USB2512AI datasheet(25/63 Pages) MICROCHIP

25 / 63 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251xB/xBi

Revision 2.2 (02-17-12)

DATASHEET

behaviors provide battery charging even when the hub is not enumerated and protect the hub from

sustained short circuit conditions. If the short circuit condition persists when the hub is plugged into a

host system the user is notified that a port has an over-current condition. Otherwise PRTPWR turned

on by the host system and the ports operate normally.

4.2

Battery Charging Configuration

The battery charging option can be configured in one of two ways:

When the hub is brought up in the default configuration with strapping options enabled, with the

PRTPWR[x:1]/BC_EN[x:1] pins configured. See the following sections for details:

— Section 3.3: Pin Descriptions (Grouped by Function) on page 19

— Section 3.3.1.2: Internal Pull-Down (IPD) on page 22

When the hub is initialized for configuration over I2C EEPROM or SMBus. Either of these interfaces

can be used to configure the battery charging option.

4.2.1

Battery Charging enabled via I2C EEPROM or SMBus

asserted. Bit 1 represents port 1, bit 2 represents port 2, etc. Each port with battery charging enabled

asserts the corresponding PRTPWR[x:1] pin.

USB2512AI Datenblatt(PDF) 25 Page - Microchip Technology