Multifunctional Ignition and Injector Driver

The 33812 is an engine control analog power IC intended for motorcycle and other single/dual cylinder small engine control applications. The IC consists of three integrated low side drivers, one pre-driver, a +5.0 V, voltage pre-regulator, an MCU watchdog circuit, an ISO 9141 K-Line interface, and a parallel interface for MCU communication. The three low side drivers are provided for driving a fuel injector, a lamp or LED, and a relay or other load. The pre-driver is intended to drive either an Insulated Gate Bipolar Transistor (IGBT) or a bipolar Darlington transistor to control an ignition coil.

FEATUREs:
• 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, injector and relay drivers
• ISO-9141 K-Line transceiver for communicating diagnostic messages
• Pb-free packaging designated by suffix code EK