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Took me too long to edit the previous post, I got locked!

I have downloaded the XLP LowPower App note from microchip and it is helpful. The 14K50 does not allows for deep sleep, but regular sleep...

That would be pretty good! I will have a look at how you managed to get that and will let you know. Thanks for the help!

Design is completed and can't be changed, beside there's no available I/O pin left.

IDLE power consumption is actually from the PIC and not from the peripherals.

The logger project is getting near completion! I am now into the autonomous mode power, and I was able to measure these figures while powering the device from a battery across a 10 ohm shunt.
...

I realized that I have a very strange problem when I write to my I2C EEPROM when the CPU is clocked at 32.768kHz, I get corrupted data if there's a long chain of "0" being sent.

I record my...

Yes but I commented all others as well. I just quoted the lines that caused the interrupt to stop working.

I want to disable the primary oscillator, because I have 2 operating modes:

1) USB...

Tried this step by step.

Commenting either or all of these:



OSCCON.1 = 0
OSCCON.0 = 1 'Use Timer1 oscillator as clock source
OSCCON.7 = 1 'Device enters in IDLE mode when sleep...

Hmm I don't really understand, I have this at the beginning of my code during initialization:


T1CON = %01101011 'Set Timer prescaler to /4 and enable Timer1 on external 32768Hz crystal
...

Back with more news, I made some great progress with the programming!

I am trying to implement the low power mode, however I find microchip datasheet to be a bit confusing. I switch from a 48Mhz...

It was time to pack things down, I must say that it is not easy to drill vias using a 0.3mm drillbit and sticking a tiny copper wire in it to make the connexion!
...

Yep will do!
I have setup the secondary oscillator with a 32k XTal. That way it will give me the time accuracy I need and I can clock the CPU using that source. I have yet to finish the main routine...

I could not get the CDC demo to run on my 18F4550 board, (though, 3 years ago it was running fine... but since then I changed PBP, MCS and PMLAB versions...). I preferred to carry on the actual...

Back on the PIC, dissecting the datasheet, this is what I have for the LF13K50

• Sleep mode: 24 nA
• Watchdog Timer: 450 nA
• Timer1 Oscillator: 790 nA @ 32 kHz

So using the watchdog timer to...

Cool! I missed this thread, I'll dissect it carefully, looks pretty much like all I want!

Trying to get the USB com. working.
Now there's a little details that I have seen stated but not previously understood:

The 18F13K50/14K50 requires the use of an external crystal of 12 or 48 Mhz...

Hi Bob! thanks for your observations!

Indeed, 1mA is waaaay too much!!!

I am giving the quiescent current because this is what is consumed most of the time. The component will be turned on when...

Dear everyone!

I am in the process of starting a new project around the 18F13K50, which have to mix ultra-low power and USB communication, a combination that seems to be difficult to mix.

I had...