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HCS412_11 Datasheet, PDF (1/52 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder and Transponder Burglar alarm systems | |||
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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 â 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 (SQTPSM )
⢠8-pin PDIP/SOIC
⢠RF Enable output
⢠ASK and FSK PLL interface option
⢠Built in LC input amplifier
© 2011 Microchip Technology Inc.
DS41099D-page 1
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