PIC10F206 - What is the LOWEST Power @ Rest or Sleep

[rixtalbert]

I have been experimenting with my 10F206's for months now, and I am measuring the differences in Sleep mode using Pic Basic Pro.
The PBP manual states that the END statement is just a cycle of SLEEP commands. Since SLEEP and NAP commands use the WatchDog timer, WDT must be turned on. for any of the three commands to work properly or at all.
When the END command is reached in the program, the PIC does go down to about 1.9 to 2,1 u Amps. That doesn't seem to bad.
I am using a NEW Fluke 189 Data logger meter to measure the current in sleep. When I Select the MAX/MIN button on the meter, ( FAST RECORD), the PIC records a pulse of current to about 87.2 u Amps about every three seconds or so.
THE QUESTION---------
Is there any way to completely turn off the WDT from waking up and drawing that current to stay at the 2.0 uAmp range or less?
I was wanting to use a bunch of NAP statements in my program also just to save some power while doing stuff and then Completely turn off all power till a new Power UP. My design does not need to wake up until a new power supply is applied.

Thanks All


Thanks

RIX

[Jerson]

A simple statement like this will do exactly what you want

This is inline assember

turn off all interrupts here
@ sleep
goto main ' on wake up


Jerson

[rixtalbert]

Thanks Jerson,

I had tried that, and I still get a blip of 87.5 uAmps about every three seconds. I guess I need a more expensive meter to see exactly what the transistion times are between 1.6 uAMp and the high pulse current of 85 uAmps. I thought I had read somewhere that the WDT will keep waking up to check things out and go back to sleep. I just cannot find out if you actually can KILL the WDT after a END of program is hit.
Also I thought that the @SLEEP ,,,, ASM command still had to have the Watchdog timer running to function.

I'll keep digging.

Regards
Rix

[sougata]

Hi,

If you like your PIC to go to a dead sleep then the WDT needs to be turned off. Use your config settings to turn it off and also use:

DEFINE NO CLRWDT 1

This prevent PBP from inserting code to clear the WDT periodically in other words saves code space.

[rixtalbert]

Sougata,
I think that is and excellent command if it would only work after all of my other naps through my program.

In the battery world as you know, I am trying to squeese every bit of power from the battery as I can.
The naps instead of PBP pause commands give me that better edge.
But when it come to the end of the program, (runs for about a minute and a half to three minutes) I want to put the program on a deep sleep until the power is cycled. That is my problem.
I cannot get to deep sleep (lowest power possible) without enabling the WDT.

I had thought that there may be a POR id Power on Reset that would take out the WDT and let the chip go frozen with 2 uAmp or lower if the power supply was still connected without the WDT waking up and looking for who needed help and going back to the 2uAmp state.

I did complete a logging session with my Fluke 189 and I did see currents as high as 127 uAmp while it was suppose to be very rested. I have sent an email to FLUKE to ask why I could not log the FAST min/MAX on the software as I do on the 189 Display.

For my Application, I wish PBP could find a way to completely KILL the WDT at the end with a NEW "KILL" statement. I don't know if that would make other people happy, but it would seem to come in handy for BATTERY apps.
I bet Jeff or Bruce could come up with a ASM command that could "KILL" future WDT timer routines. (PBP Kill command)

Thanks to All
Regards
Rix

[sougata]

I cannot get to deep sleep (lowest power possible) without enabling the WDT.

Hi,

Please note that you need not use the PBP sleep command. With your watch dog turned off from the configuration bits you can put the micro to sleep via its direct asm instruction "SLEEP". Jerson showed you a way to do that in ASM. Only keep in mind that a comparator interrupt or pin change interupt can wake it up again. Already mentioned by jerson. Turn them off.