，用来控制带i2c的风扇板及读写e2prom都没问题，但是用来进行两个AVR单片机之间的通信时，有时会出现数据发送和接收错误（单片机AT1281的TWI引脚连接到i2c缓冲器PCA9513上，通信是在ATCA六槽机箱中进行，但是只用了两个槽位，其他的悬空-That is used to control with the i2c fan board and literacy e2prom all right, but used for two AVR of communication between the microcontroller, can appear sometimes sending and receiving data error (SCM AT1281 of TWI pin connected to the i2c buffer PCA9513, communication is in ATCA six slot chassis, but only two slots, other suspended