HCS412 Datasheet, PDF (1/44 Pages) Microchip Technology – KEELOQ Code Hopping Encoder and Transponder

HCS412
KEELOQ^® Code Hopping Encoder and Transponder
FEATURES
Security
• Programmable 64-bit encoder crypt key
• Two 64-bit IFF keys
• Keys are read protected
• 32-bit bi-directional challenge and response using
one of two possible keys
• 69-bit transmission length
• 32-bit hopping code,
• 37-bit nonencrypted portion
• Programmable 28/32-bit serial number
• 60-bit, read protected seed for secure learning
• Two IFF encryption algorithms
• Delayed counter increment mechanism
• Asynchronous transponder communication
• Transmissions include button Queuing
information
Operating
• 2.0V to 6.3V operation
• Three switch inputs: S2, S1, S0 – seven functions
• Battery-less bi-directional transponder capability
• Selectable baud rate and code word blanking
• Automatic code word completion
• Battery low detector
• PWM or Manchester data encoding
• Combined transmitter, transponder operation
• Anticollision of multiple transponders
• Passive proximity activation
• Device protected against reverse battery
• Intelligent damping for high Q LC-circuits
• 100 mVPP sensitive LC input
Typical Applications
• Automotive remote entry systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage openers
• Electronic door locks (Home/Office/Hotel)
• Burglar alarm systems
• Proximity access control
PACKAGE TYPES
PDIP, SOIC
S0 1
S1 2
S2/RFEN/LC1 3
LC0 4
8 VDD
7 LED
6 DATA
5 GND
BLOCK DIAGRAM
VDD
Power
Control
Oscillator
Configuration Register
S0
Debounce
Address
Decoding
EEPROM
S1
Wake-up
Control
Logic
and
Queuer
LED
LED
Control
LC0
RFEN/S2/LC1
DATA
DATA
Driver
PPM
Detector
DATA
PPM
Manch.
Encoder
Other
• Simple programming interface
• On-chip tunable RC oscillator, ± 10%
• On-chip EEPROM
• 64-bit user EEPROM in Transponder mode
• Battery-low LED indication
• Serialized Quick Turn Programming (SQTP^SM )
• 8-pin PDIP/SOIC
• RF Enable output
• ASK and FSK PLL interface option
• Built in LC input amplifier
© 2002 Microchip Technology Inc.
Preliminary
DS41099C-page 1