EVB-USB4X12
EVALUATION BOARD
USER’S GUIDE
2019 Microchip Technology Inc.
DS50002889A-page 9
Chapter 1. Overview
1.1
USB4712/USB4912 GENERAL INTRODUCTION
The USB4712/USB4912 hub controller is a 1-port USB2.0 smart hub controller, which
is fully compliant with the USB2.0 Specification. The 1-port hub supports 480 Mbps
High-Speed (HS), 12 Mbps Full-Speed (FS) and 1.5 Mbps Low-Speed (LS) USB
signaling.
USB4712:
The USB4712 is a 1-port retimer hub with AutoFlexConnect technology.
This hub is design for use within automotive systems which require an attached smart
phone to assume the host role when docked to the automotive head unit system.
AutoFlexConnect technology allows this hub to actively seek for a host connection on
both the default upstream or default downstream port. If a host is detected on the
default downstream port, but no host is detected on the default upstream port, then the
hub will automatically reconfigure itself and initiate FlexConnect to allow the host
detected on the default downstream port to enumerate the hub and any devices
attached to the USB4712 default upstream port. This allows a functional role swap
between the head unit and the smart phone to occur with no direct role swap com
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mands issued to the USB4712. This hub also supports BC1.2 battery charging on the
default downstream port.
USB4912:
The USB4912 is a 1-port hub with Multi-Host Endpoint Reflector technology.
This hub is designed for use within automotive systems which require an attached
smartphone to assume the host role when docked to the automotive head unit system.
With Multi-Host Endpoint Reflector technology, both the automotive head unit and the
smartphone may operate as USB hosts at the same time while exchanging data. A
command issued from the automotive head unit directed to the USB4912’s internal Hub
Feature Controller device is all that is needed to initiate a Multi-Host Endpoint Reflector
session. This hub also supports BC1.2 battery charging on the downstream port. The
USB4912 also has a secondary ‘remote port’ which can be used to daisy chain addi
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tional USB4912 hubs.
The USB4712/USB4912 smart hubs both have an embedded MCU for enabling
advanced features. These features include, hub configuration through upstream USB
interface, USB-to-I
2
C Bridging, USB-to-SPI Bridging, USB-to-GPIO Bridging and more.
1.2
ABOUT EVB-USB4X12
