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'Erasing of EPROM and OTP?'
1998\12\09@053543 by Jochen Feldhaar

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Hello to the list,

I have been wondering if one could use some other kind of radiation to
erase the memory block in a plastic kind of EPROM or OTP microcontrollers,
because UV doen't penetrate plastic...
So I wondered if by using soft (i. e. long-wave) Roentgen radiation it
would be possible to penetrate the IC and transfer the necessary energy to
the memory cells in order to reset them. Of course, too much radiation or
too short a wavelength will damage the crystal structure and the
semiconductor.

So I wonder...did anyone on the list do any trials or do you have knowledge
of such methods??
Or is there another way?

(So it might be a good idea to be well acquainted with your local radiology
department in your hospital if this is workable!)
After erasing, they could be "blank checked" by the programmer, I expect
some ICs not to work after the radiation treatment.

Greetings,

Jochen DH6FAZ

1998\12\09@191637 by Peter Grey

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At 11:36 AM 9/12/98 +0100, you wrote:

A colleague of mine took a few OTP's to the local dentist and asked him to
irradiate them for the same time as he would a back molar. Presto! They are
blank.

Peter Grey
Neosystems

{Quote hidden}

1998\12\10@004331 by Scott Shidel...

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Speaking of which, is there any low buck ways to erase the eprom data
other than buying a 60 dollar UV lamp? I heard you can lay the chip in the
sun, but how long and does it really erase everything?


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1998\12\10@021415 by George Varga

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Hello to the list,

> So I wonder...did anyone on the list do any trials or do you have knowledge
> of such methods??
> Or is there another way?
Yes, I erased a plastic 16c58  twice. We have an CO60 gamma atomic
beam sourcer and I put there a programmed IC.
There was about 1-2 hours in it and it was totally erased but
unfortunetelly I can't repogram because there was a programing filure
after erasing.
I tried to erase once more it was succesfull but I can't reprogram
too.
I think the program memory is damadged.

Cheer George

1998\12\10@062726 by Octavio Nogueira

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>A colleague of mine took a few OTP's to the local dentist and asked him to
>irradiate them for the same time as he would a back molar. Presto! They are
>blank.
>
>Peter Grey
>Neosystems

Is this real? My wife is a dentist and I will try this today.

Octavio
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1998\12\10@091930 by Peter Grey

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At 09:12 AM 10/12/98 -0200, you wrote:
>>A colleague of mine took a few OTP's to the local dentist and asked him to
>>irradiate them for the same time as he would a back molar. Presto! They are
>>blank.
>>
>>Peter Grey
>>Neosystems
>
>Is this real? My wife is a dentist and I will try this today.

I believe my friend and he got it from a friend of his and wanted to check
it out personally. You have the perfect opportunity to try it. Let me know
if you can confirm this.

Peter
>Octavio
>==============================================
>Octavio Nogueira - .....nogueiraKILLspamspam@spam@propic2.com ICQ# 19841898
>   From the creator of ProPic,   ProPic 2  now much better
>     New ProPic 2 homepage:    http://www.propic2.com
>    PIC Programmer for Windows with down to earth price
>==============================================
>
>

1998\12\10@101742 by Nigel Orr

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>>>A colleague of mine took a few OTP's to the local dentist and asked him to
>>>irradiate them for the same time as he would a back molar. Presto! They are
>
>I believe my friend and he got it from a friend of his and wanted to check
>it out personally. You have the perfect opportunity to try it. Let me know
>if you can confirm this.

I'd also be interested in results- I may be able to get access to a
(veterinary) X-ray, and there's some stubborn code protected 16c620/JW's
here just asking to be zapped.  Can anyone come up with more details I can
give to the radiologist on settings etc?

Nigel
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1998\12\10@115545 by Reginald Neale

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>>>>A colleague of mine took a few OTP's to the local dentist and asked him to
>>>>irradiate them for the same time as he would a back molar. Presto! They are
>>
>>I believe my friend and he got it from a friend of his and wanted to check
>>it out personally. You have the perfect opportunity to try it. Let me know
>>if you can confirm this.
>
>I'd also be interested in results- I may be able to get access to a
>(veterinary) X-ray, and there's some stubborn code protected 16c620/JW's
>here just asking to be zapped.  Can anyone come up with more details I can
>give to the radiologist on settings etc?
>


There was a long thread about this on sci.electronics.misc a year or so
ago. The consensus from those who experimented with it was that, yes, it
can be done. But the X-ray photons are so much more energetic than the
visible light photons the device is intended to be erased with, that a flux
level that guarantees erasure is also likely to damage the device. So, this
is not a reliable way to erase OTP parts.

Reg Neale

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