AVR-Chat

Hi Davis,
visit my website at http://www.ustr.net, I am sure you will find lots of
good stuf. :)
http://www.ustr.net/memory.htm is a good one for memories.
http://www.ustr.net/smt/ is a good one for smd soldering.
enjoy.
Wagner.

techy fellow wrote:
> Hi Wagner,
>
> That's very kind of you to explain it in such detailed level. Gained
> alot from your explanation. As I'm a newbie, I will forget abt
> drilling holes. Anyhow, I'm into ATMEL and PIC, therefore, no point
> wasting effort in savaging the chip. I've savaged a LCD, a clock
> crystal (3.2768), a 33 Mhz crystal, a NE555D SMD chip (I think it is
> a 555 timer chip), etc.. I guess these already worth the USD3.80.
>
> Once again, Thanks alot for the help, Wagner. You have a wonderful
> weekend.
>
> cheers,
> Davis
>
> Wagner Lipnharski <wagner@ustr.net> wrote:
> techy fellow wrote:
>> Thanks alot for the fast reply. I managed to buy a discarded portable
>> hand-held device (I think it is for entering of PINs) real cheap. My
>> intention is to savage whatever is in there. The main item I'm
>> looking at is the 2 X 16 LCD panel (no back light). But I spotted
>> this chip on the PCB. Thought if I can make use of it, I will buy
>> some more. It cost about USD 3.80 per piece and it is considered
>> cheap even for the LCD itself. In singapore, the same LCD cost about
>> USD 7.80 when new.
>
>
> The 87C530, look for the "7" in the "87", this "7" means with internal
> customer programmable code memory.
>
> In the old days, anything with "7" means an eprom, like the 27Cxx
> (for eprom
> chips), 87C51 (for the 8051 with internal eprom), etc.   Being a
> 87XXX it
> means the chip comes out of the factory with the memory all "FFh",
> and it
> would be programmed by the customer.  It has a real eprom inside, the
> difference is if it has a crystal window or not.
>
> With the crystal window, you could erase the eprom (by using UV
> light) and
> reprogram again and again.  Crystal window (not glass) requires
> mechanical
> physical protection for installation, so the chip NEEDs to be done in
> ceramic.  Without the crystal window, the chip can be made in
> plastic, thus,
> lower cost, but then, once programmed the chip can't be erased, so
> the name
> OTP (one time programming).  Both versions, with the window or not,
> will
> have the same prefix "87C530", they are EXACTLY the same inside, if
> you
> could poke a hole over the OTP chip and expose it to UV it would
> erase, and
> would be programmed again, but chances are you would damage the chip.
>
> Wagner Lipnharski - email:  wagner@ustr.net
> UST Research Inc. - Development Director
> http://www.ustr.net - Orlando Florida 32837
> Licensed Consultant Atmel AVR _/_/_/_/_/_/
> December 26, 2003 12:34 pm
>
>
>
>
>
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