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HCS301 Datasheet

  • HCS301

  • KEELOQ® Code Hopping Encoder

  • 30頁

  • Microchip   Microchip

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HCS301
K
EE
L
OQ
廬
Code Hopping Encoder*
FEATURES
Security
Programmable 28-bit serial number
Programmable 64-bit encryption key
Each transmission is unique
66-bit transmission code length
32-bit hopping code
34-bit 鏗亁ed code (28-bit serial number,
4-bit button code, 2-bit status)
鈥?Encryption keys are read protected
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
PACKAGE TYPES
PDIP, SOIC
S0
S1
S2
S3
1
HCS301
2
3
4
8
7
6
5
V
DD
LED
PWM
V
SS
Operating
鈥?3.5V - 13.0V 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?Battery low indication on LED
鈥?Non-volatile synchronization data
HCS301 BLOCK DIAGRAM
Oscillator
Reset circuit
LED
LED driver
Controller
Power
latching
and
switching
EEPROM
Encoder
Other
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Functionally identical to HCS300
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
Low external component cost
PWM
32-bit shift register
V
SS
V
DD
Button input port
Typical Applications
The HCS301 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Automotive RKE systems
Automotive alarm systems
Automotive immobilizers
Gate and garage door openers
Identity tokens
Burglar alarm systems
S
3
S
2
S
1
S
0
The HCS301 combines a 32-bit hopping code
generated by a non-linear encryption algorithm, with a
28-bit serial number and six status bits to create a
66-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.
The encryption key, serial number, and con鏗乬uration
data are stored in EEPROM which is not accessible via
any external connection. This makes the HCS301 a
very secure unit. The HCS301 provides an easy to use
serial interface for programming the necessary security
keys, system parameters, and con鏗乬uration data.
The encryption keys and code combinations are pro-
grammable but read-protected. The keys can only be
veri鏗乪d after an automatic erase and programming
operation. This protects against attempts to gain
access to keys and manipulate synchronization values.
DESCRIPTION
The HCS301, from Microchip Technology Inc., is a code
hopping encoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS301 utilizes the K
EE
L
OQ
code hopping technology, which incorporates high secu-
rity, a small package outline, and low cost, to make this
device a perfect solution for unidirectional remote key-
less entry systems and access control systems.
KeeLoq is a registered trademark of Microchip Technology Inc.
*Code hopping encoder patents issued for Europe, U. S. A., and R. S. A.
漏
1996 Microchip Technology Inc.
Preliminary
This document was created with FrameMaker 4 0 4
DS21143A-page 1

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