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Using Hardware
6.2.2
6.2.3
6.2.4
6.2.5
8
WDRFSH Jumper
The WDRFSH jumper provides a connection from the MC33812’s WDRFSH line to the CNTL0 output
from the USB/SPI Dongle interface. The WDRFSH line is the logic input that “Pets” the Watch Dog timer
circuit, preventing it from issuing a RESET signal when the Watch Dog times out Placing a shorting
jumper between pins 1 and 2 connects the CNTL0 signal from the USB/SPI interface to this WDRFSH
pin on the MC33812 circuit. Removing the jumper provides access to the WHDRFSH pin on the MC33812
circuit (on jumper pin 1) to allow other external pulse generators or logic outputs to drive this Watch Dog
reloading input.
LIN_PWR Jumper
The LIN_PWR jumper allows the user to place VPWR on pin 3 of the ISO9141 connector. With a shorting
jumper in place the VPWR supply is connected to pin 3 of the ISO9141 connector. With the jumper
removed, pin 3 of the ISO9141 connector is left floating.
IGNITION SUPPLY Jumper
The MC33812 Ignition Outputs (IGNOUTL and IGNOUTH) are capable of driving either an IGBT
transistor or a Darlington transistor to control a spark coil. The IGNITION SUPPLY selector jumper
connects either the VCC supply or the VPWR supply to the MC33812’s IGNSUP pin to provide the proper
voltage for driving the chosen output transistor type. When a Darlington transistor is being used to drive
the spark coil, the IGNITION SUPPLY Jumper should be placed on pins 1 and 2 to select VCC as the
Ignition Supply, IGNSUP. When an IGBT is the transistor of choice, to drive the spark coil, the IGNITION
SUPPLY Jumper should be placed on pins 2 and 3 (the factory default setting) to select VPWR as the
Ignition Supply Voltage, IGNSUP, to be able to fully enhance the IGBT’s gate.
The factory supplied IGBT can be replaced with a darlington transistor, if desired, however resistors R11
and R13 will need to be changed to provide the additional drive current required by the darlington
transistor.
Input Signal Definitions
The MC33812 has six logic level input signals that are used to control certain outputs or functions inside
the circuit. These six signals are:
1. WDRFSH - Reloads the Watch Dog to prevent issuing a RESET
2. MTX - Provides the transmit data to the ISO9141 line
3. LAMPIN - Controls the state of the LAMPOUT output
4. RIN - Controls the state of the ROUT output
5. IGNIN - Controls the state of the IGNOUTH and IGNOUTL outputs
6. INJIN - Controls the state of the INJOUT output
These six signals are provided by six of the parallel outputs from the USB/SPI interface as described
below:
1. WDRFSH - Connected to the CNTL0 signal
KIT33812EKEVBE Evaluation Board , Rev. 2.0
Freescale Semiconductor
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