a 32-bit hopping code generated by a non-linear encryption algorithm, with a 28-bit serial number and six status bits to create a 66-bit t...