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Basti3n's avatar
Basti3n
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4 years ago

ARRIA 10 temperature sensor: 25 Celsius degree offset

We have some issue at work with a couple of ARRIA 10 FPGA temperature sensors reporting the wrong temperature value. It seems to always have an offset of around 25 degrees, compared to another on-board sensor and compared to the value usually reported on boards from the same batch.

The issue was first seen on one board. The FPGA was replaced but the issue remains. The same problem was detected on another board.

I double-checked the transfer function in the datasheet and saw it was wrong and has been updated. It still does not explain the +25 offest we see.

The FPGA used is an 10AX032H3F34E2SG. Has anyone had such issue before?

4 Replies

  • Ash_R_Intel's avatar
    Ash_R_Intel
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    Hi,

    Can you please elaborate?

    Are you using Internal TSD + Temperature sensor IP or External TSD?

    What do you mean by another on-board sensor? How is it connected to the FPGA?


    Regards


    • Basti3n's avatar
      Basti3n
      Icon for New Contributor rankNew Contributor
      4 years ago

      Hi,

      Thanks for the reply and sorry for the lack of details. We are using both the internal TSD with sensor IP and the external TSD connected to a sensor chip. We see a difference between the 2 values of ~27 Celsius degrees. On all the other boards produced except the two I mentioned, the difference is a couple of degrees.

      These 2 values are basically checked on each card at production time, and since they know differ and do not match the expected, we are trying to find out if this could be something wrong with the FPGA itself.

      Regards

    • Basti3n's avatar
      Basti3n
      Icon for New Contributor rankNew Contributor
      4 years ago

      Hi,

      Thank you for your reply. Actually this is an old image built with Quartus Prime Pro 17.1.1. The same build is used on all the cards.

      Regards