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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/970530/pcf8574-address-floating
大家好、
如果 A0、A1、A2全部悬空、是否会有问题？
I2C 地址是否有任何影响？
谢谢、此致、
Jamie
三个地址引脚为普通 CMOS 输入、不得悬空。 如果它们悬空、则会得到击穿电流、地址是随机的、I²C μ A 访问不太可能工作。
