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User Guide

DS00004761B - 1

Introducon

This document describes the PD77728 register map and register functionality. The PD77728 communication

method is based on I2C, using register access as shown in Figure 1. Each PD77728 includes two consecutive I2C

addresses (a single I2C address controls 4 ports of 2 pairs). The two I2C addresses are set by pins A1–A4, and

each address is 7 bits. The PD77728 device does not require clock stretch support from the host. See the I2C

section in the PD77728 Datasheet to program the I2C address.

Figure 1. I2C Transacons

PD77728 Auto Mode Register Map

User Guide

DS00004761B - 2

Table of Contents

Introduction...........................................................................................................................................................................1

1. Automode Operational Flowchart...............................................................................................................................3

2. Register Map.................................................................................................................................................................. 4

3. Register Functionality................................................................................................................................................... 7

3.1. Event Registers (0x00 to 0x0B)......................................................................................................................... 7

3.2. Status Registers (0x0C to 0x11)........................................................................................................................ 9

3.3. Registers (0x12 to 0x19 and 0x27/0x28).............................................................................. 11Conguration

3.4. General Registers (0x1B and 0x1C)................................................................................................................12

3.5. Specialized Registers (0x24 to 0x2F)..............................................................................................................12

3.6. Port Voltage and Current Measurement Registers (0x30 to 0x3F)............................................................ 14

3.7. Port Inrush Current Control Register (0x40).................................................................................................15

3.8. Firmware Version and Chip ID Registers (0x41 and 0x43).......................................................................... 15

3.9. Port Signature Measurement Registers (0x44 to 0x4B).............................................................................. 15

3.10. Port Status Registers (0x4C to 0x4F)......................................................................................16Classication

3.11. AutoClass Status Registers (0x51 to 0x54)....................................................................................................17

4. Revision History...........................................................................................................................................................18

Microchip Information....................................................................................................................................................... 19

The Microchip Website............................................................................................................................................... 19

Product Change Service........................................................................................................................ 19Notication

Customer Support.......................................................................................................................................................19

Microchip Devices Code Protection Feature............................................................................................................ 19

Legal Notice..................................................................................................................................................................19

Trademarks.................................................................................................................................................................. 20

Quality Management System.....................................................................................................................................21

Worldwide Sales and Service..................................................................................................................................... 22