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Integrated reference solution for OBD2 with CDI that uses standardized digital communications port to provide real-time data




Capacitive Discharge Ignition (CDI) is used widely in small Petrol/Gasoline Engines for generating precise spark timings. This method of ignition employs the capacitor for storing the energy and discharges it into EHT coil which generates high voltage across the spark plug and generates the spark for combustion. Precise spark timings will ensure the proper combustion of air-fuel mixture to maximize the fuel efficiency and power of the particular engine as well as to meet the emission norms and regulations. CDI is widely used in Automobile engines, Small AC/DC Generator, Lawn movers, etc.



On-Board Diagnostics (OBD) is an automotive term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or repair technician access to the status of the various vehicle subsystems. Modern OBD means OBD2 implementations use a standardized digital communications port to provide real-time data in addition to a standardized series of diagnostic trouble codes, or DTCs, which allow one to rapidly identify and remedy malfunctions within the vehicle. It also provides almost complete engine control.




R5F10BAC (RL78/F13 Family)

Industry’s lowest power automotive grade single chip 16 bit microcontroller

Ignition Control

Dual spark CDI


On Board Diagnosis-II using CAN ISO standard protocols

Power Supply Protection

High voltage (Max 350V) and short circuit protection


Value of tilt position of Y- axis


CAN communication is used for diagnostic communication through OBD2 connector

Power Supply

12 V (automotive battery), high voltage (Max 35V) and short circuit protection, reverse polarity protection, over voltage protection


Other features include RPM Sensing, Speed Sensing, Ignition Sensing, Temperature Sensing, Throttle Sensing, Choke Control, MIL Control and CAN communication interface. CAN messages via OBD2 connector could be transmitted via Bluetooth to an smartphone application that is available for download.


System Block Diagram

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