AS1109-BQFR austriamicrosystems, AS1109-BQFR Datasheet - Page 14

• Manufacturer Part Number: AS1109-BQFR
• Description: IC LED 4-BIT CC DRIVER 16-QFN
• Manufacturer: austriamicrosystems
• Type: General Purposer

Specifications of AS1109-BQFR

• Constant Current: *
• Constant Voltage: *
• Topology: *
• Number Of Outputs: *
• Internal Driver: *
• Type - Primary: *
• Type - Secondary: *
• Frequency: *
• Voltage - Supply: *
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 16-WQFN
• Operating Temperature: *
• Current - Output / Channel: *
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

AS1109
Datasheet - 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.
Figure 16. Detailed Open-LED Error Report Timing Diagram
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:
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
reduce onscreen flickering.
Note: In an actual report there are no spaces in the output.
www.austriamicrosystems.com/LED-Driver-ICs/AS1109
For detailed timing information see
OEN
SDO
CLK
SDI
LD
LEDs turned off during test time cannot be tested.
Failure Code: 1 1 1 1 1 1 1 1
LED Status: 1 1 1 1 1 1 1 1
Input Data: 1 1 1 1 1 1 1 1
t
GSW(ERROR)
t
TESTING
T
Global Flag Readout
Flag
Timing Diagrams on page
t
t
SU(ERROR)
GSW(ERROR)
t
P4
t
SW(ERROR)
t
GSW(ERROR)
O
Flag
9.
1 1 1 1 1 1 1 1
1 1 1 X X 1 1 1
1 1 1 0 0 1 1 1
t
t
P4
H(L)
DBit7
OBit7
Revision 1.20
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
DBit6
Detailed Error Report Readout
Open Error Report Output
OBit6
DBit5
OBit5
New Data Input
DBit4
OBit4
DBit3
OBit3
1 1 1 1 1 1 1 1
1 X 1 1 1 1 1 1
1 0 1 1 1 1 1 1
(see Low-Current Diagnostic Mode on page 15)
DBit2
OBit2
DBit1
OBit1
DBit0
OBit0
t
P1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
Don’t
Don’t
Care
Care
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