AS1110-BSST Ver la hoja de datos (PDF) - austriamicrosystems AG

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AS1110-BSST

Constant-Current, 16-Channel LED Driver with Diagnostics

austriamicrosystems AG 

AS1110

Datasheet - Detailed Description

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

LD

CLK

Global Flag Readout

Detailed Error Report Readout

tTESTING

tSU(ERROR)

tGSW(ERROR)

tGSW(ERROR)

tH(L)

tP4

SDI

tGSW(ERROR)

tSW(ERROR)

DBit15 DBit14 DBit13 DBit12 DBitn DBit2 DBit1 DBit0

New Data Input

Don’t

Care

SDO

TFlag

OFlag

tP4

For detailed timing information see Timing Diagrams on page 9.

OBit15 OBit14 OBit13 OBit12 OBitn OBit2 OBit1 OBit0

Open Error Report Output

tP1

Don’t

Care

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:

Input Data: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

LED Status: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Failure Code: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

1111111111111111

1 1 1 XX1 1 1 1 1 1 1 1 X1 1

1110011111111011

1111111111111111

1111111111111111

1111111111111111

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 15) 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 17).

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.

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Revision 1.04

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