USB5734 datasheet(36/61 Pages) MICROCHIP

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USB5734

DS00001854D-page 36

 2015-2016 Microchip Technology Inc.

8.0

FUNCTIONAL DESCRIPTIONS

This section details various USB5734 functions, including:

• Downstream Battery Charging

• FlexConnect

• Resets

• Link Power Management (LPM)

• Remote Wakeup Indicator

• Port Control Interface

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_CTL[4:1] 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.

For additional information, refer to the Microchip USB5734 Battery Charging application note on the Microchip.com

USB5734 product page at www.microchip.com/USB5734.

8.2

FlexConnect

This feature allows the upstream port to be swapped with downstream physical port 1. Only downstream port 1 can be

swapped physically. Using port remapping, any logical port (number assignment) can be swapped with the upstream

port (non-physical).

FlexConnect is enabled/disabled via the FLEXCONNECT control bit in the Connect Configuration register (address

0x318E). The FLEXCONNECT configuration bit switches the port. This bit can be controlled via the I2C interface or via

the FLEXCMD pin (PROG_FUNC6 in configurations 1 or 2). Toggling of FLEXCMD will cause an interrupt to the device

firmware. The firmware will then change the port direction based on the input value. Refer to Section 3.4.5, "Device

Mode / PROG_FUNC[7:1] Configuration (CFG_STRAP)" for additional information.

For additional information, refer to the Microchip USB5734 FlexConnect application note on the Microchip.com

USB5734 product page.

FIGURE 8-1:

BATTERY CHARGING EXTERNAL POWER SUPPLY

SOC

VBUS[n]

PRT_CTL[n]

INT

SCL

SDA

Microchip

Hub

DC Power

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