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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  
Figure 6.1 shows a simple example of how this LED circuit will be implemented. The circuit should be  
replicated for each of the x LED pins on the SMSC hub. In this circuit, when the LED pin is driven to  
a logic low state, the Green LED will light up. When the LED pin is driven to a Logic High state the  
Red LED will light up. When a 1 KHz square wave is driven out on the LED pin, the Green and Red  
LED's will both alternately light up giving the effect of the color Orange. When nothing is driven out on  
the LED pin (i.e. the pin floats to a "tri-state" condition), neither the Green nor Red LED will light up,  
this is the "Off" state.  
The assignment is as follows:  
LED_A_N[x:1] = LED D[x:1] (Downstream Port [x:1])  
The usage is as follows:  
LED_A_N[x] Driven to Logic Low = LS device attached (Green LED)  
LED_A_N[x] Driven to Logic High = FS device attached (Red LED)  
LED_A_N[x] Pulsed @ 1 KHz = HS device attached (Orange color by pulsing Red & Green).  
LED_A_N[x] is tri-state= No devices are attached, or the hub is in suspend, LED's are off.  
Revision 1.0 (3-11-09)  
30  
SMSC USB251x  
DATASHEET  
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