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AS3668

Data Sheet - A p p l i c a t i o n s

Contents

1 General Description

.................................................................................................................................................................. 1

2 Key Features

............................................................................................................................................................................ 1

3 Applications

.............................................................................................................................................................................. 1

4 Pin Assignments

....................................................................................................................................................................... 4

4.1 Pin Description

..................................................................................................................................................................................... 5

5 Absolute Maximum Ratings

...................................................................................................................................................... 6

6 Electrical Characteristics

.......................................................................................................................................................... 7

6.1 Timing Characteristics

.......................................................................................................................................................................... 9

6.2 Timing Diagrams ................................................................................................................................................................................. 10

7 Typical Operating Characteristics ................................................................................................................................................11

8 Detailed Description

............................................................................................................................................................... 14

8.1 Charge Pump

..................................................................................................................................................................................... 14

8.1.1 Charge Pump Mode Switching .................................................................................................................................................. 15

8.1.2 Soft Start .................................................................................................................................................................................... 15

8.1.3 Unused Charge Pump ............................................................................................................................................................... 15

8.1.4 Charge Pump Control Register .................................................................................................................................................. 16

8.2

Current Sources

............................................................................................................................................................................. 16

8.2.1 Unused Current Sources ........................................................................................................................................................... 17

8.2.2 Current Source Registers ........................................................................................................................................................... 18

8.3 Power - On Reset

............................................................................................................................................................................... 19

8.4 VBAT Monitor

..................................................................................................................................................................................... 20

8.4.1 VBAT Monitor Registers . .......................................................................................................................................................... 21

8.5 Temperature Supervision

................................................................................................................................................................... 21

8.6 I²C Serial Interface Bus

...................................................................................................................................................................... 22

8.6.1 I²C Device Address Byte ............................................................................................................................................................ 24

8.6.2 Command Byte .......................................................................................................................................................................... 24

8.6.3 I²C Device Address Selection .................................................................................................................................................... 25

8.7 Operating Modes

................................................................................................................................................................................ 25

8.7.1 GPIO/AUDIO_IN Automatic Pattern Start-up Mode .................................................................................................................. 27

8.8 General Purpose Input / Output

......................................................................................................................................................... 29

8.8.1 Unused General Purpose Input / Output ................................................................................................................................... 30

8.8.2 GPIO Control Register. .............................................................................................................................................................. 30

8.9 Audio Input

......................................................................................................................................................................................... 30

8.9.1 Audio Control Register ............................................................................................................................................................. 32

8.10 LED Pattern Configuration

............................................................................................................................................................... 34

8.10.1 Single Pulse Mode ................................................................................................................................................................... 34

8.10.2 Multiple Pulse Mode ................................................................................................................................................................ 35

8.10.3 Frame Mask Mode ................................................................................................................................................................... 36

8.10.4 Frame Start Delay Mode .......................................................................................................................................................... 37

8.10.5 GPIO Toggle Mode .................................................................................................................................................................. 37

8.10.6 LED Pattern Control Registers ............................................................................................................................................... 38

9 Register Map

........................................................................................................................................................................ 45

10 Application Information

........................................................................................................................................................ 48

10.1 LED Software Implementation Examples

......................................................................................................................................... 48