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ADS1298 设置内部参考时不工作(VREFP=VREFN)

Other Parts Discussed in Thread: ADS1298

芯片接法参考的参考设计,如图

寄存器写入参数如下,

SPI读写控制也正常,但VREFP管脚电压和VREFN管脚电压没区别,大家能帮忙看下可能是啥问题吗?