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AFE4400的 SPI读取问题

Other Parts Discussed in Thread: AFE4400

最近在调试AFE4400模拟前端,总是读取不到返回的数据,用示波器探测MISO引脚一直为低电平。我想问一下AFE4400对SPI有什么要求,CLK频率要多少?

2MHZ可以么?谢谢