03-08-2017 02:33 PM
I designed a circuit board to hold Intel Edison chip based on the schematic of Sparkfun Block for Intel Edison- Base<<a href="https://www.sparkfun.com/products/13045">https://www.sparkfun.com/products/13045>.
However, when I powered up the board I designed through micro USB, the Edison board makes a 1 second long cranking noise. (This never happens on the Mini-breakout board or Sparkfun base board) On the computer, nothing pops up. The serial port sometime pops up, but nothing communicates with the Edison board.
I attach the schematic. Any helps will be appreciated. I already found one mistake, USB_VBUS pin 20 is not connected to micro-usb VBUS. I'm not sure this is the cause for the mess.
03-09-2017 11:17 AM
Thank you for using the Intel® Edison platform.
Let us take a closer look at the schematic, however, we have to let you know that this is out of our support scope, so keep in mind that our suggestions may or may not work on your custom design. In the meantime, I would suggest you to check the Power section of the standard Breakout board schematic http://www.intel.com/content/dam/support/us/en/documents/edison/sb/mini_edison_breakout_hvm_8_26.pdf http://www.intel.com/content/dam/support/us/en/documents/edison/sb/mini_edison_breakout_hvm_8_26.pdf, and compare to know if there's something you're not doing besides USB_VBUS pin 20 not being connected to micro-usb VBUS.
03-09-2017 03:03 PM
We've noticed the following from your design, hopefully this information will be useful:
- VSYS and DCIN: In the Mini-Breakout Board schematic, these signals are directly connected between each other (not using anything like the BSS138) and they are connected to a power voltage between 3.15V and 4.4V. It's better to have a value close to 4.4V. The customer from this thread used 4.5V for example: /message/414569# 414569 https://communities.intel.com/message/414569# 414569. It seems customer based his design on the SparkFun's schematic.
- The UART interface runs at 1.8V, so make sure this is indeed the voltage level used.
- According to the discussion in this thread, VBUS should be connected to 5V so the Edison can work as the USB device. This might be the reason why the Edison is not being detected: /message/414569# 414569 https://communities.intel.com/message/414569# 414569. However, if the Edison is not powered correctly, then the issue might be in the power circuit.