AS1109
Data Sheet
Contents
1 General Description ............................................................................................................................. 1
2 Key Features ........................................................................................................................................ 1
3 Applications .......................................................................................................................................... 1
4 Pinout ................................................................................................................................................... 3
Pin Assignments ................................................................................................................................................. 3
Pin Descriptions ................................................................................................................................................... 3
5 Absolute Maximum Ratings ................................................................................................................. 4
6 Electrical Characteristics ...................................................................................................................... 5
Switching Characteristics ..................................................................................................................................... 6
7 Typical Operating Characteristics ........................................................................................................ 7
8 Detailed Description ............................................................................................................................. 8
Serial Interface ..................................................................................................................................................... 9
Timing Diagrams .................................................................................................................................................. 9
Error-Detection Mode ........................................................................................................................................ 11
Global Error Mode ............................................................................................................................................. 11
Error Detection Functions .................................................................................................................................. 12
Open-LED Detection ..................................................................................................................................... 12
Shorted-LED ................................................................................................................................................. 12
Overtemperature ........................................................................................................................................... 12
Detailed Error Reports ....................................................................................................................................... 13
Detailed Temperature Warning Report ......................................................................................................... 13
Detailed Open-LED Error Report .................................................................................................................. 14
Detailed Shorted-LED Error Report .............................................................................................................. 15
Low-Current Diagnostic Mode....................................................................................................................... 15
Shutdown Mode ................................................................................................................................................. 16
9 Application Information ...................................................................................................................... 17
Error Detection ................................................................................................................................................... 17
Error Detection On-The-Fly ........................................................................................................................... 17
Error Detection with Low-Current Diagnosis Mode ....................................................................................... 17
Cascading Devices ............................................................................................................................................ 18
Constant Current ................................................................................................................................................ 19
Adjusting Output Current ................................................................................................................................... 19
Package Power Dissipation ............................................................................................................................... 19
Delayed Outputs ................................................................................................................................................ 19
Switching-Noise Reduction ................................................................................................................................ 19
Load Supply Voltage .......................................................................................................................................... 19
10 Package Drawings and Markings .................................................................................................... 21
11 Ordering Information ........................................................................................................................ 25
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