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Basically, I just want my program to be able to save preferences changes that users make when using the program on the chip. I figured that using IAP to save a few integers would make it possible to recall those integers if there was a power cycle.
I am programming in C on a Keil uVision 3...
That's great, thanks for that. What do you make of the 4.5mA flow when the the two grounds are connected? Does that make sense and how would I have calculated that without the use of Multisim?
Cheers!
Sorry, I meant to say VSS
I am using a multi-tap transformer as the main power source.
- 15VAC from this is rectified/regulated down to 12VDC. This goes into the dev-board that includes the CMOS. This 12VDC is rectified/regulated on the dev-board down to 5VDC to power the PIC etc.
- The 12VDC...
Thanks Brian. Could you please explain in more detail what connecting the transistor ground to the CMOS ground will exactly do? I am interested!
EDIT: sorry, i meant connecting the negative supply to the CMOS ground...
Added after 4 hours 19 minutes:
I simulated a similar circuit...
ahh - yes there is a bridge rectifier - the circuit will accept AC!
OK - so this is the source of my 0.7V drop? If so, what do I do about it!!!
Thanks for all the help people, i really appreciate it
It doesn't unfortunately. If it is the case that it is a digital output set to low, what do I do about it?
Added after 22 minutes:
ahh... So I have a case of analog ground (AGND) vs digital ground (DGND)! Which one do I use?
I am using a multi-tap transformer as a power supply. I have rectified and regulated oneof the taps to generate a 12vdc steady power supply. I did this because my dev kit takes 9-12vdc that it then rectifies/ regulates down to 5v to power a programmable IC. This IC has a bunch of input/output...
Thanks for your reply. If I connect the two grounds together then won't there be a constant flow of current from the CMOS (the CMOS "0V" is 0.7V higher than the power supply 0V)
Hi, I have a development board powered by 12VDC that has a CMOS 5V output pin that I can control.
I want to use the 5V output to switch on a 12V relay. So I am using a transistor to avoid drawing too much current from the CMOS to switch on the relay. My problem is that the CMOS 0V is 0.7V...
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