Search found 33 matches

Just in case anyone wondered what the outcome was, .. simple .. as I couldnt get it to read above 30,000 just multiply the output by 2 and add or subtract 1 periodically ..

Cheating yes but noone w ...

Well it sounds like I need to get reading again.

thanks

Postscript:
I believe that the AD7705 internally disconnects the input when it does
a zero calibration so assuming this is correct it shouldnt matter whats going on with the input pins so long as th ...

Well I see your point if it were working in bipolar mode but alas it isnt
working in offset binary format so I think the issue with the mode is that the mode command definitions must have an error - ...

Apology for posting a similar thread.. running to a deadline I'm afraid and didnt think to check.

I changed the mode between BIPOLAR and UNIPOLAR but didnt get
anywhere incidentally .. but it app ...

I'm back to the AD7705 which has been the only glitch with my design.
The following code reads back 22547 at 2.45V with a 2.5V reference in
unipolar mode and somewhere near 23100 at 2.49V. I seem to ...

Yes but I was wondering whether there is some buffering setting or combination that would improve things. As per usual the gremlins have gone away and its working (mostly) correctly now.

It gets slower as the input voltage increases ... very annoying.
It also locks up and the frequency with which it locks up depends
on the level of the input voltage.

At present my code forces a r ...

I've been testing a design with an AD7705 ADC using the standard bit banged CCS driver code.

I noticed that as the DC voltage to the ADC goes up the conversion speed
drops dramatically by a factor ...

I'd like to modify the code for getc() or getch() or getchar().
Is this defined somewhere, I cant find it ?

Thanks .. that is an excellent piece of information !

I'm having trouble getting the WDT to turn off. The following code
runs but the line setup_wdt(WDT_OFF) doesnt work - in other words the WDT still runs. I would also like to dynamically change the W ...

I'm just wrapping up a job. The AD7705 Zeroes itself but the offset required for zero volts is 0.45V and after this the maximum output I can get in UNIPOLAR mode is 31807 (0x7c3f).

I'd like it to z ...

Thanks again, I stuck the code in the program rather than as a separate
file as I read there were errors in the driver and I wanted to make sure it
wasnt loading a file from somewhere I didnt expect ...

I've been testing an AD7705 and it works but value read at zero
volts wont display as zero but has an offset of around 26922.

I've tried the UNIPOLAR and BIPOLAR configurations with no
success. ...