HCS361 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

HCS361

KEELOQ® Code Hopping Encoder

Microchip Technology 

HCS361

FIGURE 1-2:

BUILDING THE TRANSMITTED CODE WORD (ENCODER)

EEPROM Array

Crypt Key

Sync Counter

Serial Number

KEELOQ®

Encryption

Algorithm

Button Press

Information

Serial Number

32 Bits

Encrypted Data

Transmitted Information

FIGURE 1-3:

BASIC OPERATION OF RECEIVER (DECODER)

1 Received Information

Button Press

Information

Serial Number

32 Bits of

Encrypted Data

EEPROM Array

Manufacturer Code

2

Check for

Match

Perform Function

5

Indicated by

button press

3

KEELOQ®

Decryption

Algorithm

Decrypted

Synchronization

Counter

Serial Number

Sync Counter

Crypt Key

4

Check for

Match

NOTE: Circled numbers indicate the order of execution.

DS40146F-page 4

© 2011 Microchip Technology Inc.

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