HCS362T-I/SN

The HCS362 is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS362 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.

The HCS362 combines a 32-bit hopping code generated by a non-linear encryption algorithm, with a 28/32-bit serial number and 9/5 status bits to create a 69-bit transmission stream. The length of the transmission eliminates the threat of code scanning. The code hopping mechanism makes each transmission unique, thus rendering code capture and resend (code grabbing) schemes useless.

The crypt key, serial number and configuration data are stored in an EEPROM array which is not accessible via any external connection. The EEPROM data is programmable but read protected. The data can be verified only after an automatic erase and programming operation. This protects against attempts to gain access to keys or manipulate synchronization values. The HCS362 provides an easy to use serial interface for programming the necessary keys, system parameters and configuration data.

• Security
• Programmable 28/32-bit serial number
• Two programmable 64-bit encryption keys
• Programmable 60-bit seed
• Each transmission is unique
• 69-bit transmission code length
• 32-bit hopping code
• 37-bit fixed code (28/32-bit serial number, 4/0-bit function code, 1-bit status, 2-bit CRC/time, 2-bit queue)
• Encryption keys are read protected Operation
• 2.0V - 6.3V operation
• Four button inputs
• 15 functions available
• Selectable baud rates and code word blanking
• Programmable minimum code word completion
• Battery low signal transmitted to receiver with programmable threshold
• non--volatile synchronization data
• PWM and Manchester modulation Other
• RF Enable output - PLL interface
• Easy to use programming interface
• On-chip EEPROM
• On-chip tunable oscillator and timing components
• Button inputs have internal pull-down resistors