Re: Can you help me with Power down modes plss, I realy need
i use a couple of 'wake' int sources. One is an RTC which has a vast timing capacity, and another is one of Maxims thermostat devices.
Regardless, if your interrupting to exit a powerdown mode, consider that execution doesn't actually begin until the int line is released. This differs from the idle mode.
The difference in consumption between idle and power down is substantial for my battery operated devices. I painstakingly reasearch each function looking for low power devices. I will use the LP4052 whenever I can, but also use the 5131 for USB and extended waking capacity via the keyboard interface port. This latter device's program revolves around the need to put it to sleep as soon as possible.
Consider that some of the RTCs have an idle current under 1uA, provide a time stamp, operate on I2C, may contain some memory buffer, and in a mini surface mount package takes up little space.