智能驅(qū)動器可減少便攜式電子系統(tǒng)的能耗，讓PCB布局更規(guī)整

　　三贏：智能驅(qū)動器可減少PCB走線數(shù)量

　　為了讓配置數(shù)據(jù)從處理器流向智能驅(qū)動器，讓狀態(tài)、I/O或擊鍵數(shù)據(jù)流回處理器，ADP5520實現(xiàn)了I2C接口。這種設置可以減少外設和控制器之間的器件和走線的數(shù)量，從而簡化高密度便攜式電子設備中的PCB(印制電路板)設計。

　　當用鉸鏈或滑塊(hinge or slider mechanism)將顯示器、指示器和鍵盤與處理器分割開時，節(jié)能效果將更加顯著。在這種情況下，帶片上端口擴展器的智能LED驅(qū)動器可以減少與產(chǎn)品另一半連接的柔性電路的尺寸和成本(圖4)。

　　參考文獻：

　　[1]ADP5520:Backlight driver with I/O expander[R/OL]. http://www.analog.com/en/power-management/display-and-lighting/adp5520/products/product.html

　　[2]Marasco K.Running Low and Long[J/OL].Appliance Magazine,(2009-8). http://www.appliancemagazine.com/print.php?article=2260

　　[3] Christian A. Innovative Power Reduction Techniques Enable Handset Manufacturers to Provide Media Rich Devices [J/OL].LED Journal,(2009-9-1). http://www.ledjournal.com/images/PDFs/Online%20Issues/2009/LED_AugSept09.pdf#page=32

　　[4] Marasco K. Optimizing Power Systems For Portable Electronic Devices [R/OL].(2009-7-1). http://powerelectronics.com/images/PET070109.pdf

　　[5] Finn G. New Touch-Screen Controllers Offer Robust Sensing for Portable Displays[R/OL].(2010-2). http://www.analog.com/library/analogDialogue/archives/44-02/touch_screen.html