Download Datasheets HCS412 Device 
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Home - KEELOQ Authentication Products - Transcoders - HCS412 Device, download datasheet

Download Datasheets HCS412 Device

The HCS370 is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS370 utilizes Microchips patented KEELOQ 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 HCS370 combines a 32-bit hopping code generated by a non-linear encryption algorithm, with a 28/32-bit serial number and 5/3 status bits to create a 69-bit 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 re-send (code grabbing) schemes useless. The encoder key, serial number, and configuration data are stored in EEPROM, which is not accessible via any external connection. This makes the HCS370 a very secure unit. The HCS370 provides an easy-to-use serial interface for programming the necessary security keys, system parameters, and configuration data. The HCS370 operates over a wide voltage range of 2.0V to 5.5V and has four button inputs in an 14-pin configuration. This allows the system designer the freedom to utilize up to 15 functions. Additional features include a PWM, VPWM, PPM, Manchester encoding, an internal tunable oscillator, Step-up voltage regulation, Dual encoder operation, 6 inputs and a Queue counter.

Datasheet and Other Documentation

Detailed Content

Lit. Number



HCS412 Datasheet


Download HCS412 Datasheet


HCS412 Silicon Rev B0 Errata


Download HCS412 Silicon Rev B0 Errata


In Production

Specification Chart

Reception Length Bits

Transmitters Supported

Operating Voltages




2.0V to 6.6V


Additional Features

Encoder, Passive Entry and Transponder

Package Options

8 SOIC 150mil(SN), 8 PDIP(P), 2008-2015 - download datasheets