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关于ADS1271芯片检测与驱动程序问题

TI工程师  你好!

   我在调试这芯片时不知道什么原因,一直调试不出来,然后我 简单的做了测试  电路如图,使其工作在SPI高精度模式,按芯片手册,在10PIN 应该能检测到有低跳变,可用示波器观察一直为高,百思不得其解,求解释。