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[I2C]pca9555(i2c-gpio扩展)应用层测试代码PCA9555芯片资料,PCA9555用于IO口扩展,3.3V,可接5Vhttps://blog.csdn.net/anxuan3201/article/details/101121044?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522162986216216780269849531%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=162986216216780269849531&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-101121044.pc_search_similar&utm_term=pca9555&spm=1018.2226.3001.4187