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USB3503 数据表(PDF) 49 Page - Microchip Technology |
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USB3503 数据表(HTML) 49 Page - Microchip Technology |
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49 / 73 page  2011-2015 Microchip Technology Inc. DS00001584B-page 49 USB3503 Since the enumeration process for a hub sets the PORT_POWER feature for all downstream ports, this information can be used to switch control over the PRTPWR setting between the battery charge logic and the hub logic. • When the Hub PORT_POWER feature is ‘1’, the hub logic controls the PRTPWR setting. • When the Hub PORT_POWER feature is ‘0’, the battery charging logic controls the PRTPWR setting. No matter which controller is controlling the PRTPWR setting, an overcurrent event will always negate PRTPWR setting. 8.1.3 BATTERY CHARGING CONFIGURATION Configuration of ports to support battery charging is done through serial port configuration load. Register D0: Downstream Battery Charging Enable - BC_EN is allocated for Battery Charging support. The register, starting from Bit 1, enables Battery charging for each down stream port when asserted. Bit 1 represents port 1 and so on. Each port with battery charging enabled asserts the corresponding PRTPWR register bit. |
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