This puzled me because the 4 circuits on PWM12 was copied from the working motor controller, but looking at the schematics I suddenly realized that 3.3V out from the buck converter is connected to ground – which explains why I draw 10mA++ extra current and why the internal logic don’t respond – it was shorted.…
This screen shot is from MC3X60V3A that also uses DRV8313. I fired it up and looked at code because I need a reference as I try to understand the errors I have on the PWM12 board. I use the same circuit, so I am puzled. Trapsoidal algorith is a 6 step brute force algorithm where…
I have used DRV8313 in a project before and it worked well, but on my PWM12 Hat I seem to have 2 busted chips so far. I selected both from the same batch, so I will add a 3rd from a different batch and see if it works. PWM12 is a very simple Hat and…
We are getting closer to x-mas and I am about to start setting up led strings in my garden. I have a load of 12V and 24V led strings, so I plan using my PWM12 Hat as LED Driver as illustrated below. The system set up is straight forward – I use a number of…
A quite like UML State Diagrams as they give a good high level view of what happens in the code on functional levels. I was first introduced to this by a tool that actually let you create embedded code. This overlap a bit with PLD, but it creates a better overview of event-flow and an…
This demo is a bit in the early stage, but I am using C# and .NET 4.7.2 for a simple test. I developed in C# a few years back and was a bit dissapointed over performance. But, I notice that this have improved dramatically with later .NET versions so I am putting it up for…
I have so many Hat’s by now that I try to make some systematic documentation on them. This drawing is part of what I call “Annotated Schematics” to document the design and collect notes needed for working on the Hat. This example is one of my more powerfully Hat’s as it contains 12 separate…
I have started assembling the first PWM12 board and this is the current sensor I use. It will probably work ok, but the circuit lack two important components. One a small capacitor between CSense and ground and secondly a TVS between the same. The reason is I could have needed those to protect the MCU…
This is basically the same diagram as I drew before, but with a few more details.
Soldered up a new board just to realize that DRV8301 was bust as well, so replaced DRV8301 and Buck converter is actually working. I am getting 3.4V just enouth for SPX3819 to give 3.2 out and the MCU ticks at 168Mhz. Looking at datasheet I also see that I have done correctlt – EN_BUCK should…