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HCS361 Datasheet

  • HCS361

  • KEELOQ® Code Hopping Encoder

  • 36頁

  • Microchip   Microchip

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M
FEATURES
Security
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Programmable 28/32-bit serial number
Programmable 64-bit encryption key
Each transmission is unique
67-bit transmission code length
32-bit hopping code
35-bit 鏗亁ed code (28/32-bit serial number,
4/0-bit function code, 1-bit status, 2-bit CRC)
鈥?Encryption keys are read protected
HCS361
Code Hopping Encoder*
PACKAGE TYPES
PDIP, SOIC
S0
S1
S2
S3
1
HCS361
2
3
4
8
7
6
5
V
DD
LED
PWM
V
SS
Operating
鈥?2.0-6.6V operation
鈥?Four button inputs
- 15 functions available
鈥?Selectable baud rate
鈥?Automatic code word completion
鈥?Battery low signal transmitted to receiver
鈥?Nonvolatile synchronization data
鈥?PWM and VPWM modulation
HCS361 BLOCK DIAGRAM
Oscillator
Reset circuit
LED
LED driver
Controller
Power
latching
and
switching
EEPROM
Encoder
Other
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Easy to use programming interface
On-chip EEPROM
On-chip oscillator and timing components
Button inputs have internal pulldown resistors
Current limiting on LED output
Minimum component count
PWM
32-bit shift register
V
SS
V
DD
Button input port
Enhanced Features Over HCS300
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48-bit seed vs. 32-bit seed
2-bit CRC for error detection
28/32-bit serial number select
Two seed transmission methods
PWM and VPWM modulation
Wake-up signal in VPWM mode
IR modulation mode
S
3
S
2
S
1
S
0
DESCRIPTION
The HCS361 is a code hopping encoder designed for
secure Remote Keyless Entry (RKE) systems. The
HCS361 utilizes the K
EE
L
OQ
code hopping technology,
which incorporates high security, a small package
outline and low cost, to make this device a perfect
solution for unidirectional remote keyless entry systems
and access control systems.
The HCS361 combines a 32-bit hopping code
generated by a nonlinear encryption algorithm, with a
28/32-bit serial number and 7/3 status bits to create a
67-bit transmission stream. The length of the
transmission eliminates the threat of code scanning
and the code hopping mechanism makes each
transmission unique, thus rendering code capture and
resend (code grabbing) schemes useless.
Typical Applications
The HCS361 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
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Automotive RKE systems
Automotive alarm systems
Automotive immobilizers
Gate and garage door openers
Identity tokens
Burglar alarm systems
K
EE
L
OQ
is a trademark of Microchip Technology Inc.
*Code hopping encoder patents issued in Europe, U. S. A., R. S. A. 鈥?US: 5,517,187; Europe: 0459781
漏
1996 Microchip Technology Inc.
Preliminary
DS40146C-page 1

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