Analog, Mixed Signal and Power Management MC33812 Multifunctional Ignition and Injector Driver Overview With increasing gas prices and worldwide emissions regulations, small engine applications face increasing pressure to be green. In the automotive industry, Freescale has been on the forefront of the change from mechanical to electronic engine control. We are now leading the way to make this change in the small engine industry as well. 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, 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 another injector or fuel pump. The predriver is intended to drive either an Insulated Gate Bipolar Transistor (IGBT) or a bipolar Darlington transistor to control an ignition coil. MC33812 Simplified Application Drawing Applications • • • • • Small Engine Control Lawn Mowers Scooters Small Motorcycles Lawn Trimmers • • • • Snow Blowers Chain Saws Gas-driven Electrical Generators Outboard Motors 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/injector/fuel pump driver - current limit - 4.0 A typical • Lamp driver- current limit - 1.5 A typical • All external outputs protected against short to battery and over-current • All drivers protected against overtemperature • 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, injection and relay • ISO-9141 K-Line transceiver for communicating diagnostic messages • Pb-free packaging designated by suffix code EK Benefits • Increased fuel efficiency when converting from a mechanical system to an electrical system • Improved emissions using electrical system of this IC compared to a mechanical system • Easiest way to interface a micro controller to DC loads • Simplified system design • Reduced board space • Reduce number of components • Enhanced reliability Performance Performance Typical Values Outputs 3 Drivers, 2 Pre-drivers, 1 Bidirectional RDSON @ 25°C 0.2Ω Operating Voltage -0.3 to 45 V Continuous Current 2.0 A for Injector Drivers (1.0A for lamp drivers) Control Parallel ESD, HBM ±2000V Operating Temperature (TA) -40°C to +125°C Junction Operating Temperature (TJ) -40°C to +150°C Protection Protection Detect Over-voltage z Over-current/SC z Over-temperature z Open Load z Limiting z Shut Down Auto Retry z z z z Status Reporting z z z z Simplified Internal Block Diagram VPWR VCC TM_EN ~50 µA LOGIC CONTROL TEST1 TEST2 IGNSUP Ignition IGNFB Pre-driver Band Gap Oscillator Bias TEST3 ~50 µA INJIN VCCREF VCCSENS VPWR, VCC V10.0 Analog V2.5 Logic POR, over-voltage under-voltage IGNOUTH Short Protection IGNOUTL Relay and Injector Output INJOUT PGND1 VCC ~50 µA Gate Control ~50 µA INJFLT IGNIN ~50 µA VCC VCC ~50 µA PARALLEL CONTROL VClamp Current Limit Temperature Limit Short Protection Open det. on Injector ROUT PGND2 + – ~50 µA IGNFLT ~75µA RS lLimit RIN RELFLT Lamp Output LAMPIN ~50 µA Gate Control ~50 µA RESET WATCHDOG (Open Drain) Current Limit Temperature Limit Short Protection ~50 µAVCC MTX VClamp + – WDRFSH ~50 µA LAMPOUT RS lLimit GND ISO9141 CONTROLLER VCC MRX DGND ~50 µA ~50 µA *Note: Pull up and pull down current sources are ~50 µA unless otherwise noted ISO9141 WD_INH Why you need Freescale! • Are you designing an application for a small engine? • Is your local government planning to issue environmental regulations regarding small engines? • Are you planning to move from a mechanical to an electrical engine control system? • Do you need a reference design for a transition from mechanical to an electrical engine control system? • Are you limited for space in your current electronically controlled small engine? • Are you looking to consolidate/integrate multiple functions into a single IC? Ordering Information Part Number Temperature Range Package MCZ33812EK/R2 -40°C to +125°C 32 SOICW-EP * MCZ33812AEK/R2 -40°C to +125°C 32 SOICW-EP Development Tools Part Number Description KIT33812EKEVBE Evaluation Board Kit KIT33812ECUEVME Reference Design with BDM multi-link Contact Sales for Evaluation Kit Availability Document Number Title Description MC33812 Data Sheet Presents the specifications for the product SG187 Selector Guide Automotive Selector Guide SG1002 Selector Guide Analog and Mixed Signal Selector Guide * Note: AEC qualified for automotive applications 32 SOICW-EP 0.65 mm Pitch 11.0 mm x 7.5 mm Body 4.7 mm x 4.7 mm Exposed Pad Learn More: For current information about Freescale products, please visit www.freescale.com. Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc., 2009 - 2010 All rights reserved. Document Number: MC33812FS, Rev 3.0, 8/2010