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Visitor cindyott
Visitor
740 Views
Registered: ‎02-12-2019

Measuring Kintex 7 operating temperature

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Hello -

I am trying to operate a Kintex 7 industrial-termperature part near its maximum operating temperature.

To do that, I need to know the junction temperature of the device. I am therefore

usinging iSE iMPACT -> boundary scan -> Get Device ID and reading the reported

current temperature and VCC values.

This procedure works fine at low operating temperatures. The chip has a heat sink

on top of it, and at room temperature (20C), the heat sink reads 39C and the chip's

current temperature reads 38.74C. (VCCInt = 1.017-1.020, VCCAux = 1.183).

I then heat the back of the PCB, through a steel plate and a heat pad, using a heat gun,

and read the current temperature and voltages about once each 2 seconds.

The voltages stay constant (VCCInt = 1.017-1.022, VCCAux = 1.183). The temperature rises

gradually (about 0.5C per reading) until about 85C, at which point iMPACT fails.

(FYI - it fails in one of two ways. Sometimes it says that it has failed and does not give a

reading. Other times, it give nonsense readings (temp = -124.85, VCCInt=1.872, VCCAux=1.997)).

I have seen iMPACT work at up to 100C when I was measuring a commercial (!) grade part, so this

does not seem like a problem with iMPACT, although the cable connector and room temperature

around the pod might have been slightly higher when the readings failed at 85C. The heat sink

measured 55-59C during and after the failure.

We scanned the FPGA after it was installed on this board using the XilinxGO App to verify that

this was an industrial part.

The question is: Why would iMPACT fail on an industrial grade part at 85C? Is there anything wrong

with my procedure? Is there a way to get the same kind of readings using Vivado? Is there any chance

that this is really a commercial grade part, in which case the results would make sense?

Cindy Ott

Design Engineer

Picture Elements, Inc, for Ametek, Inc.

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Xilinx Employee
Xilinx Employee
719 Views
Registered: ‎08-25-2010

回复: Measuring Kintex 7 operating temperature

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Hi @cindyott,

 

It should be correct if Xilinx Go confirmed this is an industrial device. The temp rise might be too soon while the junction temp is higher, so you can monitor the junction temp in Vivado:

 

Thanks
Simon
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Visitor cindyott
Visitor
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Registered: ‎02-12-2019

Re: Measuring Kintex 7 operating temperature

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There was a typo in my intial statement.

At room temperature, the current temperature from iMPACT

reads 58.74C, not 38.74C.

Cindy

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Xilinx Employee
Xilinx Employee
720 Views
Registered: ‎08-25-2010

回复: Measuring Kintex 7 operating temperature

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Hi @cindyott,

 

It should be correct if Xilinx Go confirmed this is an industrial device. The temp rise might be too soon while the junction temp is higher, so you can monitor the junction temp in Vivado:

 

Thanks
Simon
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Observer matifrenkel
Observer
695 Views
Registered: ‎01-11-2019

回复: Measuring Kintex 7 operating temperature

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The XilixGO scan show that this is 1I devcie

 

Mati

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683 Views
Registered: ‎01-22-2015

Re: Measuring Kintex 7 operating temperature

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Hi Cindy,

-a couple of thoughts:

The SYSMON (UG908  and here) shown by @simon also allows you to monitor FPGA voltages.  Ensure that none of them go out of spec (ref DS182) during your test.

Document, DS593, for the pod (Platform Cable USB II) says in Table 7 that absolute maximum ambient operating temperature is 70C.

Cheers,
Mark

 

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Observer matifrenkel
Observer
673 Views
Registered: ‎01-11-2019

Re: Measuring Kintex 7 operating temperature

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I wanted to clarify that the temperature raise mentioned in Cindy's report is ONLY of te FPGA and the PCB and NOT the iMPACT POD. The iMPACT POD is in room temp conditioin. 

Mati

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Visitor cindyott
Visitor
620 Views
Registered: ‎02-12-2019

回复: Measuring Kintex 7 operating temperature

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I redid my test, monitoring it with Vivado and raising the
temperature very gradually. Vivado continued to work
up to 100C, at which point I stopped the test. The voltages
were in range the whole time. Thank you for your help.
Cindy
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