AN2159 Datasheet, PDF (1/8 Pages) STMicroelectronics – SPI protocol for STPM01/STPM10 metering devices

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Semiconductor Products Sector
Application Note
AN2159
Digital Direct Current Ignition System Using
HC08 Microcontrollers
By Kenny Lam
Applications Engineering
Microcontroller Division
Hong Kong
This application note describes a reference design for an engine electronic
ignition system, known as digital Direct Current Ignition (DCI). The DCI system
is targeted for single-cylinder, two-stroke engines such as mopeds. At the heart
of the system is a Motorola HC08 microcontroller, the MC68HC908JK3.
The text contains a brief overview of the DCI method, and a description of the
demo circuit constructed in the laboratory, using the MC68HC908JK3 as the
controller.
For full MC68HC908JK3 specification, please refer to the data sheet, Motorola
order number: MC68HC908JL3/H.
Introduction
In the past, the two-wheelers industry: scooters, motorcycles, and mopeds,
commonly used an engine ignition system based on the capacitive discharge
method, known as capacitive discharge ignition (CDI) (described in Motorola
application note AN4006/D). The CDI system saves having the battery to
generate the ignition spark and thus prolonging battery life. More recently,
manufacturers are turning to an alternative method for electronic ignition,
known as Direct Current Ignition (DCI).
The DCI method is sometimes called Inductance Direct Ignition (LDI), because
this ignition system uses the battery to supply a DC current to charge an
inductor, and then released as a high voltage pulse via a step-up transformer
to the spark plug to ignite the fuel mixture in the combustion chamber.
Compared with the CDI system, the DCI system reduces the charging
TM
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© Motorola, Inc., 2001