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Other Parts Discussed in Thread: MSP430G2231
UCB0SDA和UCB0SCL必须要接10K上拉电阻吗？
你好，由于I2C接口采用Open Drain机制，器件本身只能输出低电平，无法主动输出高电平，只能通过外部上拉电阻RP将信号线拉至高电平。
因此I2C总线上的上拉电阻是必须的！
MSP430G2231 internal pull-ups内部上拉电阻大约在 35K左右 （具体的内部上拉电阻详见具体芯片手册）如果低速的情况下可以用内部，但是在总线上挂多个设备的时候这种方式不推荐使用，还是要外接上拉电阻。
