USB7056 datasheet(31/55 Pages) MICROCHIP

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 2022 Microchip Technology Inc. and its subsidiaries

DS00002675F-page 31

USB7056

8.0

FUNCTIONAL DESCRIPTIONS

This section details various USB7056 functions, including:

• Downstream Battery Charging

• Port Power Control

• Power Delivery

• CC Pin Orientation and Detection

• PortSplit

• FlexConnect

• USB to GPIO Bridging

• USB to I2C Bridging

• USB to SPI Bridging

• Link Power Management (LPM)

• Resets

8.1

Downstream Battery Charging

The device can be configured by an OEM to have any of the downstream ports support battery charging. The hub’s role

in battery charging is to provide acknowledgment to a device’s query as to whether the hub system supports USB battery

charging. The hub silicon does not provide any current or power FETs or any additional circuitry to actually charge the

device. Those components must be provided externally by the OEM.

If the OEM provides an external supply capable of supplying current per the battery charging specification, the hub can

be configured to indicate the presence of such a supply from the device. This indication, via the PRT_CTLx pins, is on

a per port basis. For example, the OEM can configure two ports to support battery charging through high current power

FETs and leave the other two ports as standard USB ports.

The port control signals are assigned to programmable pins (PFx) and therefore the device must be programmed into

specific configurations to enable the signals. Refer to Section 3.3.4, PF[31:3] Configuration (CFG_STRAP[2:1]) for addi-

tional information.

For detailed information on utilizing the battery charging feature, refer to the application note “USB Battery Charging

with Microchip USB7002 and USB705x Hubs

”, which can be found on the Microchip USB7056 product page www.micro-

chip.com/USB7056.

Note:

FlexConnect, Mini-host and MHB are not available in the USB7056. The firmware behavior for any of these

commands is undefined.

FIGURE 8-1:

BATTERY CHARGING EXTERNAL POWER SUPPLY

SOC

VBUS[n]

PRT_CTLx

INT

SCL

SDA

Microchip

Hub

DC Power

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