HCS200_11 Datasheet, PDF (1/34 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder 32-bit hopping code

HCS200
KEELOQ® Code Hopping Encoder
FEATURES
Security
• Programmable 28-bit serial number
• Programmable 64-bit crypt key
• Each transmission is unique
• 66-bit transmission code length
• 32-bit hopping code
• 28-bit serial number, 4-bit button status,
low battery indicator transmitted
• Crypt keys are read protected
Operating
• 3.5–13.0V operation
• Three button inputs - seven functions available
• Selectable baud rate
• Automatic code word completion
• Low battery signal transmitted to receiver
• Non-volatile synchronization data
Other
• Easy to use programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pull-down resistors
• Low external component cost
Typical Applications
The HCS200 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
• Fixed code replacement
• Automotive RKE systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage door openers
• Identity tokens
• Burglar alarm systems
DESCRIPTION
The HCS200 from Microchip Technology Inc. is a code
hopping encoder designed primarily for Remote Key-
less Entry (RKE) systems. The device utilizes the
KEELOQ® code hopping technology, incorporating high
security, a small package outline and low cost. The
HCS200 is a perfect replacement of fixed code devices
in unidirectional remote keyless entry systems and
access control systems.
PACKAGE TYPES
PDIP, SOIC
S0 1
S1 2
S2 3
NC 4
8 VDD
7 NC
6 PWM
5 ^VSS
BLOCK DIAGRAM
Oscillator
RESET circuit
Controller
Power
latching
and
switching
PWM
EEPROM
Encoder
32-bit shift register
Vss
Button input port
VDD
S2 S1 S0
The HCS200 operates over a wide voltage range of
3.5 volts to 13.0 volts and has three button inputs in an
8-pin configuration. This allows the system designer
the freedom to implement up to seven functions. The
only components required for device operation are the
buttons and RF circuitry, allowing a very low
system cost.
© 2011 Microchip Technology Inc.
DS40138D-page 1