HCS360-I/SN

Specialized ICS Overview

The HCS360-I/SN is a KEELOQ code hopping encoder manufactured by Microchip Technology, housed in an 8-SOIC surface-mount package. It operates within a voltage range of 2.0V to 6.6V and features four button inputs supporting up to 15 distinct functions. The device generates a unique 67-bit transmission stream for each activation, combining a 32-bit encrypted hopping code with a fixed portion containing the serial number and status bits. Internal EEPROM stores a programmable 64-bit encryption key, synchronization counters, and configuration data, ensuring high security against code grabbing or scanning attacks.

Specialized ICS Feature Summary

• Utilizes KEELOQ code hopping technology with a 67-bit transmission length (32-bit encrypted hop code + 35-bit fixed code) to prevent code replay attacks.
• Includes on-chip 192-bit EEPROM for storing a read-protected 64-bit crypt key, 28/32-bit serial number, and synchronization values.
• Supports selectable PWM and Manchester modulation formats with configurable baud rates and optional IR modulation mode.
• Features automatic code word completion, battery low signal transmission, and internal pull-down resistors on button inputs.

Specialized ICS Applications

• Automotive Remote Keyless Entry (RKE) systems
• Automotive alarm and immobilizer systems
• Gate and garage door openers
• Burglar alarm systems

Specialized ICS Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the device has been programmed with the necessary manufacturer's code and crypt keys prior to system integration, as the internal EEPROM is read-protected after programming.

Specialized ICS Selection Notes

Select this component for unidirectional remote access applications requiring high security against code cloning. Ensure the receiver decoder supports the selected modulation format (PWM or Manchester) and baud rate settings configured via the internal EEPROM.

Specialized ICS Part Context

The HCS360 is part of the KEELOQ product family designed for secure remote entry. It serves as a cost-effective alternative to previous generations while offering enhanced features such as a 48-bit seed and extended serial number options compared to earlier models like the HCS300.

Specialized ICS Replacement Considerations

Direct pin-compatible replacements within the same series include the HCS360-P (PDIP package). For upgraded functionality, the HCS361 offers additional enhancements such as two seed transmission methods and improved error detection capabilities.

Specialized ICS FAQ

How does the HCS360 prevent code grabbing?

It uses KEELOQ code hopping technology where the transmitted code changes unpredictably with every button press due to an incrementing synchronization counter, making recorded codes invalid for future use.

What is the maximum number of unique transmissions before repetition?

Without overflow tracking, the 16-bit synchronization counter provides over 64,000 unique codes. With the overflow bit enabled, this extends to more than 192,000 unique transmissions.

Can the HCS360 control multiple receivers independently?

Yes, by enabling Independent Mode (IND=1), the device can use separate synchronization counters (SYNC_A and SYNC_B) to control two different receivers simultaneously.