HCS301-/P MICROCHIP [Microchip Technology], HCS301-/P Datasheet
![no-image](/images/no-image-200.jpg)
HCS301-/P
Manufacturer Part Number
HCS301-/P
Description
KEELOQ CODE HOPPING ENCODER
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.HCS301-P.pdf
(30 pages)
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 - 13.0V operation
• Four button inputs
• No additional circuitry required
• 15 functions available
• Selectable baud rate
• Automatic code word completion
• Battery low signal transmitted to receiver
• Battery low indication on LED
• Non-volatile synchronization data
Other
• Functionally identical to HCS300
• Easy-to-use programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pull-down resistors
• Current limiting on LED output
• Low external component cost
Typical Applications
The HCS301 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
• 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)
K
EE
L
OQ
®
Code Hopping Encoder
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
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.
PACKAGE TYPES
HCS301 BLOCK DIAGRAM
The HCS301 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, which incorporates high
PWM
PDIP, SOIC
LED
V
V
SS
DD
S0
S1
S2
RESET circuit
S3
LED driver
Oscillator
EEPROM
HCS301
1
2
3
4
32-bit shift register
Button input port
S3 S2
Controller
S1 S0
Encoder
8
5
6
DS21143B-page 1
7
switching
Power
latching
and
V
V
LED
PWM
DD
SS
EE
L
OQ