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ADS8689: ADS8689可以读出模拟量,无法写入寄存器

Part Number: ADS8689

ADS8689可以正常读出模拟量(芯片默认配置)。
我想把寄存器配置成单极性1.25倍的ref,但是寄存器无法写入。

这是什么原因?