Bitcoin Forum
August 18, 2019, 12:20:50 AM *
News: Latest Bitcoin Core release: 0.18.0 [Torrent] (New!)
 
   Home   Help Search Login Register More  
Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 [29]
  Print  
Author Topic: [CLOSED] Bitmine CoinCraft A1 28nm chip distribution / DIY support  (Read 80831 times)
emdje
Hero Member
*****
Offline Offline

Activity: 683
Merit: 500


View Profile WWW
October 22, 2014, 09:20:29 AM
 #561

That depends on your board layout and voltage regulators. If you've got an A2 terminator I'd be quite interested in trying to reverse engineer this. Otherwise we likely need at least the schematics of the board.

So no means to change the voltage by software? I thought I read in this topic that it could be controlled by i2c?
1566087650
Hero Member
*
Offline Offline

Posts: 1566087650

View Profile Personal Message (Offline)

Ignore
1566087650
Reply with quote  #2

1566087650
Report to moderator
1566087650
Hero Member
*
Offline Offline

Posts: 1566087650

View Profile Personal Message (Offline)

Ignore
1566087650
Reply with quote  #2

1566087650
Report to moderator
1566087650
Hero Member
*
Offline Offline

Posts: 1566087650

View Profile Personal Message (Offline)

Ignore
1566087650
Reply with quote  #2

1566087650
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1566087650
Hero Member
*
Offline Offline

Posts: 1566087650

View Profile Personal Message (Offline)

Ignore
1566087650
Reply with quote  #2

1566087650
Report to moderator
1566087650
Hero Member
*
Offline Offline

Posts: 1566087650

View Profile Personal Message (Offline)

Ignore
1566087650
Reply with quote  #2

1566087650
Report to moderator
1566087650
Hero Member
*
Offline Offline

Posts: 1566087650

View Profile Personal Message (Offline)

Ignore
1566087650
Reply with quote  #2

1566087650
Report to moderator
hozer
Sr. Member
****
Offline Offline

Activity: 271
Merit: 250


View Profile WWW
October 23, 2014, 06:38:12 PM
 #562

That depends on your board layout and voltage regulators. If you've got an A2 terminator I'd be quite interested in trying to reverse engineer this. Otherwise we likely need at least the schematics of the board.

So no means to change the voltage by software? I thought I read in this topic that it could be controlled by i2c?

Can you take a picture of your hash board? How's it wired to the raspberry pi? Can you identify the voltage regulator/controller chip?
emdje
Hero Member
*****
Offline Offline

Activity: 683
Merit: 500


View Profile WWW
October 23, 2014, 07:24:46 PM
 #563

The board:

Is connected to the control unit, which is connected to the raspberry pi:
hozer
Sr. Member
****
Offline Offline

Activity: 271
Merit: 250


View Profile WWW
October 24, 2014, 01:22:31 AM
 #564

Here's my annotated image.. (the power connector at least look like mine, so I suspect we have somewhat similiar hardware, but I have not opened mine up yet)



So it seems like there are 4 voltage regulators (one for every 2 chips), and we'd need to know what part number they are. Sometimes the VRM (voltage regulator module) chips have I2c or some other direct digital interface to tell you stuff like power, set voltage, etc.

But the biggest problem is I think there's a mystery microcontroller on the board, which is likely what is in charge of setting up the VRMs. So we have to know what it is first. The best case is if we get support from the manufacturer, but unless it's Innosilicon, who might give you info because they want to sell chips, I doubt you'll get much.
Dexter770221
Legendary
*
Offline Offline

Activity: 1029
Merit: 1000


View Profile
October 24, 2014, 10:07:42 AM
 #565

It's very rare that voltage controllers have some control/monitoring over I2C, SMBUS or SPI. Those voltage controllers are propably from Linear LTCxxxx. Without extra rheostat (MCP4017 for example) in voltage loopback it's impossible to control voltage thru software.

Under development Modular UPGRADEABLE Miner (MUM). Looking for investors.
Changing one PCB with screwdriver and you have brand new miner in hand... Plug&Play, scalable from one module to thousands.
emdje
Hero Member
*****
Offline Offline

Activity: 683
Merit: 500


View Profile WWW
October 24, 2014, 10:09:02 AM
 #566

I have a very crappy photo to go on from my phone, but after some enhancement with  photoshop  Grin I think the component on the left is the following:

ARM STM32F303VC LQFP100

Datasheet: http://www.keil.com/dd/docs/datashts/st/stm32f3xx/dm00058181.pdf
Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 [29]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!