HCS410

DS40158C-page 2

Preliminary

© 1997 Microchip Technology Inc.

Table of Contents

1.0 System Overview .................................................................................................................................................... 3

1.1 Key Terms ........................................................................................................................................................ 3

2.0 Device Operation .................................................................................................................................................... 6

2.1 Pinout Description ............................................................................................................................................ 7

2.2 Code Hopping Mode (CH Mode) ..................................................................................................................... 8

2.3 Code Hopping Mode Special Features .......................................................................................................... 11

2.4 IFF Mode ........................................................................................................................................................ 14

2.5 IFF Opcodes .................................................................................................................................................. 17

2.6 IFF Special Features ...................................................................................................................................... 18

2.7 LED Indicator ................................................................................................................................................. 18

3.0 EEPROM Organization and Configuration ............................................................................................................ 19

3.1 Encoder Key 1 and 2 ..................................................................................................................................... 19

3.2 Discrimination Value and Overflow ................................................................................................................ 19

3.3 16-bit Synchronization Counter ...................................................................................................................... 19

3.4 60/64-bit Seed Word/Transport Code ............................................................................................................ 20

3.5 Encoder Serial Number .................................................................................................................................. 20

3.6 User Data ....................................................................................................................................................... 20

3.7 Configuration Data ......................................................................................................................................... 21

4.0 Integrating the HCS410 into a System .................................................................................................................. 23

4.1 Key Generation .............................................................................................................................................. 23

4.2 Learning an HCS410 to a Receiver ............................................................................................................... 24

4.3 CH Mode Decoder Operation ........................................................................................................................ 25

4.4 IFF Decoder Operation .................................................................................................................................. 27

5.0 Electrical Characteristics ....................................................................................................................................... 28

HCS410 Product Identification System ........................................................................................................................ 35