TUSB8020BPHPR datasheet(9/44 Pages) TI

9 / 44 page

VBUS

Detect

SuperSpeed Hub

USB 2.0 Hub

Oscilator

Clock

and

Reset

Distribution

Control

Registers

GPIO

I2C

SMBUS

Power

Distribution

VDD33

VSS

GRSTn

SCL/SMBCLK

SDA/SMDAT

SMBUSz/SS_DN2

PWRCTL1/BATEN1

OVERCUR1z

PWRCTL2/BATEN2

OVERCUR2z

PWRCTL_POL/SS_DN1

GANGED/SMBA2/HS_UP

FULLPWRMGMTz/SMBA1/SS_UP

VDD

TEST

TUSB8020B

www.ti.com

SLLSEF6C – JULY 2014 – REVISED JUNE 2017

Product Folder Links: TUSB8020B

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8 Detailed Description

8.1 Overview

The TUSB8020B is a two-port USB 3.0 compliant hub. It provides simultaneous SuperSpeed USB and high-

speed/full-speed connections on the upstream port and provides SuperSpeed USB, high-speed, full-speed,

or low-speed connections on the downstream ports. When the upstream port is connected to an electrical

environment that only supports high-speed or full-speed/low-speed connections, SuperSpeed USB

connectivity is disabled on the downstream ports. When the upstream port is connected to an electrical

environment that only supports full-speed/low-speed connections, SuperSpeed USB and high-speed

connectivity are disabled on the downstream ports.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Battery Charging Features

The TUSB8020B provides support for battery charging. Battery charging support may be enabled on a per port

basis through the REG_6h(batEn[1:0]).

Battery charging support includes both charging downstream port (CDP) and dedicated charging port (DCP)

modes. The DCP mode is compliant with the Chinese Telecommunications Industry Standard YD/T 1591-2009.

In addition to standard DCP mode, the TUSB8020B provides a mode (AUTOMODE) which automatically

provides support for DCP devices and devices that support custom charging indication. AUTOMODE is enabled

by default. When in AUTOMODE, the port automatically switches between a divider mode and the DCP mode

depending on the portable device connected. The divider mode places a fixed DC voltage on the ports DP and

DM signals which allows some devices to identify the capabilities of the charger. The default divider mode

indicates support for up to 5 W. The divider mode can be configured to report a high-current setting (up to 10 W)

through REG_Ah(HiCurAcpModeEn). When AUTOMODE is enabled, the CDP mode is not functional. CDP

mode can not be used when AUTOMODE is enabled.

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