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RF430FRL152H: VDD2X电压问题

Part Number: RF430FRL152H

你好!

我使用仿真器为rf430frl152h芯片供电,通过一个稳压器给VDDB引脚输入1.5V的电压,并用跳线帽连接VDDB和VDDSW引脚。

但是VDD2X引脚的电压只有1.3V,不应该是2.7V吗?请问可能的原因有哪些?