HCS365T-I/P(2002) View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

HCS365T-I/P
(Rev.:2002)

KEELOQ® Code Hopping Encoder

Microchip Technology 

HCS365

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

Verify

Counter

NOTE: Circled numbers indicate the order of execution.

DS41109D-page 4

Preliminary

© 2002 Microchip Technology Inc.

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