Could always use a 555 as a charge pump for your micro power mcu too. Indeed, a small $0.23 mcu may have its own internal RC oscillator, or even a MEMS based r

Could always use a 555 as a charge pump for your micro power mcu too. Indeed, a small $0.23 mcu may have its own internal RC oscillator, or even a MEMS based resonator on a PLL. =3