HCS500-I/SM

Specialized ICS Overview

The HCS500-I/SM is a KEELOQ code hopping decoder manufactured by Microchip Technology, designed for secure Remote Keyless Entry (RKE) systems. It operates within a voltage range of 3.0V to 5.5V and features an internal oscillator with auto bit-rate detection. The device supports up to seven learned transmitters and utilizes encrypted storage for the manufacturer’s code and crypt keys. Communication with a host controller occurs via a synchronous serial interface using S_DAT and S_CLK pins, while RF reception is handled through the RFIN pin.

Specialized ICS Feature Summary

• Utilizes patented KEELOQ code hopping technology for high security
• Supports Normal and Secure learning mechanisms for up to seven transmitters
• Features encrypted storage of manufacturer's code and crypt keys
• Includes 1 Kbit user EEPROM and auto bit-rate detection

Specialized ICS Applications

• Automotive remote entry systems
• Automotive alarm systems
• Gate and garage openers
• Electronic door locks
• Burglar alarm systems

Specialized ICS Procurement Notes

Verify that the ordering suffix 'I' corresponds to the industrial temperature range (-40°C to +85°C) as specified in the datasheet. Confirm the 'SM' suffix indicates the 8-SOIJ package type. Ensure external EEPROM is selected for storing transmitter data if stand-alone operation is required. Check for RoHS compliance status on current production runs.

Specialized ICS Selection Notes

Select this component when implementing unidirectional remote access control systems requiring KEELOQ encryption. It serves as a standalone decoder or integrates with microcontrollers via synchronous serial interface. Ensure the system design accommodates the 3.0V–5.5V operating voltage and provides necessary power supply supervision to protect EEPROM integrity during brown-out conditions.

Specialized ICS Part Context

The HCS500 belongs to the KEELOQ product family, which includes various encoders and decoders for secure wireless communication. This specific model is a decoder optimized for applications needing robust anti-code-grabbing protection. It complements HCS series encoders that utilize PWM modulation formats and 28-bit serial numbers.

Specialized ICS Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Microchip Technology directly for cross-reference information or updated components within the KEELOQ decoder portfolio.