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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  
5.2  
USB251x Pin Descriptions (Grouped by Function)  
Table 5.2 USB251x Pin Descriptions  
BUFFER  
TYPE  
SYMBOL  
DESCRIPTION  
UPSTREAM USB 2.0 INTERFACES  
USB Data  
USBDM_UP  
USBDP_UP  
IO-U  
These pins connect to the upstream USB bus data signals (host, port, or  
upstream hub).  
VBUS_DET  
I/O12  
Detect Upstream VBUS Power  
Detects state of Upstream VBUS power. The SMSC hub monitors  
VBUS_DET to determine when to assert the internal D+ pull-up resistor which  
signals a connect event.  
When designing a detachable hub, this pin should be connected to VBUS on  
the upstream port via a 2 to 1 voltage divider.  
For self-powered applications with a permanently attached host, this pin must  
be connected to 3.3 V (typically VDD33).  
DOWNSTREAM USB 2.0 INTERFACES  
USBDP_DN[x:1]/  
PRT_DIS_P[x:1]  
IO-U  
Hi-Speed USB Data  
These pins connect to the downstream USB peripheral devices attached to  
the hub’s port. To disable, pull up with a 10 K resistor to 3.3 V.  
USBDM_DN[x:1]/  
PRT_DIS_M[x:1]  
Downstream Port Disable Strap Option  
If this strap is enabled by package and configuration settings (see Table 8.1,  
"Hub Configuration Options"), then this pin will be sampled at RESET_N  
negation to determine if the port is disabled.  
To disable a port, pull up both PRT_DIS_M[x:1] and PRT_DIS_P[x:1] pins  
corresponding to the port numbers.  
PRTPWR[x:1] /  
O12  
USB Power Enable  
Enables power to USB peripheral devices downstream.  
When PRTPWR_POL pin is unavailable, the hub supports active high power  
controllers only.  
When PRTPWR_POL pin is available, the active signal level of the PRTPWR  
pins is determined by the power polarity strapping function of the  
PRTPWR_POL pin.  
BC_EN[x]  
IPD  
Battery Charging Strap Option  
*This feature is only available on USB251xB/Bi.  
If this strap is enabled by package and configuration settings, (see Table 8.1,  
"Hub Configuration Options"), this pin will be sampled at RESET_N negation  
to determine if ports [x:1] support the battery charging protocol (and thus the  
supporting external port power controllers) that would enable a device to draw  
the currents per the USB battery charging specification.  
BC_EN[x] = 1: Battery charging feature is supported for port x  
BC_EN[x] = 0: Battery charging feature is not supported for  
port x  
Revision 1.0 (3-11-09)  
22  
SMSC USB251x  
DATASHEET  
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