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Posts posted by Bianca

  1. Hi Bruce,

    It's ok, You confirmed what I thought the issue was... There is something, and I suspect the current protection (IC13), that is defective and is putting the Dialog power supply under stress. 

    I will send you a private message regarding the purchase details of the board, to see if it's still under warranty. If it's not. I would suggest replacing IC13 (NCP380HMUAJAATBG) and try again; if you can't find the part on stock, you can also try to bypass it. But this will leave the board exposed to short circuits and overcurrent. You can check the schematic here.



  2. Hi @Bruce_W,

    If the LED is blinking it means that the 3.3V power supply is not working constantly. I don't know if with a multimeter we can see the behavior, probably just with a scope, but if you have a voltmeter/multimeter, please try to measure the voltages on, C208, C176 (or C177) and C178 (or C179) while you power the board from the PC with the USB cable. It will average the values, but if the power supply is that unsteady, you might be able to see some fluctuations. There's an overcurrent protection IC on the path when using USB power. I suspect that to be the cause of the problem.



  3. Hi @MattC,

    Sorry for the delayed answer. Can you tell me if it shows at all in device manager when you connect the board? Like anything, even unknown device. If so, please please let me know what it shows. Please also go to properties -> Details -> Hardware IDs and send me the HW ID. 

    Have you tried connecting it to another computer? 




  4. Hi @Samuel Quiniou,

    Sorry for the delayed answer. There are no board files for REV E. The only difference between rev E and rev D that might affect your design is the memory. Due to a discrepancy in the manufacturing process on these board a different DDR part was loaded on the board. This memory had the double amount of the original Rev D. We tried to collect them all and replace them with boards with the original memory because none of the available resource materials worked with them directly. We can do the same for you if your board is affected. 

    However, if you want to use the Rev E with the bigger memory, we've put together a set of instructions on how to upgrade the projects: 

    You'll still use the same rev D board files. If you want a corrected board, please let me know.



  5. Hello,

    That part has an absolute rating of 6V. The fact that it happened when you switched from REG to USB makes me think that the USB power supply/HUB you were using might have provided a higher voltage. When using the REG, the 5V is created by another power supply, so as long as the 12V power supply you are using is fine, the board should work without problems, and no damage can be done to the board. 

    However, when you power it via USB, the voltage is not limited by anything. If your USB is capable of giving more that 5V by design, (for example Samsung chargers are capable of providing 5V and 9V. The voltage negotiation is done by Samsung devices. Someone tried to power one of our boards with a Samsung charger, it worked for a couple of times, and then it burned the board) or by defect, some components might get damaged. 

    That component though, received some significant damage so I am not sure it was caused by a slightly over voltage. It might also be a component manufacturing defect that caused it to fail quickly. 

    I will private message you for some details regarding your purchase/warranty and see what can we do about it. 




  6. Hi @nickcamel,

    I had to request personal information regarding the purchase of the board, therefore the discussion was moved in private conversation. 

    If you are experiencing issues with your PYNQ, please give us some details about the specifics of your problem and we'll help you troubleshoot.



  7. Hi @Leo_W,

    So, I will try to explain to you something from that schematic.... I see that you opened a lot of topics, some of them answered by my colleagues. I suggest you keep all the questions related to a board, or to the same problem in the same topic, otherwise, we can't follow up with you. 

    You asked about IC20... That is an LDO that makes the FT3V3 from the USB 5V0... all the FTDI environment is powered by that FT3V3. 

    Like I said previously in a topic, the FTDI has an internal LDO that makes generates the voltage for the core. Initially I thought the FTDI was powered from 5V0 so it made a 3V3 but in this particular circuit, it's powered from FT3V3 and it makes the FT1V8. 

    I'm telling all of this because:

    - IC5 is an EEPROM. It is powered from FT3V3 and has pull-ups to FT3V3 and everything that comes from the FTDI is also 3V3.... I don't know on which pin you measured 1V but unless a component from the whole environment is burned internally, you wouldn't be able to see 1V... If IC20 would be burned you wouldn't see anything. 

    -If you really see 1V instead of 3V3 it means that the FTDI is actually powered from 1V. The minimum requirements for the FTDI is 3V. I mentioned before that it has an internal LDO that makes 1V8 from 3V3 for the core.... it is physically impossible to make 1V8 from 1V0, therefore the FTDI shouldn't work at all. 

    -The fact that you can see the board in device manager even if it's not correctly recognized, implies that the FTDI is working, therefore you have at least 3V on FT3V3. With just 1V, nothing should've shown up. 

    I am still bugged by that 1V, which I don't know where you measured, since you said you don't know the chip part number, but for now we'll try to see if we can al least communicate and reprogram the EEPROM. If that works, you don't have an electrical problem, but a driver one. 

    It'll send you a private message with some instructions.

    Best regards,


  8. Hi @Leo_W

    In this picture your board is turned off. Does it power when you switch it on? Does the power led go on? What do you mean by weird voltage on the VCC pin of IC? What did you measure there?

    If the board does power on, can you tell me what shows up in device manager? If anything at all, even if unknown device, give me the Hardware ID..



  9. Hi @Leo_W,

    That's an internal voltage generated by the FTDI... There's a missing page in the schematic that includes the programming solution which is a proprietary design.

    Best regards,


  10. @BALA,

    Well, you seem to have a short circuit to the 3V3 rail. I don't know if all the others are functioning well. If you can find the short circuit and remove the component that's causing it and replace it with another one, your board should work again, if the other rails are fine. Check the schematic for the 3V3 rail and try to look at the board. Maybe there is a component (capacitor/resistor) visible burned and you can remove it.



  11. Hi @BALA,

    Can you please give me more details with the work you were doing when the board shut down? Were you using external devices on the IOs? I need details like, was the board powered just with usb or through AUX? Were you touching the board at that point?

    You said you checked the PS voltage drop to 24V... This is confusing... You meant 2.4V? Where did you measure?

    Is the board not functioning just with USB or also with AUX?

    If you tried just using the USB, is it possible to power it through AUX as well and see of it works?

    Can you please measure some voltages on the board? 

    If you power through aux: C137 , C144 (they are both near the power Jack)

    If you power through USB: C146 (see the marking below TX LED, below USB)

    In the same area around IC11, please also check the voltage on : C124, C127, C120


    If one of those fail to provide any voltage, please turn off the board and check for short circuit on the rail. 




  12. Hi Takashi,

    I am not very sure what you are asking. If you are referring to the XADC Pmod, I can tell you that this is wired to the auxiliary analog input pins of the FPGA. The pins can be configured as analog input, or digital input/output. The XADC is a dual channel 12-bit ADC converter and can go up to 1MSPS.

    The VCC pin of the Pmod is able to provide 3.3V . The FPGA Bank (Bank 15) where the analog pins are connected is also powered at 3.3V.

    If you want more information about the XADC and how you can use it, you can check the Xilinx UG480

    For other information you can also check the Reference Manual: