6023e NEC FPGA smoking

[dave1111]

We've had 2 6023e boards go bad on us. The NEC D65654 FPGA on the board smokes. 

None of the signal conditioning and overvoltage protection ICs are visibly damaged.

And the FPGA is the furthest chip from the IO connector.

What could cause this? 

I wish I had more info than that, but I was not the observer at the time.

I was told that there was no power applied to the UUT when this occured.

Dave

[Seth_B.]

Hello Dave,

The digital inputs and outputs run directly into this IC.  An overvoltage or overcurrent situation on the DIO pins, or short to ground on an digital output could damage this chip.  Please contact us through ni.com/support to create an RMA request.  Continued use of the boards could lead to further damage.  I also recommend looking at your digital connections to determine if it's possible that any of them could have experienced an operating condition involving an overcurrent, overvoltage, or output short to ground situation.

Regards, 

[Ali M]

Message Edited by Ali M on 06-09-2010 05:14 PM

[dave1111]

Are there no signal buffers on the digital IOs?

[Seth_B. · Accepted solution]

On these legacy boards, the DIO is routed directly to the FPGA.  On newer boards, such as M Series or X Series, there is circuitry between the DIO lines and the FPGA.

Regards,

[dave1111]

What is the part # for the equivalent newer board?

[Seth_B.]

I would recommend the NI PCIe-6320, part number 781043-01.  I would still recommend double checking that the DIO lines for the board aren't being subjected to overvoltage, overcurrent, or short on output conditions as it is still possible to damage the card if you exceed the Maximum Working Voltage or current limits.

Regards,

[John_P1]

The NI PCI-6220 (779065-01) is another option if you want to keep PCI instead of switching to PCIe, although the 6320 has more features (mostly on the digital and counter subsystems) for the same price.

Best Regards,

[dave1111]

Thanks. Are any of the newer cards pin compatible with the 6023e?

[John_P1]

The pinout is essentially same for all 3 boards mentioned (an exception being pin 39 which turned into a Digital/PFI line on the newer cards instead of D GND).  However the newer cards use a different connector.  The SHC68-68-EPM should be a direct replacement for the SH68-68-EPM cable and will allow all 3 devices will work with the same terminal blocks or accessories.

Best Regards,