Thanks all! No doubt it was my fault - I'm not trying to blame anyone else, I was more curious about what I did to my board. =) I had a couple other BBB's around so I was a bit cavalier with the whole thing - lesson learned, haha.
I really appreciate all the info, and will check all the suggested reading. Gerald - Assuming I just killed the AM335, would most of the other components on the board be okay, aside from possibly the Power Management chip? On Monday, June 6, 2016 at 10:12:43 AM UTC-7, Doyle S wrote: > > Hi, > > Yesterday I was trying to use some of the analog inputs on the BBB to read > my photodiode, and instead, I think I blew up the power supply on my board. > With power applied, I get no PWR led, so I'm pretty certain it's dead. > Short of replacing the power management chip, is there anything I can > do/replace to get the board working again? > > > Brief Background > > I hooked up the photodiode to an Arduino and was able to read 0 - 5V > easily, so I wanted to do the same on the BBB. > I read some of the materials re: AIN on the BBB, but apparently I missed > all the references to the max voltage of 1.8V! > I started by enabling the analog inputs on the BBB, and started with AIN0. > > With nothing attached, I was reading about 0 - so far, so good. > Then I figured I'd try to see what a full 5.0V read out, so I plugged in > the VDD 5V to AIN0, and all the LEDs went out instantly. > Now all LEDs stay off, even the PWR LED, when power is applied. > > No doubt, it was stupid, but I have a few additional takeaways - > 1. Very minor references in most BBB documentation/webpages discussing > Analog Inputs and max voltages. > Coming from working with Pi's and Arduino's, it was common to have analog > inputs range from 0 to 5V, so the 1.8V was unexpected. > > 2. Isn't there any protection at all from this kind of damage? Or was > the main problem that I used the VDD 5V and fed it into the AIN0 port? > Would I have killed it if I used the VDD ADC instead of the VDD 5v or > would using the VCC ADC possibly have protected it? > > 3. What is the "normal" way of using the BBB analog inputs with 5V > levels? Is it possible - or is there where I would use a level-shifter or > zener diode? > > Thanks for the any comments or additional info provided! > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/8b780479-5694-4cc5-8f60-17e9bdfd8ec5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
