Powering Concept

[brue]

Hi

Im want to design a device. It contains a PIC24F32KA304 micro and a LCD EA DOGM163L-A.
The LCD drives about 250uA. If the device is in use, the CTMU (Capacitive Sensoring) of all 16 Channels is active. If the device is OFF, it is in Deep Sleep Mode.
If the device is OFF and in Deep Sleep mode, so i want to wake it up with a pushbutton on a interrupt input.
I want to Power the whole thing with one or two CR2032 Cells.
Its verry difficult for me to find out how much current the micro finally will draw.
The LCD works with 3.3V, the micro with 1.8...3.6V.

Should i use two CR2032 cells in series with a linear voltage regulator? The whole thing should draw the smallest current as possible.

Any ideas?

Thanks

[Simon]

make sure you use a low quiescent current reg as standard ones can use upwards of 2mA! on standby