HCS201
KEELOQ® Code Hopping Encoder
FEATURES
Security
• • • • • • Programmable 28-bit serial number Programmable 64-bit ...
HCS201
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
DESCRIPTION
The HCS201 from Microchip Technology Inc. is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS201 utilizes the KEELOQ code hopping technology, incorporating high security, a small package outline and low cost. The HCS201 is a perfect solution for unidirectional remote keyless entry systems and access control systems.
PACKAGE TYPES
PDIP, SOIC
S0 S1 S2 VDDB 1 8 VDD STEP DATA VSS
Operating
3.5V-13V operation (2.0V min. using the Step up feature) Three button inputs 7 functions available Selectable baud rate Automatic code word completion Battery low signal transmitted to receiver Non-volatile synchronization data
HCS201
2 3 4
7 6 5
HCS201 BLOCK DIAGRAM
VDDB VDD
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
DATA VSS VDD Oscillator RESET circuit
Step Up Controller
Power latching and switching
STEP
Controller
EEPROM
Encoder
32-bit shift register
Typical Applications
The HCS201 is ideal for Remote Ke...