USB7252TSLASHKDX datasheet(42/65 Pages) MICROCHIP

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USB7252

DS00002736D-page 42

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2018 - 2020 Microchip Technology Inc.

8.6

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 v1.0) device protocol, which is a sub-

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

drivers 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 Hub Feature Controller device in the hub.

The USB7252 has two internal USB devices. The Multi-Host Endpoint Reflector is a Composite iAP and NCM device.

The Hub Feature Controller is a Generic USB Device Class 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 “USB7202/

USB725x Multi-Host Endpoint Reflector Operation”, which can be found on the Microchip USB7252 product page at

www.microchip.com/USB7252.

8.7

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 USB7202 and USB725x Hubs”, which can be found on the Microchip USB7252 product page at

www.microchip.com/USB7252.

8.8

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.

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:

• Configure I2C Pass-Through Interface

• I2C Write

• I2C Read

For detailed information on utilizing the USB to I2C bridging feature, refer to the application note “USB to I2C Bridging

with Microchip USB7202 and USB725x Hubs”, which can be found on the Microchip USB7252 product page at

www.microchip.com/USB7252.

8.9

USB to SPI Bridging

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

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

standalone USB to SPI device is implemented.

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:

• Enable SPI Pass-Through Interface

• SPI Write/Read

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