Yep, that's what I was talking about. The 55nm chips have some very neat specs that allow running on mostly bare chips in long strings.
The negative temperature coefficient is accounted for in my design using another peculiarity of the chips - the built in current mirror (CMQ). As I said the voltage is almost perfectly (blaming component tolerances mostly) balanced and the CMQ response is few nanoseconds
Will use RPI (initialy) mostly because I have a working miner with it and it will be easier to modify the code at runtime.
Level shifting is required only to the first chip 3V3 <-> 1V8 (actually ~1V6 = doubled core voltage). And (from my next post) the SPI speed should be so low that even a simple discreet elements LS should be fast enough, while SN74AVC4T774 will be used.
One farad at 400V ?!? Don't want to sell a kidney, so no, but yes - the filtering capacitor will be the most demanding part (will post about that in STEP 3)
but now ...
The negative temperature coefficient is accounted for in my design using another peculiarity of the chips - the built in current mirror (CMQ). As I said the voltage is almost perfectly (blaming component tolerances mostly) balanced and the CMQ response is few nanoseconds
I think , that power part of the design is not going to be bottleneck , here.
The SPI will be pain in the ass, You will have to use some kind of level shifting.
RPI is too much of a mess for my taste too
Sad but true. My next post will be about that, but so far it's not looking too bad.The SPI will be pain in the ass, You will have to use some kind of level shifting.
RPI is too much of a mess for my taste too
Will use RPI (initialy) mostly because I have a working miner with it and it will be easier to modify the code at runtime.
Level shifting is required only to the first chip 3V3 <-> 1V8 (actually ~1V6 = doubled core voltage). And (from my next post) the SPI speed should be so low that even a simple discreet elements LS should be fast enough, while SN74AVC4T774 will be used.
In particular, don't always assume that Vpeak/Vrms = 1.4, it varies widely with the load.
Or maybe just want want to go for the shock value and use one farad capacitors in your ripple filter, the ones that are used by the bass-heavy car audio enthusiasts.
But in this case the load varies with the voltage too, so they balance each other for free.Or maybe just want want to go for the shock value and use one farad capacitors in your ripple filter, the ones that are used by the bass-heavy car audio enthusiasts.
One farad at 400V ?!? Don't want to sell a kidney, so no, but yes - the filtering capacitor will be the most demanding part (will post about that in STEP 3)
but now ...