What would happen if i connect DEC2 on the nRF51822 to 3v instead of the 1.8v it was designed to?

[hxh]

maybe one of you has done this accidentally or to test things out. also what does DEC2 actually do?

[Stian Røed Hafskjold]

DEC2 is for decoupling the 1.7V LDO regulator in normal mode. In low voltage mode you can bypass the regulator and apply 1.75 - 1.95 V. 3V will probably break the chip.