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 entrysystems and access control systems.

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 LEDoutput

? 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