在本应用笔记详细讨论了飞利浦半导体家庭多路复用器及开关，设备的操作，软件编程，上拉电阻大小/总线终端和典型应用。 INTEGRATED CIRCUITS APPLICATION NOTE AN262_2 PCA954X FAMILY OF IC / SMBus MULTIPLEXERS and SWITCHES PCA9540B, PCA9541, PCA9542A, PCA9543A, PCA9544A, PCA9545A, PCA9546A, PCA9547, PCA9548A, PCA9549 Abstract - Philips Semiconductors family of Multiplexers and Switches are detailed in this application note that discusses device operation, software programming, pull up resistor sizing/bus termination and typical applications. Paul Boogaards - Field Application Engineer Jean-Marc Irazabal - PCA Technical Marketing Manager Steve Blozis - PCA International Product Manager Specialty Logic Product Line Logic Product Group Philips Semiconductors October 27, 2004 ……