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