AS1110 AMSCO [austriamicrosystems AG], AS1110 Datasheet - Page 14

• Manufacturer Part Number: AS1110
• Description: Constant-Current, 16-Channel LED Driver with Diagnostics
• Manufacturer: AMSCO [austriamicrosystems AG]

AS1110
Data Sheet - 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 14. Detailed Open-LED Error Report Timing Diagram
Detailed Open-LED Error Report Example
Consider a case where three AS1110s 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:
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
Current Diagnostic Mode on page 15)
This test can be used also on-the-fly without using an all 1s test pattern
Note: In an actual report there are no spaces in the output. LEDs turned off during test time cannot be tested and will
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For detailed timing information see
OEN
SDO
CLK
Failure Code: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
SDI
LD
LED Status: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Input Data: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
show a logic 1 in the detailed error report.
t
GSW(ERROR)
t
TESTING
T
Global Flag Readout
Flag
t
t
SU(ERROR)
GSW(ERROR)
t
P4
Timing Diagrams on page
t
SW(ERROR)
t
GSW(ERROR)
O
to reduce screen flickering.
Flag
9.
t
t
P4
H(L)
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 X X 1 1 1 1 1 1 1 1 X 1 1
1 1 1 0 0 1 1 1 1 1 1 1 1 0 1 1
DBit15
Revision 1.00
OBit15
DBit14
Detailed Error Report Readout
Open Error Report Output
OBit14
DBit13
OBit13
New Data Input
DBit12
OBit12
(see Figure 18 on page
DBitn
OBitn
DBit2
OBit2
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
DBit1
OBit1
DBit0
OBit0
t
P1
17).
Don’t
Don’t
Care
Care
(see Low-
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