Quote Originally Posted by jason View Post
I am trying to implement a battery backup and a low power mode when theres no power. I just need to detect a door opening and record the time and date to a serial eeprom.
When I looked up the pic I'm useing I was happy, only 500 Na in standby but when I looked up the crystal oscillator I'm using it said 20ma
I have always used these type of oscillators due to solid performance and not needed the hard to find caps. But this project is all SMD and needs to be low power while the machines turned off all night. Sooooo
this Pic is the PIC16F59-I/PT running at 20mhz (but 4mhz would work fine).
How many mili amps or N amps would a normal crystal with caps use ? and would I define LP crystal ?
I got different numbers than what you got...(according to DS41213D)...
@ 20Mhz @ 5v, using a crystal, running (not including any external pieces/parts, extended temp version) - 7mA max
Standby/Sleeping - 2v w/ WDT enabled - 15uA max.

Any reason why you're using the 'F59? There are much better chips out there with a lot more options and probably cost the same, if not cheaper. The 'F59 doesn't have much in the way of options.