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USB2512B-AEZG 参数 Datasheet PDF下载

USB2512B-AEZG图片预览
型号: USB2512B-AEZG
PDF下载: 下载PDF文件 查看货源
内容描述: USB 2.0高速集线器控制器 [USB 2.0 Hi-Speed Hub Controller]
分类和应用: 外围集成电路控制器PC时钟
文件页数/大小: 72 页 / 1689 K
品牌: SMSC [ SMSC CORPORATION ]
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USB 2.0 Hi-Speed Hub Controller  
Datasheet  
Chapter 7 Battery Charging Support  
7.1  
General Description  
The battery charging feature is only available in USB251xB (which represents USB2512B/3B/4B and  
USB2512Bi/3Bi/4Bi hub family products). Any one or combination of downstream ports on the  
USB251xB hub can be configured to support battery charging.  
The SMSC hub provides support for battery charging devices on a per port basis in compliance with  
the USB Battery Charging specification, version 1.1. The hub can be configured to individually enable  
each downstream port for battery charging support either via pin strapping as illustrated in Figure 7.1  
or by setting the corresponding configuration bits via EEPROM or SMBus.  
3.3 V  
5 V  
USB Port Power  
Controller  
RSTRAP  
IN  
PRTPWR[x]  
OCS_N[x]  
VBUS  
USB251xB/xBi  
EN  
FLAG  
Note: RSTRAP enables battery charging.  
Figure 7.1 Battery Charging via External Power Supply  
7.2  
USB Battery Charging  
A downstream port enabled for battery charging turns on port power as soon as the configuration  
process has completed. The hub does not need to be enumerated nor does VBUS_DET need to be  
asserted for the port power to be enabled. These conditions allow battery charging in S3, S4 and S5  
system power states as well as in the fully operational state. The USB Battery Charging specification  
does not interfere with standard USB operation, which allows a device to perform battery charging at  
any time.  
A port that supports battery charging must be able to support 1.5 amps of current on VBUS. Standard  
USB port power controllers typically only allow for 0.8 amps of current before detecting an over-current  
condition. Therefore, the 5 volt power supply, port power controller or over-current protection devices  
must be chosen to handle the larger current demand compared to standard USB hub designs.  
7.2.1  
Special Behavior of PRTPWR Pins  
The SMSC hub enables VBUS by asserting the port power (PRTPWR) pin as soon as the hardware  
configuration process has completed. If the port detects an over-current condition, PRTPWR will be  
turned off to protect the circuitry from overloading. If an over-current condition is detected when the  
hub is not enumerated, PRTPWR can only be turned on from the host or if RESET_N is toggled. These  
SMSC USB251x  
31  
Revision 1.0 (3-11-09)  
DATASHEET  
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