HCS201

HCS201 KEELOQ® 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 DESCRIPTION The HCS201 from Microchip Technology Inc. is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS201 utilizes the KEELOQ code hopping technology, incorporating high security, a small package outline and low cost. The HCS201 is a perfect solution for unidirectional remote keyless entry systems and access control systems. PACKAGE TYPES PDIP, SOIC S0 S1 S2 VDDB 1 8 VDD STEP DATA VSS Operating 3.5V-13V operation (2.0V min. using the Step up feature) Three button inputs 7 functions available Selectable baud rate Automatic code word completion Battery low signal transmitted to receiver Non-volatile synchronization data HCS201 2 3 4 7 6 5 HCS201 BLOCK DIAGRAM VDDB VDD Other Simple programming interface On-chip EEPROM On-chip oscillator and timing components Button inputs have internal pull-down resistors Minimum component count Synchronous Transmission mode Built-in step up regulator DATA VSS VDD Oscillator RESET circuit Step Up Controller Power latching and switching STEP Controller EEPROM Encoder 32-bit shift register Typical Applications The HCS201 is ideal for Remote Ke...