Using the Microchip Ultra Low-power Wake-up Module
This application note describes ways to reduce system current consumption with
the use of the Ultra Low-power Wake-up (ULPWU) module. Currently, the PIC16F684
has this module, but other low pin count parts will have it as well. The primary
use of this module is as an Ultra Low-power Wake-up (ULPWU) timer, but its functionality
can be expanded to function as a temperature sensor and/or a low-voltage detector.
The main and expanded functions of this module are explained in this document.
Many low-power applications require that the microprocessor wake-up from a Sleep
state on a periodic basis to check the status of some signal. It can then react
depending on a measurement and go back to Sleep until the next timed wake-up.
This is a widely used method for reducing overall system current
AN879, PIC16F684, ULPWU, Ultra Low-power Wake-up Module