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MSP430F5529 BSL USB无法识别,不稳定

Other Parts Discussed in Thread: MSP430F5529

hi all,

我用MSP430F5529  BSL 存在 USB无法识别 ,有时候能识别,大部分无法识别有效设备,不稳定,这种概率发送的概率大概再3% ,(100片有2-3片).

我排除了接触不良的情况,这种问题如何定位? 会是阻抗匹配的问题吗?  紧急请求帮助!