USB7252SLASHKDX datasheet(38/65 Pages) MICROCHIP

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USB7252

DS00002736D-page 38

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2018 - 2020 Microchip Technology Inc.

8.0

FUNCTIONAL DESCRIPTIONS

This section details various USB7252 functions, including:

• Downstream Battery Charging

• Port Power Control

• CC Pin Orientation and Detection

• PortSplit

• FlexConnect

• Multi-Host Endpoint Reflector

• USB to GPIO Bridging

• USB to I2C Bridging

• USB to SPI Bridging

• USB to UART 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[31:2] 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 USB7202 and USB725x Hubs”, which can be found on the Microchip USB7252 product page www.micro-

chip.com/USB7252.

FIGURE 8-1:

BATTERY CHARGING EXTERNAL POWER SUPPLY

SOC

VBUS[n]

INT

SCL

SDA

Microchip

Hub

DC Power

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