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SMBUS需不需要接上拉电阻

Other Parts Discussed in Thread: BQ40Z50-R1

我采用的MSP430软件模拟SMBUS和电量计BQ40Z50-R1通信,调试发现不接上拉电阻不能正常通信。但是我在别的资料上面看到,有的说不需要接上拉电阻。

请工程师帮我解答下。

thankyou