Jumpers and Voltage options

[albercook]

I'm sorry if I missed it but what are all the jumpers on the Digispark pro for and how do you select different operating voltages?

In the comments on the kickstarter Erik mentioned that it can run at 3.3-3.6v,4.5-5.5v,or 6-16v. I get how you would connect it for the 6-16V that is what the regulator is for. If I want to run it from a LiPo cell the voltage will start around 4.2V and drop to 3.3V. That covers the two lower ranges.

When would one solder the zener diode jumpers?

Thanks

[albercook]

It seems that if the solder pads on the diodes were open that the on voltage of the two USB lines would be to high.

I'm also not clear on the PREVCC designation. What does it mean that the line between D3 and the fuse is labled PREVCC?

If there is a document or a page on the wiki that explains all this please point it out to me.

Thanks

[albercook]

Sorry to pester but I really have looked all over. Can I run thr digispark from a single LiPo. Will the clock run fast enough to do the V-USB if the device is not power from the computer USB?

[defragster]

Not having seen the KickStarter text recently I can guess the lower voltage support and LiPo was intended to be used with this add on: http://digistump.com/wiki/digispark/tutorials/lipo

That will boost the LiPo voltage to a usably high range and allow it to be charged as well.  These shipped from the Kickstarter but not yet in the store.

If there is another means to run it at different voltages you should find it in the Wiki as the planned user 'edits' usually are - I scanned and nothing came up.

[digistump]

You can use a Lipo directly to the VCC/5V pin - of course everything will be running at the 4.2-3.3v lipo voltage then, but it does work (though it is out of spec at 16mhz)

Solder over the zener jumpers if you run 3.3v or under - but with a lipo I'd leave them as is.