AS3682

Data Sheet

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Revision 2.21

5 - 43

Table of Contents

1 General Description ................................................................................................................................ 1

2 Key Features .......................................................................................................................................... 1

3 Applications ............................................................................................................................................ 1

4 Block Diagram ........................................................................................................................................ 2

5 Application Diagrams .............................................................................................................................. 2

6 Characteristics ........................................................................................................................................ 6

6.1 Absolute Maximum Ratings (Non-Operating) .................................................................................................. 6

6.2 Operating Conditions ....................................................................................................................................... 6

6.3 Electrical Characteristics ................................................................................................................................. 7

7 Typical Operation Characteristics ........................................................................................................... 9

8 Detailed Functional Descriptions .......................................................................................................... 11

8.1 Charge Pump ................................................................................................................................................ 11

8.1.1 Intelligent Adaptive Mode Switching (IAMS) ....................................................................................... 11

8.1.2 Soft Start ............................................................................................................................................. 11

8.1.3 Open LED Detection ........................................................................................................................... 11

9 Mode Settings ....................................................................................................................................... 12

10 Hard Flash Modes .............................................................................................................................. 14

10.1 Hard Flash Mode 1 ...................................................................................................................................... 15

10.2 Hard Flash Mode 2 ...................................................................................................................................... 17

11 Normal and Soft Flash Modes ............................................................................................................ 19

11.1 Current Settings in Normal Mode ................................................................................................................ 20

11.2 Current Settings in Soft Flash Mode ............................................................................................................ 23

11.5 Charge Pump Control Registers ................................................................................................................. 30

11.6 General Purpose Inputs/Outputs ................................................................................................................. 31

11.7 Power-On Reset .......................................................................................................................................... 32

11.8 Temperature Supervision ............................................................................................................................. 32

11.9 Serial Interface ............................................................................................................................................. 33

11.9.1 Features ............................................................................................................................................ 33

11.9.2 Device Address Selection ................................................................................................................. 33

11.9.3 Data Transfer Formats ...................................................................................................................... 33

11.9.4 Fixed ID Register .............................................................................................................................. 35

11.10 Register Map ............................................................................................................................................. 36

12 External Components ......................................................................................................................... 37

12.1 Capacitor and Resistor Selection ................................................................................................................ 37

12.2 Usage of PCB Wire Inductance ................................................................................................................... 37

12.3 External Component Specifications ............................................................................................................. 37

13 Pinout and Packaging ......................................................................................................................... 38

13.1 Hard Flash Modes Pin Descriptions .............................................................................................................. 38

13.2 Normal Mode and Soft Flash Mode Pin Descriptions .................................................................................. 39

13.3 Package Drawings and Markings ................................................................................................................ 40

14 Ordering Information ........................................................................................................................... 42