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ADS数据无法通信,求高手指教

Other Parts Discussed in Thread: ADS1148

使用如附件原理图的电路对1148进行通信,发现SPI通信不了,通过示波器抓波行,发现示波器中MOSI可以抓到数据,MISO无数据应答。初步估计ADS1148电路有问题,但不知道哪里错了, 请高手指教。

原理图.pdf