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AS1113

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 AS1113 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 18). LEDs turned off at test time are not tested and will show a logic "1" at the detailed error report.

Figure 18. Normal Operation with Error Detection During Operation – 64 Cascaded AS1113s

Error Detection with Low-Current Diagnosis Mode

This unique feature of the AS1113 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 19).

Figure 19. Low-Current Diagnosis Mode with Internal All 1s Test Pattern – 64 Cascaded AS1113s

Display

SDI

SDO

CLK

OEN

LD

Current

Data1

Data2

Data3

Data2

Data3

Data4

T/O or S Error Code

Data1

T/O or S Error Code

Data0

T/O or S Error Code

Data2

1024x

1024x

1024x

Clock for Error

Mode 0x/1x/2x

Rising Edge of OEN

Acquisition of Error Status

Falling Edge of LD; Error Register is

copied into Shift Register

≤ 50mA

GEF

GEF

GEF = Global Error Flag

Falling Edge of LD; Error Register is

copied into Shift Register

Clock for Error

Mode 0x/1x/2x

Rising Edge of OEN

Acquisition of Error Status

Clock for Error

Mode 1x/2x

3x Clocks Low-

Current Mode

1024x

1024x

Data0

Rising Edge of OEN

Acquisition of Error Status

Falling Edge of LD; Error Register

is copied into Shift Register

GEF

O or S Error Code from

All 1s Test Pattern

Temperature Error Code

Use Internal All 1s

Test Pattern

≤ 50mA

≤ 50mA

SDI

SDO

CLK

OEN

LD

≤ 0.8mA

GEF = Global Error Flag

1024x

Data1

Data2

Data2

Data3

T/O or S Error Code

Data0

GEF

Display

Current

Low-Current Diagnosis Mode

Data1