If you did manage to get them to start without a heatsink they're likely dead within seconds.
12Watts into an 8x8 package = very hot very quick. Most semiconductors have a maximum operating junction temperature of 125C, they tend to fail around 150C
Speaking from experience with BM1397, without a heatsink attached once configured and running they reach 85C in less than a second, so junction failure is a fraction of a second away.
Best guess is you've destroyed the ASICs by attempting to run them without adequate cooling.
Topic: BM1366 overheating (Read 9 times)
Hello.
Maybe, some of you can help me out. I designed a board with 4x BM1366 ASICs based on the Bitaxe and Bitaxe Hex.
The last couple of days, I tried to get it up and running, but I get no communication with the ASICs itself. The controller is sending data to it, but nothing is coming back.
What I observed is, that the current consumption is increasing when the chips are getting warm. And at the beginning, I had no heat sink (or a very simple one) on it. Could it be that the ASICs got damaged because of too much heat and current?
Additionally, I'm powering the 4 ASICs with 2.4V because 2 of them are in parallel an then they are in series with the other 2. So, overall core voltage need to be 2.4V. But what I see is, that the voltage is not equally distributed over the ASICs. The first 2 ASICs have 0.8V and the bottom 2 are supplied with 1.6V. May this be a sign that the ASICs are damaged?
Should the clock signal be available on the inverted CLK output pin of the ASIC? Because, I don't see anything there.
I hope someone can help me out.
Thanks,
Andreas
Maybe, some of you can help me out. I designed a board with 4x BM1366 ASICs based on the Bitaxe and Bitaxe Hex.
The last couple of days, I tried to get it up and running, but I get no communication with the ASICs itself. The controller is sending data to it, but nothing is coming back.
What I observed is, that the current consumption is increasing when the chips are getting warm. And at the beginning, I had no heat sink (or a very simple one) on it. Could it be that the ASICs got damaged because of too much heat and current?
Additionally, I'm powering the 4 ASICs with 2.4V because 2 of them are in parallel an then they are in series with the other 2. So, overall core voltage need to be 2.4V. But what I see is, that the voltage is not equally distributed over the ASICs. The first 2 ASICs have 0.8V and the bottom 2 are supplied with 1.6V. May this be a sign that the ASICs are damaged?
Should the clock signal be available on the inverted CLK output pin of the ASIC? Because, I don't see anything there.
I hope someone can help me out.
Thanks,
Andreas
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