Mass production issue. ( the download firmware auto changed ? )

Jan 18, 2007 4 Replies
B

Hi All,



I have a couple of mass production issues, please advice:



Issue A. Step 1. The product was pass the ATE test, when it go through the production line. Step 2. Randomly choose fewer samples to do hand test. Step 3. Some samples fail, compare the firmware, it is different to correct firmware. ( but it pass the firmware check in ATE station! @@~)


Issue B. When test by hand and found a fail unit, the firmware is the same ( correct ), but behavior is different ( fail ) ( also pass the ATE test at beginning). In this case, we saw different EE behavior ( a power pin has different behavior, it should no voltage at this moment, but it has), but after re-download the firmware, the problem gone!


Please kindly share with your experience or any comments.



Thank you very much! Best regards, Boki.



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S

Both issues could be caused by a crappy supply supervisory circuit.

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F

Maybe your programmer is broken or out of date with the version(s) of chip you are programming?

I had some fun & games with PIC's that would program perfectly then fail on the job - a delve through the runes of the darker application notes revealed that the programming procedure was indeed changed between two steppings of the same chip. Upgrading the programmer software fixed this.

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C

Or, you are using a commercial module that has a default settings mode. You change the mode during the initial programming, but later, something is resetting the module back to its default settings...

Charlie

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J

Yep, that sure sounds like a dirty reset.

Regards, Joerg http://www.analogconsultants.com
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