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ads8515的疑问

Other Parts Discussed in Thread: ADS8515

我用verilog 编写了ads8515 的驱动程序,然后用jtag抓取了AD采集的信号,奇怪的是BUSY为第电平时数据一直为7FFF,当转换完成时电平时FFFF,这是为什么?

技术手册中说FFFF代表:One LSB below midscale

7FFFF代表Full scale (10 V – 1 LSB)
这是为什么?真正的数据在哪?

急求!!!谢谢啦