HCS410 Datasheet, PDF (1/36 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

M
HCS410
Code Hopping Encoder and Transponder*
FEATURES
PACKAGE TYPES
Security
• Two programmable 64-bit encoder keys
• 16/32-bit bi-directional challenge and response
using one of two keys
• 69-bit transmission length
• 32-bit unidirectional code hopping, 37-bit
nonencrypted portion
• Encoder keys are read protected
• Programmable 28/32-bit serial number
• 60/64-bit, read-protected seed for secure learning
• Three IFF encryption algorithms
• Delayed increment mechanism
• Asynchronous transponder communication
• Queuing information transmitted
Operating
• 2.0V to 6.6V operation, 13V encoder only
operation
• Three switch inputs [S2, S1, S0]—seven functions
• Batteryless bi-directional transponder
• Selectable baud rate and code word blanking
• Automatic code word completion
• Battery low signal transmitted
• Nonvolatile synchronization
• PWM or Manchester RF encoding
• Combined transmitter, transponder operation
• Anti-collision of multiple transponders
• Passive proximity activation
• Device protected against reverse battery
• Intelligent damping for high Q LC-circuits
Other
• 37-bit nonencrypted part contains 28/32-bit serial
number, 4/0-bit function code, 1-bit battery low,
2-bit CRC, 2-bit queue
• Simple programming interface
• On-chip tunable RC oscillator (±10%)
• On-chip EEPROM
• 64-bit user EEPROM in transponder mode
• Battery-low LED indication
• SQTP serialization quick-time programming
• 8-pin PDIP/SOIC/TSSOP and die
PDIP, SOIC
S0 1
S1 2
S2/LED 3
LC1 4
8 VDD
7 LC0
6 PWM
5 GND
TSSOP ^{S2/LED 1}
LC1 ²
GND ³
PWM ⁴
8 _S1
7 _S0
6 _VDD
5 _LC0
BLOCK DIAGRAM
VDD
Power
Control
Oscillator
Configuration Register
S0
Debounce
Address
Decoding
EEPROM
S1
Wakeup Control
Logic
and
Queuer
S2
LED
Control
LCI0
LCI1
PWM
PWM
Driver
PPM
Detector
PWM
PPM
Manch.
Encoder
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
KEELOQ is a registered trademark of Microchip Technology Inc.
*Code hopping encoder patents issued in Europe, U.S.A., R.S.A.—U.S.A.: 5,517,187; Europe: 0459781
© 1997 Microchip Technology Inc.
Preliminary
DS40158C-page 1