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   "John Larkin"  wrote in message   
   news:kmhlbjt3ksvti8080moo983dgfa6ljul1r@4ax.com...   
   > On Mon, 12 Aug 2024 18:41:59 +0200, Lasse Langwadt    
   > wrote:   
   >   
   >>On 8/11/24 23:07, John Larkin wrote:   
   >>> On Sun, 11 Aug 2024 14:04:36 -0700, John Larkin   
   >>>  wrote:   
   >>>   
   >>>> On Sun, 11 Aug 2024 21:45:42 +0100, Andy Burns    
   >>>> wrote:   
   >>>>   
   >>>>> Surprised nobody has mentioned the Pico2 boards (based on RP2350A or   
   >>>>> RP2350B chips, instead of RP2040).   
   >>>>>   
   >>>>> 2x ARM cores plus 2x RISC-V cores (perm any 2 from 4)   
   >>>>> 150 MHz with FPU instead of 133MHz without   
   >>>>> lower power consumption   
   >>>>> more I/O pins (B model only?)   
   >>>>>   
   >>>>> I really ought to buy a couple for tinkering ...   
   >>>>>   
   >>>>> official boards not available yet, but 3rd party boards are, e.g.   
   >>>>>   
   >>>>>    
   >>>>>    
   >>>>   
   >>>> As of now, Digikey shows no stock on the Pico2 and doesn't recognize   
   >>>> the RP2350 chip as a product. Ditto Mouser.   
   >>>>   
   >>>> The fast floats look great. I wonder how fast they are.   
   >>>   
   >>> The RP2350 data sheet is 1347 pages!   
   >>>   
   >>   
   >>read the part on how the build in buck converter needs a custom inductor   
   >>with polarity marking to work, and tell there is something seriously   
   >>wrong with it   
   >   
   > The polarized inducor is strange.   
      
   I've had buck converters sensitive to inductor orientation before.   
   Last time was with MIC4576   
   It was sensitive to the orientation of an inductor with the winding   
   horizontal, similar to that shown in the RP2350 data.   
   But the inductor had no polarity markings.   
   It was changed to a stand up toroid which had no orientation issues.   
      
   > I'd expect that a small shielded   
   > inductor would work fine. It is interesting to have a switching   
   > regulator on a CPU chip... near a 12-bit ADC!   
   >   
   > The Pi designs struggle to save pennies and microwatts, which not all   
   > of us care about.   
   >   
   >   
   >   
      
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