Freescale's MM912_S812 is a S12XS MCU and multi-function ignition and fuel injector drive system. SiP integrates an MCU (S12XS) and an analog control chip (MC33812) specifically designed for motorcycle and other single/double cylinder small engine control applications. Operating range 4.7 V ≤ VPWR ≤ 36 V, relay/ignition/oil pump driver current 4A, lamp drive current 1.5 A, ISO-9141 K-line transceiver for communication diagnostics. This article introduces the main features of the MM912_S812, MC9S12XS series block diagram and 33812 to simplify the internal block diagram, MM912_S812 detailed application block diagram and small engine reference design KIT912S812ECUEVM main features and system establishment diagram, small motorcycle engine control system block diagram, reference design board KIT912S812ECUEVM system block diagram, circuit diagram, BOM and layout of PCB components. The MCU S12XS has 8.0 KB or 12 KB RAM, and flash memory size of The MM912_S812 is an engine control IC combining an MCU (S12XS) and analog control die (MC33812) intended for motorcycle and other single/dual cylinders small engine control applications. 128 KB or 256 KB. The S12XS family retains many of the features of the S12XE family including error correction code (ECC) on flash memory, a separate data-flash module for code or data storage, a separate, controlled and locked loop (IPLL) that Improve the EMC performance and a fast ATD converter. MM912_S812 main features: •Designed to operate over the range of ~4.7 V ≤ VPWR ≤ 36 V • 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 overcurrent •VCC voltage pre-regulator provides +5.0 V power for the MCU • MCU watchdog timer circuit with parallel refresh/time setting line • ISO-9141 K-Line transceiver for conducting diagnostic messages Figure 1. MC9S12XS Series Block Diagram Figure 2.3382 Simplified internal block diagram Figure 3. Simplified application block diagram of the MM912_S812 Figure 4. Detailed application block diagram of MM912_S812 Small Engine Reference Design KIT912S812ECUEVM This product was designed to be a complete solution for the electronic control of a small engine. Small engines are defined as a one or two cylinder engine for use in anything from a motorbike to a lawn mower a generator. While the decision was made to address a one-cylinder engine specifically, this design is extremely useful for a two-cylinder engine with little or no modification. Freescale's concept of creating an engine control kit is intended to enable a From garage hobbyist to seasoned Tier 1 Powertrain Engineer using Freescale products. Through the use of this kit, you can create an engine controller specific to a small engine application. Engine control is a discipline that requires intimate knowledge and experience in Chemical, Mechanical, and Electrical Engineering. For those familiar with mechanical control of an engine through a carburetor, the use of this reference design kit can help to advance your knowledge in the electrical area and provide a jump-start for a successful adoption of electrical engine controls to meet new emissions standards. Providing a kit such as this is intended to make Semiconductor products from Freescale easier to use. The user is responsible for providing all input signals, output loads as a completed system design and development. This kit should serve as a starting point for the development of an application specific engine controller for a small Engine. Example software and documentation are provided to assist in successful design and implementation. It is recomm Ended to have the following skills and experience: embedded C-language programming, analog and digital circuit design and schematic analysis, microcontroller programming, fuel injection system debugging and calibration, and engine test environment experience. additional, there is further benefit to experiencing the CodeWarrior Development Studio and the Freescale S12X microcontroller Units (MCUs). The User Reference Manual provides exercises and references to additional information to reduce the learning curve for inexperienced users. The freescale's goal is to enable the small engine market. To clarify this point, the hardware included in this kit can easily be configured and reprogrammed to run an engine. However, it lacks the application specific hardening (EMC, ESD, and environmental areas for example ] and implementation optimization that make it a production ready module for any specific application. Further, the free example application software providing is a starting point capable of running an running an engine. It does not apply any advanced control strategy capable of addressing the pollution concerns and regulations The the application software does show how to use the Functionality in the Freescale products that the kit is based on, which speeds up the development process by showing a working example. The contents of this kit will save many months of work, even for experienced powertrain engineers just looking to evaluate Freescale products. A system has been created based on one one-cylinder closed-loop engine controller using integrated technology while being cost-effective for the Finally, information on modifying the design to support the adaptation of a small engine market. Example software is provided that can be customized to run an actual engine that has been electronic fuel injection. Documentation is provided to aid in going through the process of developing an application. The small engine reference design to your application goals. Figure 5. Outline drawing of the reference design board KIT912S812ECUEVM The reference design KIT912S812ECUEVM includes: •Assembled and tested KIT912S812ECUEVM board in anti-static bag. ECU wire harness • USB BDM Tool • 6-pin ribbon cable • A-to-B USB cable •Warranty card Figure 6. Reference design board KIT912S812ECUEVM building diagram Figure 7. Block diagram of a scooter engine control system Figure 8. Reference Design Board KIT912S812 ECUEVM System Block Diagram and System Load Figure 9. Reference design board KIT912S812ECUEVM circuit diagram (1) Figure 10. Reference design board KIT912S812ECUEVM circuit diagram (2) Figure 11. Reference Design Board KIT912S812ECUEVM Circuit Diagram (3) Figure 12. Reference design board KIT912S812 ECUEVM circuit diagram (4) Figure 13. Reference Design Board KIT912S812ECUEVM Circuit Diagram (5) Figure 14. Reference Design Board KIT912S812ECUEVM PCB Component Layout: Top Layer Figure 15. Reference Design Board KIT912S812ECUEVM PCB Component Layout: Ground Level Reference design board KIT912S812ECUEVM material list: Every year, our Hengstar company will display all the latest new products at online large-scale trade shows, hoping to arouse the interest of distributors, dealers and potential customers. New projects are our company's continuous improvement of existing products or the launch of the latest "new" models. 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