how to put PIC16F639 into sleep mode

[yan612]

Halo,

i tried to put PIC16F639 into sleep mode, the currenct consumption should be 'zero" ampere but my lowest current consumption is 0.02A.
i use the command sleep() to put PIC16F639 in sleep mode, is it any other thing else i didn't set to put the chip into sleep mode?
please advice..
thanks..

[Ttelmah]

Do a search on the forum. There have been many threads about this in the past.
General things:
1) Remember that pins driving things draw current. You need to switch all pins to the state where things are turned off, before entering sleep. Also, don't leave inputs 'floating'. These will result in extra power being drawn.
2) What voltage regulator are you using for your supply?. Simple regulators like the 7805, can easily account for 10mA themselves...
3) Turn off unwanted peripherals. Things like the watchdog timer. If not being used.

Best Wishes

[yan612]

thanks for the advice..
i've go through all about sleep that i can find in the forum and tryout some of the method but it still cant work..
actually, i am using another chip (AS3931 from austria microsystem) to replace the AFE part in PIC16F639. So, i cannot use the SPI part of the AFE.
without using the function in the AFE, can i still use the wake up from sleep function??i just want a confirmation from any of you so that i don't need to crack my head doing what that is impossible, thanks

[Ttelmah]

If you are not using the AFE, then switch to the 636...
Yes, you can wake from sleep without using the internal AFE. Just connect the 'wake' output, to the RA2 pin on the PIC, and enable this interrupt.

Best Wishes

[Humberto]

[Ttelmah]

Yes, very essential.

Best Wishes

[yan612]

thanks for the advice..

but, my RA2 pin is occupied for LED as i need it as indicator..
if i remain using RA0 as my wake pin, is it possible?
thanks

[Humberto]