about current consumption at 1.8V

[Qinghua]

Hi, Schematic and Code As shown above, VCC 3V (DEC2 and VCC open) current is only 3.8uA, but VCC 1.8V (DEC2 and VCC short circuit) current exceeds 1mA, what am I mistaken? Would like to hear any suggestions about Low voltage mode, thank you!

[Sigurd]

Try __WFE(); __SEV(); __WFE(); , and then do a power-reset.

If that does not help, then it could be an issue with debug mode. See this post. Regarding your layout:

We recommend to add a small resistor on the SWDCLK line to make it more robust [See reference circuitry in nRF51822 Product specification v3.3. The resistor should be as small as possible, yet still make it possible to program the chip. We have recommended 1kohm.