HCS410 Datasheet, PDF (2/36 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

HCS410
Table of Contents
1.0 System Overview ....................................................................................................................................................3
1.1 Key Terms ........................................................................................................................................................3
1.2 KEELOQ Code Hopping Encoders .....................................................................................................................4
1.3 KEELOQ IFF ......................................................................................................................................................5
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
DS40158C-page 2
Preliminary
© 1997 Microchip Technology Inc.