AS1109 데이터 시트보기 (PDF) - austriamicrosystems AG
부품명
상세내역
제조사
AS1109 Datasheet PDF : 25 Pages
| |||
AS1109
Datasheet - Detailed Description
8.6.2 Detailed Open-LED Error Report
The detailed open-LED error report can be read out immediately after global error mode has been run.
Figure 16. Detailed Open-LED Error Report Timing Diagram
OEN
LD
CLK
SDI
Global Flag Readout
tTESTING
tSU(ERROR)
tGSW(ERROR)
tGSW(ERROR)
tGSW(ERROR)
tSW(ERROR)
SDO
TFlag
OFlag
tP4
For detailed timing information see Timing Diagrams on page 8.
Detailed Error Report Readout
tH(L)
tP4
DBit7
DBit6 DBit5 DBit4 DBit3 DBit2 DBit1 DBit0
New Data Input
OBit7 OBit6 OBit5 OBit4 OBit3 OBit2 OBit1 OBit0
Open Error Report Output
tP1
Don’t
Care
Don’t
Care
Detailed Open-LED Error Report Example
Consider a case where five AS1109s 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:[11111111] IC2:[111XX111] IC3:[11111111] IC4:[1X111111] IC5:[11111111]
IC2 has two open LEDs and IC4 has one open LED switched on due to input. 5*8 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
LED Status: 1 1 1 1 1 1 1 1
Failure Code: 1 1 1 1 1 1 1 1
11111111
1 1 1 XX1 1 1
11100111
11111111
11111111
11111111
11111111
1 X1 1 1 1 1 1
10111111
11111111
11111111
11111111
Comparing this report with the input data indicates that IC2 is the device with two open LEDs at position 4 and 5 and IC4 with an open LED at
second position. For such a test it is recommended to enter low-current diagnostic mode first (see Low-Current Diagnostic Mode on page 14) to
reduce onscreen flickering.
Note: In an actual report there are no spaces in the output.
LEDs turned off during test time cannot be tested.
www.ams.com/LED-Driver-ICs/AS1109
Revision 1.21
13 - 24
Share Link: 