USB2512 Просмотр технического описания (PDF) - Microchip Technology

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USB2512

USB 2.0 Hi-Speed Hub Controller

Microchip Technology 

USB251xB/xBi

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 PRT-

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

- Section 3.3, "Pin Descriptions (Grouped by Function)," on page 12

- Section 3.3.1.2, "Internal Pull-Down (IPD)," on page 15

• 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

Register memory map location 0xD0 is allocated for battery charging support. The Battery Charging register at location

0xD0 starting from bit 1 enables battery charging for each downstream port when 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.

DS00001692C-page 18

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