Rafael Ignacio Zurita wrote: > No yet. There is not connection between vout33 and vdd. > I wanted to check the vout33 first, before to do those connections.
If you want to play it extra-safe, you could power VDD from a lab supply and power 5 V from USB (or another lab supply, if you have one). With VDD powered, the system will be in a defined state. Then the regulator has no excuse for not working :) But I wouldn't worry about VDD possibly getting a bit too high, and just make sure the system can't burn too much power. See below. >> Also, the regulator may need a minimum >> external load of a few uA before it actually can regulate. > > It does not. At least when checking with tester. Hmm, the tester may not provide enough of a load. If things still don't work after powering VDD, maybe add some 1-100 kOhm resistor between VOUT33 and GND. > usb port and using 5v from a pc power supply. For such things, I'd strongly suggest to use a lab supply. If you set a low current limit (e.g., 20-50 mA), there is little risk of anything getting damaged, even if you made some bad mistake. Up to a certain point, a low current limit also helps to prevent damage if you run with an incorrect (or reversed) voltage. If you're working with a supply that can provide several ampere, you can easily burn up your circuit if something isn't quite right. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
