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CC2640R2F: 针对YFV,内部DCDC和内部LDO是怎么设置的

Part Number: CC2640R2F

请教一下,规格书上说如果不使用内部DCDC,VDDR接的就是内部LDO。那怎么判断芯片是使用内部DCDC还是内部LDO呢,是芯片自动感应,还是外面人为设置 ?

谢谢!