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XTR115无输出电流、Iret接的GND,不明白怎么接

Other Parts Discussed in Thread: XTR115

输入就是单片机DAC输出的电压、3V。Iret接到了AGND,输出用电流表测(加电阻),无电流输出。

电源是板子上的24V,24V下面有DCDC和LDO 给整个板子供电。

看了一些回答说IRET不能同地,但单片机输出电压怎么接 只接3.3V?IRET悬空?