HCS370T-I/SL

The HCS370T-I/SL from Microchip Technology is a secure code hopping encoder utilizing KEELOQ® technology. It is designed for unidirectional authentication and access control systems, offering high security with a small package outline and low cost.

This encoder features programmable 32-bit serial numbers, 64-bit encoder keys, and 60-bit seed values, ensuring each transmission is unique with a 67/69-bit code length and a 32-bit hopping code. The device operates within a voltage range of 2.05V to 5.5V and includes six button inputs, providing 15 functions. It supports various modulation types including PWM, VPWM, PPM, and Manchester.

The HCS370T-I/SL is housed in a 14-SOIC package suitable for surface mounting. Its on-chip EEPROM stores configuration data, which is read-protected to prevent unauthorized access to keys and synchronization values. The device also features an on-chip tuned oscillator with ±10% tolerance over voltage and temperature, and internal pull-down resistors on button inputs.

Typical applications for the HCS370T-I/SL include automotive RKE systems, alarm systems, immobilizers, gate and garage door openers, identity tokens, and burglar alarm systems. Its secure transmission code length helps eliminate threats from code scanning and code grabbing.