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LMP91000: LMP91000WE pin internal zero problem

Part Number: LMP91000


As shown above, VREF has an input voltage range of 1.5 v-vdd. I set the chip to three-electrode mode, set the internal zero to 50% , and apply a Triangular  wave of 1.5V-4V to the VREF pin. According to the instructions, the WE pin should have a ground voltage of 0.75-2V, but I use the oscilloscope to see the waveform as follows, what is the reason?