[Resolved] O2+ shutdown (power distribution??) correlated with use of GPS Expansion

William Scott

@ccs-hello Thanks for the tip! The U-Box NEO-6 is indeed the device in use.

Following is an excerpt from a power budget section of a test report for the system.

https://www.dropbox.com/s/dc6vo6567eytxjn/Screenshot 2018-02-15 11.33.14.png?dl=0

The 3.0V operation with a 111mA (minimum) load would put us in the upwards of 400mW dissipation range. As you can see from the measurements the unit is actually responsible for dissipating over 700mW. Ouch!!!

I'll rig up a couple of test cases (or one more complex). Will take a look at whether or not the O2+ reset line gets asserted as a function of the current load.

thanks!
Bill

Douglas Kryder

@William-Scott hi Bill, i have nothing on the issue you face but wanted to know what software you are using to track/report on the system?

William Scott

@Douglas-Kryder Not sure I understand the question. Could you clarify?

--Bill

Douglas Kryder

@William-Scott sure, what software was used to generate the report in the image/screenshot you posted to dropbox?

William Scott

@Douglas-Kryder Got it! That's just the Google Docs document application.

--Bill

William Scott

This problem has been isolated to a power supply issue. Well....that's good and bad.

I've been experimenting with two units side by side. One unit is powered by a nice switcher at 12 vdc. I built this one myself years ago with a multi-output core purchased from DigiKey. I can't seem to get this unit to fail.

The second unit is powered by an old linear, a cheapo unit from Radio Shack. I can't get this unit to stay alive, sometimes even to post boot.

Therefore I'll mark this topic as resolved.

I may still have the problem. The two units referenced above are on the bench. I have two more units in my back yard. The power source for them is a Solsum 6.6F solar charge controller. One of the two backyard units runs for days. The other runs for minutes to hours, hours if I'm lucky. Now I wonder if the solar charge controller can provide a suitable load current for peak moments. Looks like I'll be in the game of rigging up an experiment with a controller tonight.

Now...can anyone refresh my memory on how to edit the damn subject line so I can "resolve" this topic?

thanks!
Bill

György Farkas

@William-Scott said in O2+ shutdown (power distribution??) correlated with use of GPS Expansion:

Now...can anyone refresh my memory on how to edit the damn subject line so I can "resolve" this topic?

There were some forum motor 'improvements' during the last year:

simple posters can't upload files
no emoticons
no that sticked [Resolved] ... thread / folder
~~and it seems we can edit only the body of our post~~