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HCS301_11 Datasheet, PDF (1/38 Pages) Microchip Technology – Microchip Technology Inc. is a code hopping encoder designed for secure | |||
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HCS301
KEELOQ® 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 fixed code (28-bit serial number,
4-bit button code, 2-bit status)
⢠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
DESCRIPTION
The HCS301 from Microchip Technology Inc. is a code
hopping encoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS301 utilizes the
KEELOQ® code hopping technology, which incorpo-
rates high security, a small package outline and low
cost, to make this device a perfect solution for unidirec-
tional remote keyless entry systems and access control
systems.
PACKAGE TYPES
PDIP, SOIC
S0 1
S1 2
S2 3
S3 4
8 VDD
7 LED
6 PWM
5 VSS
HCS301 BLOCK DIAGRAM
Oscillator
RESET circuit
LED
LED driver
Controller
Power
latching
and
switching
PWM
EEPROM
Encoder
32-bit shift register
VSS
VDD
Button input port
S3 S2 S1 S0
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.
© 2011 Microchip Technology Inc.
DS21143C-page 1
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