Please let's get a standardized working design based on components that are readily available and screw with it after that is complete.
Topic: Klondike - 16 chip ASIC Open Source Board - Preliminary - page 95. (Read 435369 times)
Hello BkkCoins
I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
What do you think?
Thanks
Cheers!!
as mentioned, the PIC16LF1459-E/SS is a perfectly acceptable cross. So are the PIC16F1459-E/SS and PIC16F1459-I/SS.I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
What do you think?
Thanks
Cheers!!
The only difference is that the LF can run to a slightly lower voltage (1.8 vs 2.3) - I don't believe BKK's design runs the PIC that low though, so the F is fine.
Enigma
what about placing some connectors on the v2 design of K16 to piggypack a stronger powersupply on a addon board later?
Low priority feature request: Have some kind of identify command. Issue this command to a running/idle K16 to make its led blink in some pattern. I think cgminer has some provision for this.
There is already an Identify command, and all commands trigger an LED blink, though not in some pattern - just about a 1/4 sec flash.perfect
Low priority feature request: Have some kind of identify command. Issue this command to a running/idle K16 to make its led blink in some pattern. I think cgminer has some provision for this.
There is already an Identify command, and all commands trigger an LED blink, though not in some pattern - just about a 1/4 sec flash.
Low priority feature request: Have some kind of identify command. Issue this command to a running/idle K16 to make its led blink in some pattern. I think cgminer has some provision for this.
Turning K16 into a 20 chips board would make it direct competition with burnin's 20 chip boards 
(And I happen to have bought a number of chips dividable by 20 :p)
(And I happen to have bought a number of chips dividable by 20 :p)
dividable to 20 , it's also dividable by 10 
Turning K16 into a 20 chips board would make it direct competition with burnin's 20 chip boards
(And I happen to have bought a number of chips dividable by 20 :p)
(And I happen to have bought a number of chips dividable by 20 :p)
Hold that thought! IRQ announced the IR3847 SupIRBuck 25A back in March. Its pin-out is slightly different from theIR3895, but still in the PQFN 5x6mm package. Like the theIR3895, the IR3847 does not require a heatsink at its rated capacity.
Though there are two disadvantages. First it’s 25 to 50% more expensive than the IR3895 (no big surprise). The second issue is more pertinent - the availability of the IR3847.
http://www.irf.com/product-info/datasheets/data/ir3847m.pdf
http://www.mouser.com/ProductDetail/International-Rectifier/IR3847MTRPBF/?qs=%2fha2pyFaduh%2fXEfQX9qpOqsExJAQZ85xEuH%2ffjP3Ys6cnVXvB1KVwg%3d%3d
I didn't know about that. I guess it wasn't listed back in April when I started. Once I get hashing going I'll work on a board change to support this reg instead. This is the easiest, lowest cost way to get adequate current for over clocking. The problem will be factory lead times on a new product and sourcing the Cyntec inductor. Last time I went with the Murata due to difficulty tracking down the reference inductor. It's a bit less efficient using the Murata inductor but it's much more available. Though there are two disadvantages. First it’s 25 to 50% more expensive than the IR3895 (no big surprise). The second issue is more pertinent - the availability of the IR3847.
http://www.irf.com/product-info/datasheets/data/ir3847m.pdf
http://www.mouser.com/ProductDetail/International-Rectifier/IR3847MTRPBF/?qs=%2fha2pyFaduh%2fXEfQX9qpOqsExJAQZ85xEuH%2ffjP3Ys6cnVXvB1KVwg%3d%3d
Can this fan be helpful on this project, size: 92x92mm and price is 1,25euro
http://webshop.nedis.com/en-us/1111817/cmp-fan24
http://webshop.nedis.com/en-us/1111817/cmp-fan24
I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
I think we would have to consider the possibility of alternatives or change package.
You can also use the PIC16LF1459-E/SS. The only difference appears to be wider operating temperature range. (-55C to +125C v.s. -55C to +85C)
BkkCoins has also promised a QFN version of the board which will use PIC16LF1459-I/ML.
But you're right, the PIC is going to be the big bottleneck in this operation. With the number of chips ordered from Avalon, if only half get used in K16s, we're looking at a need for 14k+ PICs.
Yes, thanks for replys. I ordered some PIC16LF1459-E/SS , two weeks time for shipping.
Probably in this moment for assembly "ordered" boards. needed 6.000 PICs in next 2 month.
Everything happens - new boards dims, new controler etc.
Just wait positive tests from BKK
I bought a number of extra PICs just in case and possibly for future builds.
For DIY users i can provide some PIC16LF1459-I/SS if they cannot source it
For DIY users i can provide some PIC16LF1459-I/SS if they cannot source it
I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
I think we would have to consider the possibility of alternatives or change package.
You can also use the PIC16LF1459-E/SS. The only difference appears to be wider operating temperature range. (-55C to +125C v.s. -55C to +85C)
BkkCoins has also promised a QFN version of the board which will use PIC16LF1459-I/ML.
But you're right, the PIC is going to be the big bottleneck in this operation. With the number of chips ordered from Avalon, if only half get used in K16s, we're looking at a need for 14k+ PICs.
Yes, thanks for replys. I ordered some PIC16LF1459-E/SS , two weeks time for shipping.
Probably in this moment for assembly "ordered" boards. needed 6.000 PICs in next 2 month.
I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
I think we would have to consider the possibility of alternatives or change package.
You can also use the PIC16LF1459-E/SS. The only difference appears to be wider operating temperature range. (-55C to +125C v.s. -55C to +85C)
BkkCoins has also promised a QFN version of the board which will use PIC16LF1459-I/ML.
But you're right, the PIC is going to be the big bottleneck in this operation. With the number of chips ordered from Avalon, if only half get used in K16s, we're looking at a need for 14k+ PICs.
Also - is there any (practical) limit to how many k16's can be chained and controlled by a single computer running cgminer?
I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
I think we would have to consider the possibility of alternatives or change package.
You can also use the PIC16LF1459-E/SS. The only difference appears to be wider operating temperature range. (-55C to +125C v.s. -55C to +85C)
BkkCoins has also promised a QFN version of the board which will use PIC16LF1459-I/ML.
But you're right, the PIC is going to be the big bottleneck in this operation. With the number of chips ordered from Avalon, if only half get used in K16s, we're looking at a need for 14k+ PICs.
Edit:
With 256 PICs coming my way (90 in hand and 166 shipping July 11th), I may end up with a surplus. If anyone is short PICs in the future, let me know and I might be able to sell you some.
Hello BkkCoins
I am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
What do you think?
Thanks
Cheers!!
I ordered this from the manufacturer about a week ago and the lead time was 2 weeksI am worried with the availabilities of microchip PIC16LF1459-I/SS. Microchip information PIC16LF1459-I/SS Estimated Availability: 05-Aug-2013
I think we would have to consider the possibility of alternatives or change package.
What do you think?
Thanks
Cheers!!
For sure board price is connected with size.
Not that drastic though.What about adding another regulator and keeping everything else the same? Seems to be the easiest, all the supplies are tied together, right?
Well correction, the easiest is just populate ~14 of the chips and make more pcb assemblies.
I am an engineer with a background in aerodynamics/fluids and am capable of performing Heat/CFD simulations. Is there any way I can contribute to the heat sink/dissipation design. I can't promise anything but I can try if I had more understanding of what the goals/design are.
Goal: Keep shit cool, lol. Im sure you could grab the component measurements off the net or make a rough estimate based on the PCB pictures shown in the thread and make a rough, scalable design.
I need to know how cool. I need estimates of heat generation of the chips (at least) and possibly the other components on the board. Fan or no fan? Stock components or custom (for the heat sink)? etc.
I don't think any of the designs have needed fans thus far but i'm not sure if they've actually been tested
I don't think any stock heatsinks work with this, but it might be possible to find one that fits the square area and then CNC drill (or by hand) the 4x mounting locations for the K16 board.
I'm trying to figure out a good way to do heatsinking as well, it's currently a single point of failure with sourcing
(oh, and the thermal resistance to the top surface of the chip is massive because of the insulating material in the chip/carrier, so adding heatsinking onto the chips themselves wouldn't help)
For sure board price is connected with size.
Hm... i guess a bigger board wouldnt increase assembly cost very much. But a board with 2 chips less means one have to buy a complete board more for each 7 boards.
I hoped its not such a big thing to implement. The original avalon miner it seems, can be overclocked till 395MH/s instead 282MH/s but i believe i read they are stable at 375MH/s only. Maybe Klondikes can handle overclocking better and more stable?
Im not sure what to do. I tend to say chosing the boardsize that has the lowest manufacturing and assembly cost per chip is the best option. And when it has maximum overclocking capabilities.
I hoped its not such a big thing to implement. The original avalon miner it seems, can be overclocked till 395MH/s instead 282MH/s but i believe i read they are stable at 375MH/s only. Maybe Klondikes can handle overclocking better and more stable?
Im not sure what to do. I tend to say chosing the boardsize that has the lowest manufacturing and assembly cost per chip is the best option. And when it has maximum overclocking capabilities.
@Vigil: buck regulator switches of at 145°C +/- 20°C
see page 39 of the pdf, the IRF will be very hot.
http://www.irf.com/product-info/datasheets/data/ir3895m.pdf
@nekonos:
see https://bitcointalksearch.org/topic/m.2329781
see page 39 of the pdf, the IRF will be very hot.
http://www.irf.com/product-info/datasheets/data/ir3895m.pdf
@nekonos:
see https://bitcointalksearch.org/topic/m.2329781
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