看一款芯片INA260，里面提到
The device has two address pins, A0 and A1 that can be connected to GND, VS, SCL or SDA to set the desired
address. 表 2 lists the pin connections for each of the 16 possible addresses. The device samples the state of
pins A0 and A1 on every bus communication in order to establish the pin states before any activity on the
interface occurs.
没想明白，芯片用不断变化的SDA,SCL线如何确定片选地址的。。。
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