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Documents MAX7317采用单片可以正常读写,但是不清楚采用3片菊链方式下如何对器件进行读写操作?
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    • MAX7317采用单片可以正常读写,但是不清楚采用3片菊链方式下如何对器件进行读写操作?
    • The MAX7317 SPI communication waveform looks correct but the IO output is always logic high. Why is this?
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MAX7317采用单片可以正常读写,但是不清楚采用3片菊链方式下如何对器件进行读写操作?

如果您能够对一个器件操作成功的话,在菊链模式下,将3个器件当作一个器件来操作就可以了,对于一个器件的操作是写16位数据,然后拉高CS,对于3个菊链的操作就是拉低CS,发送48位数据然后拉高CS就可以了。最先发送的16位对应于离控制器最远的器件,最后写入的对应于离控制最近的器件。对于读操作也是一样的,先发送读命令(D15=1)和地址,后面跟随8位无效数据,3片菊链,就要按这种方式发送3*16位这样的数据,然后拉高CS,接下来发送读或者写命令,同样发送3*16位,这样就可以在DOUT得到3*16位结果,每个16位结果中的第二个字节是读取的结果,最先得到的结果是离控制器最远的器件读取结果。

Tags: MAX7317 video KA-06745
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