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tca6424a 是I2C形式的IO扩展IC,它只有一个地址脚。我需要用5片,于是想把地址脚当做片选来用。tca6424a地址脚的状态是在芯片上电时决定的?还是说可以随时改变并被器件自身检测到?手册里一说,只能接两颗芯片;又说只要在一个起止通信周期内保持通信地址线状态不改变就OK,