MC33812 and S12P Small Engine Control

A reference design for a fully functional, single-cylinder engine control unit


KIT33812ECUEVME graphic


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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 with 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
    • 1 @ US
    • $240.01
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DornerWorks Ltd. focuses on embedded hardware and software engineering for safety-critical markets.