my question(s) are as follows:
1.) How much current can the CR2032 give? I have looked and not only do I see different numbers.. I usually only see it for mAh... not mA? Im thinking I need about
1mA? 2mA? Certainly very little indeed.
I understand that these CR2032's are mostly for high energy, low power projects...
Strictly micro-power applications only, like calculators (a few tens of uA)
and I guess Im needing the opposite... or at least just more current.
For an SDcard you need a regulated 3.3V and perhaps upto 150mA - SDcards can be power hungry, different cards take
different currents, and more when writing.
2.) The space/area I have to work with.. really is only suited for a 'coin cell' type of battery... it can be a little 'bigger' (23mm diameter I think I have room for?.. maybe a bit more if needed)... Is there anything out there that can work for my needs?
Do you need the capacity of an SDcard? An EEPROM might be less power hungry. You will really struggle to find anything for that
size, but the best power density is LiPo, the best voltage match might be LiFePO4. Well having said that 23mm diam, but how long?
3.) Is there a value/sepc on these datasheets Im supposed to be looking for/at to see if the battery can DELIVER the current I need?
When you can find a datasheet for a battery it will have discharge curves - these are perhaps the best info. The datasheet only
covers one type of cell from one manufacturer.
Secondary question... about my PSU (benchtop Mastech HY1803DL)
I set the voltage to +3v
I set the current to be 'about' .10-.11 Amps (100-110mA)
when I connect it to my project..and power it on..
I see the current LCD screen 'jump'.. to about .06A....... when I press the button and trigger an audio clip to play.. I see the current LCD screen on my PSU jump to about .08A
Im curious as to what my current LCD screen is 'reflecting' (telling me).. is this the current 'draw' of my project? (kinda cool/nice if it is...nice way to 'tell')
Yes, you're powering up the SDcard at that point perhaps, and perhaps an audio amp, so the current will rise. 80mA is actually quite
modest in fact