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PCB documentation - missing components designators on PCB
2014 年 09 月 15 日
01:22:15
Glaux
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2013 年 10 月 11 日
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Hi,
I have 86Duino Zero with SOM-128EX CPU module and on both PCBs there are missing designators of most components. Please could you upload on Github the PDF files with PCB top & bottom with designators for both zero and CPU board?

Second question is about PCI-E +12V lines - I cannot find where it's connected on schematics. Does this mean that the board is not powered from PCI-E slot and needs external power? Why? If so, I would solder a wire (there's a small copper area of 12V line near PCI-E edge connector) to power input jack...

2014 年 09 月 17 日
20:15:46
Android_Lin
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2014 年 04 月 01 日
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Hello, Glaux:

You can download the PDF file with SOM-128 PCB top & botton here:
http://www.roboard.com/temp/SO.....-128EX.zip
and 86Duino Zero PCB top & botton:
http://www.roboard.com/temp/86.....o_Zero.zip

In 86Duino Zero designing process, we considered that the 12V may hurt user PC motherboard, so the 12V on PCI-E connector does not connect with any one. (Need to provide the external 12V to it)
If use the external power, it is possible to solder a wire from PCI-E connector to power input jack, just notice that 12V does not touch/short any electronic element on 86Duino board.

2014 年 09 月 18 日
05:08:33
Glaux
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Thank you.
How could 12V hurt the MB? I would route it from PCIE connector via polyswitch and via diode to power input node where would be connected power jack via another diode. It may go via inner layer to protect against some shorts. I soldered a short wire from PCIE to VIN pin on power header, it works...

2014 年 09 月 18 日
22:53:20
Android_Lin
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2014 年 04 月 01 日
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Hello, Glaux,
You can solder a short wire from PCIE to VIN pin on power header but need to notice operation (ex. not plug another external power on 86Duino power jack if 86Duino Zero has plug on PC motherboard). Otherwise, may hurt PC motherboard.

2014 年 09 月 19 日
16:52:01
Glaux
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2013 年 10 月 11 日
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Sure, when I push the zero to the slot I use only ATX PSU and serial adapter. Also if someone push it to motherboard slot and leave it inside PC he probably would't want to wire external PSU inside PC case to power zero...

Please could you measure the power consumption @5V? I need some typical value for comparison, mine eats about 0,4A when SD inserted at DOS prompt...

2014 年 09 月 22 日
15:21:16
Android_Lin
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Glaux said

Please could you measure the power consumption @5V? I need some typical value for comparison, mine eats about 0,4A when SD inserted at DOS prompt...

I measured the power consumption with DC power supply.
For my 86Duino zero, it is 0.44A at 5V when SD inserted and running the "Blink" sketch:
http://www.roboard.com/temp/86.....urrent.jpg

2014 年 09 月 22 日
20:44:37
Glaux
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Thanks, thats match with my measurement. It's not much but the metal plate that has only few cm2 of surface seems to me be quite hot. I will probably add some greater heatsing on top. Yes, I promised make some exact temperature measurement, will be soon...

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