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AS3668

Data Sheet - Applications

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