hcs201 Microchip Technology Inc., hcs201 Datasheet
hcs201
Manufacturer Part Number
hcs201
Description
Keeloq Code Hopping Encoder
Manufacturer
Microchip Technology Inc.
Datasheet
1.HCS201.pdf
(28 pages)
Available stocks
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Part Number:
hcs201-I/P
Manufacturer:
MICROCHIP
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Quantity:
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ALTERA
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201
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hcs201/SN
Manufacturer:
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Part Number:
hcs201T-I/SN
Manufacturer:
MICROCHIP
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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 fixed code (28-bit serial number,
• Encryption keys are read protected
Operating
• 3.5V-13V operation
• Three button inputs
• 7 functions available
• Selectable baud rate
• Automatic code word completion
• Battery low signal transmitted to receiver
• Non-volatile synchronization data
Other
• Simple programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pull-down resistors
• Minimum component count
• Synchronous Transmission mode
• Built-in step up regulator
Typical Applications
• The HCS201 is ideal for Remote Keyless Entry
• Automotive RKE systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage door openers
• Identity tokens
• Burglar alarm systems
2001 Microchip Technology Inc.
4-bit button code, 2-bit status)
(2.0V min. using the Step up feature)
(RKE) applications. These applications include:
K
EE
L
OQ
®
Code Hopping Encoder
DESCRIPTION
The HCS201 from Microchip Technology Inc. is a code
hopping encoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS201 utilizes the K
small package outline and low cost. The HCS201 is a
perfect solution for unidirectional remote keyless entry
systems and access control systems.
PACKAGE TYPES
HCS201 BLOCK DIAGRAM
The HCS201 combines a 32-bit hopping code,
generated by a nonlinear encryption algorithm, with a
28-bit serial number and 6 information bits to create a
66-bit code word. The code word length eliminates the
threat of code scanning and the code hopping mecha-
nism makes each transmission unique, thus rendering
code capture and resend schemes useless.
code hopping technology, incorporating high security, a
PDIP, SOIC
DATA
V
V
SS
DD
V
DDB
RESET circuit
S0
S1
S2
Oscillator
EEPROM
3
1
2
4
HCS201
32-bit shift register
Button input port
Controller
S
2
S
V
8
5
7
6
1
DD
S
Encoder
0
V
V
STEP
DATA
DD
SS
DS41098C-page 1
Controller
Step Up
switching
latching
Power
V
and
DDB
EE
STEP
L
OQ
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