USB7002 datasheet(36/56 Pages) MICROCHIP

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USB7002

DS00002670G-page 36

 2022 Microchip Technology Inc. and its subsidiaries

VCONN is a 5V supply used to power circuitry in the USB Type-C plug that is required to implement Electronically

Marked Cables. By default the DFP always sources VCONN when connected to an active cable. The USB7002 requires

the use of two external VCONN FETs. The device provides the enables for these FETs, and can detect an OCS by mon-

itoring the output voltage of the FET via the CC pins.

The device also implements a comparator for determining when a VBUS is within a programmed range, vSafe5V or

vSafe0V. VBUS is divided down externally to provide a nominal 3.3V at the VBUS_MON pin. For a DFP, the VBUS com-

parator is useful to detect when VBUS is within the desired range per Type-C VBUS voltage. For a UFP, the VBUS com-

parator is utilized to determine when a DFP is attached or detached.

8.4

FlexConnect

The device allows the upstream port to be swapped with any downstream port, enabling any USB port to assume the

role of USB host at any time during hub operation. This host role exchange feature is called FlexConnect. Additionally,

the USB 2.0 ports can be flexed independently of the USB 3.2 ports.

This functionality can be used in two primary ways:

Host Swapping: This functionality can be achieved through a hub wherein a host and device can agree to swap

the host/device relationship; The host becomes a device, and the device becomes a host.

Host Sharing: A USB ecosystem can be shared between multiple hosts. Note that only 1 host may access to

the USB tree at a time.

FlexConnect can be enabled through any of the following three methods:

• I2C Control: The embedded I2C slave can be used to control the state of the FlexConnect feature through basic

write/read operations.

• USB Command: FlexConnect can be initiated via a special USB command directed to the hub’s internal Hub

Feature Controller device.

• Direct Pin Control: Any available GPIO pin on the hub can be assigned the role of a FlexConnect control pin.

For detailed information on utilizing the FlexConnect feature, refer to the application note “USB7002/USB705x FlexCon-

nect Operation

”, which can be found on the Microchip USB7002 product page at www.microchip.com/USB7002.

8.5

USB to GPIO Bridging

The USB to GPIO bridging feature provides system designers expanded system control and potential BOM reduction.

General Purpose Input/Outputs (GPIOs) may be used for any general 3.3V level digital control and input functions.

Commands may be sent from the USB Host to the internal Hub Feature Controller device in the Microchip hub to per-

form the following functions:

• Set the direction of the GPIO (input or output)

• Enable a pull-up resistor

• Enable a pull-down resistor

• Read the state

• Set the state

For detailed information on utilizing the USB to GPIO bridging feature, refer to the application note “USB to GPIO Bridg-

ing with Microchip USB7002 and USB705x Hubs

”, which can be found on the Microchip USB7002 product page at

www.microchip.com/USB7002.

8.6

USB to I2C Bridging

The USB to I2C bridging feature provides system designers expanded system control and potential BOM reduction. The

use of a separate USB to I2C device is no longer required and a downstream USB port is not lost, as occurs when a

standalone USB to I2C device is implemented.

Note:

The native USB Type-C functionality (including CC pin orientation and detection features) is managed

autonomously by the USB7002.

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