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AS1123
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Error Detection
The AS1123 features two types of error detection. The error detection can be used on-the-fly, for active LEDs, without any delay, or by entering
into low-current diagnosis mode.
Error Detection On-The-Fly
Error detection on-the-fly will output the status of active LEDs during operation. Without choosing an error mode this will output the temperature
flag at every input/output cycle. Triggering one clock pulse for open or two clock pulses for short detection during error detection mode outputs
the detailed open- or short-error report with the next input/output cycle (see Figure 19) . LEDs turned off at test time are not tested and will show
a logic "1" at the detailed error report.
Figure 19. Normal Operation with Error Detection During Operation – 64 Cascaded AS1123s
Display
SDI
Data1
Data2
Data2
Data3
Data3
Data4
SDO
T/O or S Error Code
Data0
GEF
T/O or S Error Code
Data1
GEF
T/O or S Error Code
Data2
Clock for Error
Clock for Error
CLK
1024x
Mode 0x/1x/2x
1024x
Mode 0x/1x/2x
1024x
OEN
Rising Edge of OEN
Acquisition of Error Status
Rising Edge of OEN
Acquisition of Error Status
LD
Current
Falling Edge of LD; Error Regis-
ter is copied into Shift Register
≤ 40mA
Falling Edge of LD; Error Regis-
ter is copied into Shift Register
GEF = Global Error Flag
Error Detection with Low-Current Diagnosis Mode
This unique feature of the AS1123 uses an internal all 1s test pattern for a flicker free diagnosis of all LEDs. This error detection mode can be
started at the end of each input cycle (see Figure 20) .
Figure 20. Low-Current Diagnosis Mode with Internal All 1s Test Pattern – 64 Cascaded AS1123s
Low-Current Diagnosis Mode
Display
SDI
Data0
Data1
Data1
Data2
Data2
Data3
All 1s Test Pattern
SDO
T/O or S Error Code
Data0
GEF
O or S Error Code from
GEF
GEF
Temperature Error Code
3x Clocks Low- Clock for Error
Current Mode
Mode 1x/2x
CLK
1024x
1024x
1024x
OEN
LD
Rising Edge of OEN
Acquisition of Error Status
Use Internal All 1s Falling Edge LD; Error Register
Test Pattern is copied into Shift Register
Current
≤ 40mA
≤ 0.8mA
≤ 40mA
GEF = Global Error Flag
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
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