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DS00001584B-page 3

USB3503

Table of Contents

1.0 General Description ........................................................................................................................................................................ 4

2.0 Acronyms and Definitions ............................................................................................................................................................... 6

3.0 USB3503 Pin Definitions ................................................................................................................................................................. 7

4.0 Modes of Operation ...................................................................................................................................................................... 15

5.0 Configuration Options ................................................................................................................................................................... 19

6.0 Serial Slave Interface .................................................................................................................................................................... 36

7.0 USB Descriptors ........................................................................................................................................................................... 39

8.0 Battery Charging ........................................................................................................................................................................... 48

9.0 Integrated Power Regulators ........................................................................................................................................................ 50

10.0 Specifications .............................................................................................................................................................................. 51

11.0 Application Reference ................................................................................................................................................................. 58

12.0 Package Outlines, Tape & Reel Drawings, Package Marking .................................................................................................... 61

Appendix A: Data sheet Revision History ........................................................................................................................................... 69

The Microchip Web Site ...................................................................................................................................................................... 70

Customer Change Notification Service ............................................................................................................................................... 70

Customer Support ............................................................................................................................................................................... 70

USB3503 25-WLCSP Product Identification System .......................................................................................................................... 71

USB3503 32-SQFN Product Identification System ............................................................................................................................. 71