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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 6 LED Usage Description  
6.1  
LED Functionality  
USB2513 and USB2514 (48-pin QFN only) and USB2517/17i SMSC hubs support two different  
(mutually exclusive) LED modes. The ‘x’ represents the number of downstream ports. The USB mode  
provides up to 14 LED’s that conform to the USB 2.0 specification functional requirements for Green  
and Amber LED’s. The LED mode “speed indicator” provides the downstream device connection  
speed.  
6.1.1  
USB Mode 14-Wire  
The LED_A_N[x:1] pins are used to provide Green LED support as defined in the USB 2.0  
specification. The LED_B_N[x:1] pins are used to provide Amber LED support as defined in the USB  
2.0 specification. The USB specification defines the LED’s as port status indicators for the downstream  
ports. Please note that no indication of port speed is possible in this mode. The pins are utilized as  
follows:  
LED_A_N[x:1] = Port [x:1] green LED  
LED_B_N[x:1] = Port [x:1] amber LED  
6.1.2  
LED Mode Speed Indication  
The LED_A[x:1]_N pins are used to provide connection status as well as port speed by using dual  
color LED's. This scheme requires that the LED's be in the same package, and that a third color is  
produced so that the user perceives both LED's as being driven "simultaneously".  
The LED_A[x:1] pins used in this mode are connected to x number of dual color LED’s (each LED pair  
in a single package). These pins indicate the USB speed of each attached downstream device.  
Each dual color LED provides two separate colors (commonly Green and Red). If each of these  
separate colors are pulsed on and off at a rapid rate, a user will see a third color (in this example,  
Orange). Using this method, 4 different "color" states are possible (Green, Red, Orange, and Off).  
3.3 V  
General  
Purpose  
Diode  
Connection to  
other Dual Color  
Diodes  
D1A (Green LED)  
Hub LED pin  
Current Limiting  
Resistor  
D1B (Red LED)  
Figure 6.1 Dual Color LED Implementation Example  
SMSC USB251x  
29  
Revision 1.0 (3-11-09)  
DATASHEET