AS1109-BSOT(2009) データシートの表示（PDF） - austriamicrosystems AG

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AS1109-BSOT
(Rev.:2009)

Constant-Current, 8-Bit LED Driver with Diagnostics

austriamicrosystems AG 

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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