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HCS301-/P Datasheet(PDF) 1 Page - Microchip Technology |
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HCS301-/P Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 30 page  © 2001 Microchip Technology Inc. DS21143B-page 1 HCS301 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 Operating • 3.5V - 13.0V operation • Four button inputs • No additional circuitry required • 15 functions available • Selectable baud rate • Automatic code word completion • Battery low signal transmitted to receiver • Battery low indication on LED • Non-volatile synchronization data Other • Functionally identical to HCS300 • Easy-to-use programming interface • On-chip EEPROM • On-chip oscillator and timing components • Button inputs have internal pull-down resistors • Current limiting on LED output • Low external component cost Typical Applications The HCS301 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 DESCRIPTION The HCS301 from Microchip Technology Inc. is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS301 utilizes the KEELOQ code hopping technology, which incorporates high security, a small package outline and low cost, to make this device a perfect solution for unidirectional remote keyless entry systems and access control systems. PACKAGE TYPES HCS301 BLOCK DIAGRAM The HCS301 combines a 32-bit hopping code, generated by a nonlinear encryption algorithm, with a 28-bit serial number and 6 information bits to create a 66-bit code word. The code word length eliminates the threat of code scanning and the code hopping mecha- nism makes each transmission unique, thus rendering code capture and resend schemes useless. 1 2 3 4 8 7 6 5 S0 S1 S2 S3 VDD LED PWM VSS PDIP, SOIC VSS VDD Oscillator RESET circuit LED driver Controller Power latching and switching Button input port 32-bit shift register Encoder EEPROM PWM LED S3 S2 S1 S0 KEELOQ® Code Hopping Encoder |
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