HCS473_13 Datasheet, PDF (1/68 Pages) Microchip Technology – KEELOQ® 3-Axis Transcoder

HCS473
KEELOQ® 3-Axis Transcoder
FEATURES
Encoder Security
• Read protected 64-bit encoder key
• 69-bit transmission length
• 60-bit, read protected seed for secure learning
• Programmable 32-bit serial number
• Non-volatile 16/20-bit synchronization counter
Encoder Operation
• 2.05V to 5.5V operation
• Four switch inputs – up to 15 functions codes
• PWM or Manchester modulation
• Selectable Baud Rate (416 - 5,000 bps)
• Transmissions include button queuing information
• PLL interface
Transponder Security
• 2 read protected 64-bit Challenge/Response keys
• Two IFF encryption algorithms
• 16/32-bit Challenge/Response
• Separate Vehicle ID and Token ID
• 2 vehicles supported
• CRC on all communication
Transponder Operation
• Three sensitive transponder inputs
• Bi-directional transponder communication
• Transponder in/RF out operation
• Anticollision of multiple transponders
• Intelligent damping for high Q-factor LC-circuits
• Low battery operation
• Passive proximity activation
• 64-bit secure user EEPROM
• Fast reaction time
Peripherals
• Low Voltage Detector
• On-board RC oscillator with 10% variation
Package Types
PDIP, SOIC
S0 1
S1 2
S2 3
S3/RFEN 4
VDDT 5
LCX 6
LCY 7
14 VDD
13 LED
12 DATA
11 VSS
10 VSST
9 LCCOM
8 LCZ
Block Diagram
Low
Voltage
Detector
Internal
Oscillator
RESET and ^VDD
EEPROM Power
Control
VSS
S0
S1
S2
S3/
RFEN
Wake-up
Control
Control
Logic
LED
Driver
LED
Data
DATA
Output
LCX
LCY
LCZ
3 Input Transponder
Circuitry
VDDT
LCCOM
VSST
Typical Applications
• Passive entry systems
• 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
• Passive proximity authentication
 2000-2013 Microchip Technology Inc.
Preliminary
DS40035D-page 1