VBAT Emulation Using PIC24F eXtreme Low-Power (XLP) Microcontrollers
This Appnote describes how to switch between the main power supply and battery backup (VBAT) in devices that do not support on-chip VBAT capability. The methods to achieve VBAT emulation using some of the Core-Independent Peripherals (CIPs) available on the PIC24F eXtreme Low-Power (XLP) microcontrollers and a few external passive components are described in this document. The proposed VBAT Emulation modes offer a comparable low-power performance, while adding minimal cost, and can be implemented with any of the PIC24F XLP microcontrollers.
VBAT, VBAT Emulation, PIC24F, Low Power, XLP, eXtreme Low Power, Microcontroller, CIP, Core Independent Peripherals, battery