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
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