MC33812 and S12P Small Engine Control

A Reference Design for a fully functional, single-cylinder engine control unit.


KIT33812ECUEVME graphic


KIT33812ECUEVME Small Engine System Control - Block Diagram

Technical and Functional Specifications


  • Designed to operate over the range of ~4.7 V ≤ VPWR ≤ 36 V
  • Fuel Injector driver - Current Limit - 4.0 A Typical
  • Ignition pre-driver can drive IGBT or Darlington bipolar junction transistors
  • Ignition pre-driver has independent high and low side outputs
  • Relay driver - Current Limit - 4.0 A Typical
  • Lamp driver- Current Limit - 1.5 A Typical
  • All external outputs protected against short to battery, over-current
  • Ignition and other drivers protected against over-temperature
  • Interfaces directly to MCU using 5.0 V parallel interface
  • VCC voltage pre-regulator provides +5.0 V power for the MCU
  • MCU Power On RESET generator
  • MCU watchdog timer circuit with parallel refresh/time setting line
  • Independent fault annunciation outputs for ignition and injection


  • ISO-9141 K-Line transceiver for communicating diagnostic messages


  • KIT33812ECUEVME   Active

  • Reference Design - MC33812 / S12P, Small Engine Control
    • KIT33812ECUEVME
    • 1 @ US
    • $200.01
    • Buy Direct
    • Distributor

Get Started

Start designing a fully functional single cylinder engine control unit using this Reference Design as a starting point.


Design Resources

Multifunctional Ignition and Injector Driver

This data-sheet explains the functions of the MC33812, characteristics among with application diagrams, functional device operation and typical applications.


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