In
the image above simply click on the chip location for more
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Download
Equivalent Schematic for Eagle-Cad (L1A-L2A.sch)
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The above schematic contains all 8 driver signals. This has been grouped together to make it easier to see the operation of MASTER_ENABLE. The host micro-controller (68HC11A8) converts the serial pulse-width modulated FD signal into 8 parallel injector driver signals. As can be seen MASTER_ENABLE controls all the injector signals. If this signal is false no injector may operate regardless of what the host micro-controller commands. Thus it is very important to understand the operation of this signal.
<<Go Back to Chip Location Reference
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L2, 74HC08 Quad 2-input AND gate |
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Pin # |
Pin Description |
Circuit Configuration |
IDM Function |
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1 |
Gate #1 input |
Driven by (L15-P6) Connected with (L2-P4,9,12) (L1-P1,4,9,12) |
Master Enable |
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2 |
Gate #1 input |
Driven by (L8-P41) |
Fuel Injector 2 Signal |
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3 |
Gate #1 output |
Sink Driver Output |
Fuel Injector 2 |
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4 |
Gate #2 input |
Driven by (L15-P6) Connected with (L2-P1,9,12) (L1-P1,4,9,12) |
Master Enable |
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5 |
Gate #2 input |
Driven by (L8-P39) |
Fuel Injector 3 Signal |
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6 |
Gate #2 output |
Sink Driver Output |
Fuel Injector 3 |
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7 |
GND |
Common GND |
Power GND for device |
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8 |
Gate #3 output |
Sink Driver Output |
Fuel Injector 5 |
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9 |
Gate #3 input |
Driven by (L15-P6) Connected with (L2-P1,4,12) (L1-P1,4,9,12) |
Master Enable |
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10 |
Gate #3 input |
Driven by (L8-P37) |
Fuel Injector 5 Signal |
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11 |
Gate #4 output |
Sink Driver Output |
Fuel Injector 8 |
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12 |
Gate #4 input |
Driven by (L15-P6) Connected with (L2-P1,4,9) (L1-P1,4,9,12) |
Master Enable |
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13 |
Gate #4 input |
Driven by (L8-P35) |
Fuel Injector 8 Signal |
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14 |
VCC |
Common 5VDC |
Power 5VDC for device |