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CC2640R2F: VDDR输出为0.9v并且逐渐降低,ccs烧录程序出现错误-181,识别不到电路板

Part Number: CC2640R2F

VDDR输出为0.9v并且逐渐降低,应该为1.8v的输出,vcc输入3.3v正确。