Two Cylinder Small Engine Control IC

The 33814 is an engine control analog power IC intended for two cylinder motorcycle and other small engine control applications. The IC consists of six integrated low side drivers, three pre-drivers, a Variable Reluctance Sensor (VRS) input circuit, a voltage pre-regulator using an external pass transistor, and two 5 volt internal regulators, one for the microcontroller unit (MCU) VCC supply, and one for use as a protected sensor supply.

FEATUREs:
• Operates over supply voltage range of 4.5 V  VPWR  36 V
• Logic stability guaranteed down to 2.5 V
• Two fuel injector drivers - typical of 1.3 A each
• Two Ignition IGBT or general purpose gate pre-drivers
• One O2 sensor (HEGO) heater general purpose gate pre-driver
• Relay 1 driver, typically 2.0 A, can be used for fuel pump control
• Relay 2 driver, typically 1.0 A, can be used as power relay control
• Lamp driver, typically 1.0 A can also be used to drive an LED
• VPROT protected sensor supply tracks VCC +5.0 V regulator
• MCU reset generator - system integrity monitor (watchdog)
• VPP pre-regulator provides power for VCC and VPROT regulators
• Independent fault protection with all faults reported via the SPI
• ISO 9141 K-line interface for communicating diagnostic messages
• Start-up / shut-down control and power sequence logic
• Interfaces directly to MCU using a 5.0 V SPI and logic I/O
• Differential / single-ended VRS conditioning circuit with auto/manual selected thresholds and filter times with digital and tachometer outputs

APPLICATIONs
Small Engine Control for:
• Lawn Mowers
• Motor Scooters
• Small Motorcycles
• Lawn Trimmers
• Snow Blowers
• Chain Saws
• Gasoline-driven Electrical Generators
• Outboard Motors