Datasheet

USB251xB/xBi
DS00001692C-page 18  2010 - 2015 Microchip Technology Inc.
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 I
2
C EEPROM or SMBus. Either of these interfaces can be used
to configure the battery charging option.
4.2.1 BATTERY CHARGING ENABLED VIA I
2
C 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.