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Appendix A: Hardware Reference Manual
transients. Specific application requirements should account for the voltage levels and injection methods
that come from the operating environment. No component can guarantee meeting a specification. It takes
a system level implementation with proper coordination of circuit design, component selection, and layout
techniques. This is demonstrated in the reference design by using devices that use the human body
model for ESD ratings of +/-2 kV and having ESD capacitors placed at the connector pins placed as stubs
between the signal and the connector.
10.4.2.4
Relay Driver
The relay driver is an exact twin of the injector driver, and could be used to drive a second injector, in a
two cylinder application. The output pin for the relay driver is ROUT and the input is RIN. There is also a
fault indicator pin called RELFLT and it behaves the same as the INJFLT pin. Refer to the Injector Driver
section for further details.
10.4.2.5
10.4.2.5.1
Lamp Driver
Design Criteria
The lamp driver specifically designed to drive a Malfunction Indicator Lamp (MIL) on a motorcycle or
motor scooter, but could be used for other purposes as well. A MIL is typically an incandescent type of
light but may be LED. Operation of both types must be provided. It is a general purpose light indicating
the health of the engine and does not require any specific timing requirements. Diagnostic of the light itself
is provide on power up and does not require further fault detection of the load itself. A 7.0 W lamp
represents a larger type of load used for a MIL.
10.4.2.5.2
Implementation Recommendations
Integrated into the MC33812 is a low side driver for lamps. It is similar to the injector and relay drivers but
with less current handling capability. It is designed to have an RDSON of 1.0 Ohm, typically, and can
provide up to 1.0 Amp before current limiting. Like the injector and relay drivers, it is protected against
fault conditions, however there is no fault indicator pin associated with this driver. It also has over current
timer to allow for incandescent bulb inrush currents. The output pin is called LAMPOUT and the input pin
is called LAMPIN. The lamp driver can also be used to drive a LED because it does not have a fault
detection current sink on the output which would cause ghost lighting in a LED through leakage current.
Implementing an LED requires proper series resistance for biasing. Provision for PWM dimming is
provided in the reference design by connection of the LAMPIN pin to a PWM output channel of the MCU.
This allows fine tuning of the LED brightness and possibility for ambient light compensation. The lamp
driver also has a voltage clamp of 53 Volts, typically, so it can drive a relay as well as a light.
10.4.2.6
10.4.2.6.1
Ignition Pre-Driver
Design Criteria
The ignition pre-driver is used to drive an external transistor which controls current flow in an inductive
ignition coil. Spark events are then generated by the control of current in the coil. Transistors used to drive
the coil can be either Darlington or Insulated Gate Bipolar Transistor (IGBT) type. Circuit must provide
system health feedback of the ignition coil drive circuit through the detection of faults.
10.4.2.6.2
Implementation Recommendations
The MC33812 ignition pre-driver has two outputs and one input. The IGNOUTH provides the high side
output stage and the IGNOUTL provides the low side output stage. Having both high and low side drive
Small Engine Reference Design User Manual , Rev. 3.0
48
Freescale Semiconductor
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