模拟开关扩展I²C接口

摘要：设计理念，概述了如何使用的I² C控制的模拟开关连接到一个I²C总线上的设备数量增加两倍。
Maxim > App Notes > Analog Switches and Multiplexers Interface Circuits
Keywords: I2C, analog switch, clock data SDA SCL port expansion, analogue switch Apr 12, 2002

APPLICATION NOTE 955
Analog Switch Expands IC Interface


Abstract:Design idea outlining how to use an IC-controlled analog switch to triple the number of devices connected to an IC
bus.

Perhaps the most effective way to gain board space and increase component density is to minimize wiring on the board. A widely
used architecture that allows such miniaturization is the IC bus. Comprising only a bidirectional data line, SDA, and a clock line,
SCL, this bus requires no chip selects or other additional connections.

Microcontrollers from Philips, Microchip, a