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AS1123
Datasheet - D e t a i l e d D e s c r i p t i o n
Detailed Open-LED Error Report
The detailed open-LED error report can be read out immediately after global error mode has been run. SDI must be 1 for the first device.
Figure 15. Detailed Open-LED Error Report Timing Diagram
OEN
Global Flag Readout
t TESTING
t H(L)
Detailed Error Report Readout
LD
t SU(ERROR)
t GSW(ERROR)
t P4
CLK
t GSW(ERROR)
t GSW(ERROR)
SDI
t SW(ERROR)
DBit15
DBit14 DBit13 DBit12 DBitn
DBit2
DBit1
DBit0
Don’t
Care
New Data Input
SDO
T Flag
O Flag
OBit15 OBit14 OBit13 OBit12 OBitn
OBit2
OBit1
OBit0
Don’t
Care
t P4
Open Error Report Output
t P1
For detailed timing information see Timing Diagrams on page 8 .
Detailed Open-LED Error Report Example:
Consider a case where three AS1123s are cascaded in one chain. A 1 indicates a LED is on, a 0 indicates a LED is off, and an X indicates an
open LED. The open-LED test is only applied to LEDs that are turned on. This test is used with a test pattern where all LEDs are on at test time.
IC1:[1111111111111111] IC2:[111XX11111111X11] IC3:[1111111111111111]
IC2 has three open LEDs switched on due to input. 3*16 clock cycles are needed to write the entire error code out. The detailed error report
would look like this:
Input Data:
LED Status:
1111111111111111
1111111111111111
1111111111111111
111XX11111111X11
11111111 11111111
11111111 11111111
Failure Code: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1110011111111011
111111 1111111111
Comparing this report with the input data indicates that IC2 is the device with two open LEDs at position 4 and 5 and one open LED at position
14. For such a test it is recommended to enter low-current diagnostic mode first (see Low-Current Diagnostic Mode on page 14) to reduce screen
flickering.
This test can be used also on-the-fly without using an all 1s test pattern (see Figure 19 on page 16) .
Note: In an actual report there are no spaces in the output. LEDs turned off during test time cannot be tested and will show a logic 1 in the
detailed error report.
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
13 - 24
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