DESCRIPTION

The HCS410 is a code hopping transponder device designed for secure entry systems. The HCS410 utilizes the patented KEELOQ® code hopping system and bi-directional challenge-and-response for logical and physical access control. High security learning mechanisms make this a turnkey solution when used with the KEELOQdecoders. The encoder keys and synchronization information are stored in protected on-chip EEPROM.

FEATURES

Security

• Two programmable 64-bit encoder keys

• 16/32-bit bi-directional challenge and response using one of two keys

• 69-bit transmission length

• 32-bit unidirectional code hopping, 37-bit non-encrypted portion

• Encoder keys are read protected

• Programmable 28/32-bit serial number

• 60/64-bit, read-protected seed for secure learning

• Three IFF encryption algorithms

• Delayed increment mechanism

• Asynchronous transponder communication

• Queuing information transmitted



Operating

• 2.0V - 6.6V operation, 13V encoder only operation

• Three switch inputs [S2, S1, S0]—seven functions

• Batteryless bi-directional transponder

• Selectable baud rate and code word blanking

• Automatic code word completion

• Battery low signal transmitted

• Non-volatile synchronization

• PWM or Manchester RF encoding

• Combined transmitter, transponder operation

• Anti-collision of multiple transponders

• Passive proximity activation

• Device protected against reverse battery

• Intelligent damping for high Q LC-circuits



Other

• 37-bit nonencrypted part contains 28/32-bit serial number, 4/0-bit function code, 1-bit battery low, 2-bit CRC, 2-bit queue

• Simple programming interface

• On-chip tunable RC oscillator (±10%)

• On-chip EEPROM

• 64-bit user EEPROM in transponder mode

• Battery-low LED indication

• SQTP serialization quick-time programming

• 8-pin PDIP/SOIC/TSSOP and die

Typical Applications

• Automotive remote entry systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage openers

• Electronic door locks (Home/Office/Hotel)

• Burglar alarm systems

• Proximity access control