USB7002 datasheet(37/56 Pages) MICROCHIP

37 / 56 page

 2018-2019 Microchip Technology Inc.

DS00002670D-page 37

USB7002

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 power delivery negotiations. For a UFP, the VBUS

comparator is utilized to determine when a DFP is attached or detached. It may also use the comparator to determine

when VBUS is within a new voltage range per power delivery negotiations.

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 3.1 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

Multi-Host Endpoint Reflector

The internal Multi-Host Endpoint Reflector allows for smart-phone automotive mode sessions to be entered on the

downstream ports. The device supports the Multi-Host Endpoint Reflector on downstream ports.

The Multi-Host Endpoint Reflector uses standard Network Control Model (NCM) device protocol, which is a sub-class

of Communication Device Class (CDC) group of protocols. Standard NCM USB drivers may be utilized; No custom driv-

ers are required.

A Multi-Host Endpoint Reflector session may be entered on only 1 downstream port at a time. Entry into Multi-Host mode

is initiated via a no data Control USB transfer addressed to the internal Multi-Host Endpoint Reflector device in the hub.

The USB7002 has two internal USB devices. The Multi-Host Endpoint Reflector is a Composite WinUSB and NCM

device. The Hub Feature Controller is a WinUSB device which enables the USB bridging functions.

The hub ports which are connected to both the Multi-Host Endpoint Reflector and Hub Feature Controller are both con-

figured as non-removable.

For detailed information on utilizing the multi-host endpoint reflector feature, refer to the application note “USB7002/

USB705x Multi-Host Endpoint Reflector Operation

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

www.microchip.com/USB7002.

Note:

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

autonomously by the USB7002.

USB7002 数据表(PDF) 37 Page - Microchip Technology

USB7002 数据表(HTML) 37 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

数据表下载