andyfive Posted July 17, 2014 Report Share Posted July 17, 2014 Hello everyone, First off, I'd like to introduce myself, as I'm new to the papilio community. I am Andy.I had a question about the papilio one power supply. I uploaded a standard zpuino to the papilio, running simple code that sends a line to the serial port every second. After letting this code run for about a minute I noticed that the 2.5v regulator in the power supply was burning hot. Too hot to touch in fact! I have nothing connected to the board, and nothing is shorted out (eg the board is sitting on a plastic table while running). Is this normal? It makes me extremely nervous that its going to blow, and take the spartan with it. Any feedback or input is much appreciated. Thanks in advance! -Andy V Link to comment Share on other sites More sharing options...
hamster Posted July 17, 2014 Report Share Posted July 17, 2014 Are you sure that the Vcco jumper is correctly installed? Link to comment Share on other sites More sharing options...
andyfive Posted July 17, 2014 Author Report Share Posted July 17, 2014 Hello hamster,I believe so. It is currently set to 3.3v. This is not for any particular reason, as I do not have anything else connected. The board was simply set to 3.3 when I received it, and I had no reason to change it. Any ideas? Link to comment Share on other sites More sharing options...
Jack Gassett Posted July 18, 2014 Report Share Posted July 18, 2014 Hello Andy, It is normal with the Papilio One design for the linear voltage regulators to get hot when a design that uses a lot of power is loaded. ZPUino pushes the limits of the Spartan3e chip so it pulls a lot of power. One of the downsides of linear voltage regulators is that they do heat up, its the reason that the Papilio Pro changed to a more efficient switching regulator. No need to worry, lots of people are running zpuino on the Papilio One without problems, just excess heat. Jack. Link to comment Share on other sites More sharing options...
andyfive Posted July 18, 2014 Author Report Share Posted July 18, 2014 Thanks for the reply, Jack!This puts my mind at ease. I guess that I should have realized that the ZPUino put such a load on the fpga. I thought simple sketch = low power draw (still gotta get used to the differences between a micro and an fpga) .Anyway, I'm very excited to be a part of the community, and I'm loving the papilio! Now I've just gotta wait until the due is released. (Unfortunately I missed the kickstarter). -Andy Link to comment Share on other sites More sharing options...
alvieboy Posted July 19, 2014 Report Share Posted July 19, 2014 ZPUino does not have any idle instructions, so power is a bit high. This is due to the internal block RAMs on the FPGA - they do eat a lot of power, and since ZPU is a stack processor, almost all instructions need to use the block RAM. XThunderCore will have instructions for power control, and those will give a huge power advantage over ZPU. First release is scheduled for about Christmas. It will be compatible with IDE and standard libraries, as one would expect. Alvie Link to comment Share on other sites More sharing options...
andyfive Posted July 22, 2014 Author Report Share Posted July 22, 2014 Thanks for the info guys! I can't wait to check out XThunderCore. Link to comment Share on other sites More sharing options...
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