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Using Hardware
6
6.1
6.2
Using Hardware
This EVB consists of a MC33812 Small Engine Control Circuit, a USB to SPI Dongle interface, power
conditioning circuitry, and a set of Input Select Jumpers. All +5 volt VCC power required by the EVB is
obtained from the MC33812 built-in power regulator.
LED Display
Twelve LED’s are provided as visual output devices for the MC33812 EVB board. A list of the LED
devices is shown below:
1. VPWR LED - Indicates when +12V supply is connected to the EVB.
2. VCC LED - Indicates that the MC33812 internal +5V regulator is running and providing the +5V VCC voltage supply
3. IGNITION LED - Indicates that the Ignition Input, IGNIN, is active and the Ignition Output driver is turned on.
4. LAMP LED - Indicates that the Lamp Input, LAMPIN, is active and the Lamp Output is pulled low.
5. INJECTOR LED - Indicates that the Injector Input, INJIN, is active and the Injector Output is pulled low.
6. RELAY LED - Indicates that the Relay Input, RIN, is active and the Relay Output is pulled low.
7. RESET LED - Indicates that the RESETB output logic level is active (low).
8. INJECTOR FAULT LED - Indicates that there is either a short to Battery, Open Load or other fault on the Injector output.
9. RELAY FAULT LED - Indicates that there is either a short to Battery, Open Load or other fault on the Relay output.
10. IGNITION FAULT LED - Indicates that there is either a short to Battery, Open Load or other fault on the Ignition IGBT output.
11. MRX STATE LED - Indicates the state of the MRX line as a result of the data on the ISO9141 line.
12. USB ON LED - Indicates that the USB SPI dongle is connected properly and is attached to an active USB port on a PC.
Selection Jumper Definitions
The EVB contains four jumpers that provide certain selections for the MC33812 as follows ( Bold = default
factory setting):
6.2.1
JUMPER NAME
WD_INH
WDRFSH
LIN_PWR
IGNITION SUPPLY
WD_INH Jumper
JUMPER POSITION
1-2 / 2-3
OFF/ON
OFF/ON
1 -2 /2 - 3
/ CONNECTION
+5V PU/GND
OPEN/CNTL0
FLOAT/VPWR
VCC/VPWR
The WD_INH is the Watch Dog Inhibit enable/disable setting jumper. With a shorting jumper between pins
1 and 2, the WD_INH pin on the MC33812 is pulled high through a 4.7K resistor to +5 V, causing the
Watch Dog circuit to be disabled. With the shorting jumper between pins 2 and 3, or left off, the WD_INH
pin on the MC33812 is pulled to GND, enabling the Watch Dog circuit.
KIT33812EKEVBE Evaluation Board , Rev. 2.0
Freescale Semiconductor
7
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