Figure 11.
Random pattern 3
Figure 12.
Random pattern 4
2.2
Error detection demonstration
In the error detection demo, the drivers perform open-error detection and short-error detection simultaneously. If a
defective LED is found, it is signaled by lighting the corresponding LED in the row below for an open circuit fault
and on the left for a short-circuit fault.
On the board, open and short-circuit errors are simulated using open and short jumpers, respectively. The
following table shows how each jumper provokes a specific fault, and how the fault is signaled on the LED array.
Table 1.
Error detection jumper table
Jumper
Required action
Fault type
Error in LED
Shown on LED
J7
Place jumper
Short
D30
D26
J8
Place jumper
Short
D31
D27
J9
Place jumper
Short
D32
D28
J10
Remove jumper
Open
D1
D2
J11
Remove jumper
Open
D5
D6
J12
Remove jumper
Open
D9
D10
UM2554
Error detection demonstration
UM2554
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Rev 1
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