microchip NCS300 free download

File name Hcs300.pdf

HCS300 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 HCS300 from Microchip Technology Inc., is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS300 utilizes the KEELOQ® code hopping technology, which incorporates high 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 PDIP, SOIC S0 S1 S2 S3 1 8 VDD Operating · · · · · · · · 2.0--6.3V operation Four button inputs No additional circuitry required 15 functions available Selectable baud rate Automatic code word completion Battery low signal transmitted to receiver Non-volatile synchronization data HCS300 2 3 4 7 6 5 LED PWM VSS HCS300 BLOCK DIAGRAM Oscillator Reset circuit Controller Power latching and switching Other · · · · · · · Easy to use programming interface On-chip EEPROM On-chip oscillator and timing components Button inputs have internal pulldown resistors Current limiting on LED output Minimum component count Synchronous transmission mode LED LED driver EEPROM Encoder PWM 32-bit shift register Typical Applications VSS The HCS300 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 Button input port VDD S3 S2 S1 S0 2000 Microchip Technology Inc. Preliminary DS21137E-page 1 HCS300 The HCS300 combines a 32-bit hopping code generated by a non-linear encryption algorithm, with a 28-bit serial number and six status bits to create a 66bit transmission stream. The length of the transmission eliminates the threat of code scanning and the code hopping mechanism makes each transmission unique, thus rendering code capture and resend (code grabbing) schemes useless. The encryption key, serial number, and configuration data are stored in EEPROM, which is not accessible via any external connection. This makes the HCS300 a very secure unit. The HCS300 provides an easy to use serial interface for programming the necessary security keys, system parameters, and configuration data. The encyrption keys and code combinations are programmable but read-protected. The keys can only be verified after an automatic erase and programming operation. This protects against attempts to gain access to keys and manipulate synchronization values. The HCS300 operates over a wide voltage range of 2.0V to 6.3V and has four button inputs in an 8-pin configuration. This allows the system designer the freedom to utilize up to 15 functions. The only components required for device operatio