Another idea, Andy seeded here, is to program your standard hex file, but
save a place for storage later.  This way your hex file is never modified
and can remain read only in your document control tree.

Power up the circuit, do your measurements, power it down.

Now program the cal factors to the saved location.

Remember that 00s in an OTP can be written over.

Craig

> It can be, but for really high volume it's cost-effective.  For
> small runs,
> you are better to add a couple cents to the circuit so you have pads which
> can be rx/tx data when in "not completely programmed" mode (ie, the EEPROM
> is empty).
>
> Andy
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