USB3813 datasheet(38/57 Pages) MICROCHIP

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USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

Datasheet

DS00001715A-page 38

 2014 Microchip Technology Inc.

8.1.2

Downstream Battery Charging

The device can be configured by an OEM to have the downstream ports to support battery charging.

The Hub's role in battery charging is to provide an acknowledge to a device's query as to if 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 as

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 to the device.This

indication, per the PRTCTLA output, is for all downstream ports.

Note: Battery charging is not available on downstream HSIC ports.

8.1.2.1

Downstream Battery Charging Modes

In the terminology of the USB Battery Charging Specification, if a port is configured to support battery

charging, the downstream port is a considered a CDP (Charging Downstream Port) if connected to a

USB host, or a DCP (Dedicated Charging Port) if not connected to a USB host. If the port is not

configured to support battery charging, the port is considered an SDP (Standard Downstream Port).

All charging ports have electrical characteristics different from standard non-charging ports.

‘11’

Charger detected.

Draw battery charger current from VBUS (1.0A+).

Note:

The actual current amount for the charger will be

system dependant.

Figure 8.1 Battery Charging External Power Supply

Table 8.2 CHRGDET[1:0] Configuration Definitions (continued)

CHRGDET[1:0]

DEFINITION

SOC

VBUS[n]

PRTPWRA

INT

SCL

SDA

Microchip

Hub

DC Power

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