USB5734 datasheet(6/61 Pages) MICROCHIP

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USB5734

DS00001854D-page 6

 2015-2016 Microchip Technology Inc.

2.0

INTRODUCTION

2.1

General Description

The Microchip USB5734 hub is low-power, OEM configurable, USB 3.1 Gen 1 hub feature controller with 4 downstream

ports and advanced features for embedded USB applications. The USB5734 is fully compliant with the Universal Serial

Bus Revision 3.1 Specification

and USB 2.0 Link Power Management Addendum. The USB5734 supports 5 Gbps

SuperSpeed (SS), 480 Mbps Hi-Speed (HS), 12 Mbps Full-Speed (FS), and 1.5 Mbps Low-Speed (LS) USB down-

stream devices on all enabled downstream ports.

The USB5734 supports the legacy USB speeds (HS/FS/LS) through a dedicated USB 2.0 hub feature controller that is

the culmination of five generations of Microchip hub feature controller design and experience with proven reliability,

interoperability, and device compatibility. The SuperSpeed hub feature controller operates in parallel with the USB 2.0

controller, decoupling the 5 Gbps SS data transfers from bottlenecks due to the slower USB 2.0 traffic.

The USB5734 enables OEMs to configure their system using “Configuration Straps.” These straps simplify the config-

uration process assigning default values to USB3.1 Gen 1 ports and GPIOs OEMs can disable ports, enable battery

charging and define GPIO functions as default assignments on power up removing the need for OTP or external SPI

ROM.

The USB5734 supports downstream battery charging. The USB5734 integrated battery charger detection circuitry sup-

ports the USB-IF Battery Charging (BC1.2) detection method and most Apple devices. The USB5734 provides the bat-

tery charging handshake and supports the following USB-IF BC1.2 charging profiles:

• DCP: Dedicated Charging Port (Power brick with no data)

• CDP: Charging Downstream Port (1.5A with data)

• SDP: Standard Downstream Port (0.5A with data)

• Custom profiles loaded via SMBus or OTP

The USB5734 provides an additional USB endpoint dedicated for use as a USB to I2C/UART/SPI/GPIO interface, allow-

ing external circuits or devices to be monitored, controlled, or configured via the USB interface. Additionally, the

USB5734 includes many powerful and unique features such as:

FlexConnect

, which provides flexible connectivity options. One of the USB5734’s downstream ports can be reconfig-

ured to become the upstream port, allowing master capable devices to control other devices on the hub.

PortSwap

, which adds per-port programmability to USB differential-pair pin locations. PortSwap allows direct alignment

of USB signals (D+/D-) to connectors to avoid uneven trace length or crossing of the USB differential signals on the

PCB.

PHYBoost

, which provides programmable levels of Hi-Speed USB signal drive strength

in the downstream port transceivers. PHYBoost attempts to restore USB signal integrity

in a compromised system environment. The graphic on the right shows an example of

Hi-Speed USB eye diagrams before and after PHYBoost signal integrity restoration. in

a compromised system environment

VariSense

, which controls the USB receiver sensitivity enabling programmable levels of USB signal receive sensitivity.

This capability allows operation in a sub-optimal system environment, such as when a captive USB cable is used.

The USB5734 can be configured for operation through internal default settings. Custom OEM configurations are sup-

ported through external SPI ROM or OTP ROM. All port control signal pins are under firmware control in order to allow

for maximum operational flexibility, and are available as GPIOs for customer specific use.

The USB5734 is available in commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature ranges. An internal

block diagram of the USB5734 is shown in Figure 2-1.

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