diy NVRAM

EPROM EEPROM SRAM NVRAM Flash chips, reading/writing hardware and software
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diy NVRAM

Postby festy » Mon Aug 22, 2011 10:18 pm

DS1245Y ICs too expensive? Then why not make your own? ;)

Take one 128k low power CMOS SRAM chip (681000,628128 etc), add a memory controller IC and lithium battery,
and you have a DS1245Y-70 compatible NVRAM for about $10.
It programs set as a DS1245Y device, and has the added advantage that you can change the battery when it's flat instead of binning it.

Here's my dead bug style prototype - don't laugh, it actually works :D
diy-nvram.jpg
diy-nvram.jpg (42.54 KiB) Viewed 6823 times

I might get a couple of pcbs made up - for some reason that one looks a little too fragile to stick in an ecu, but nothing a bit of hot glue couldn't fix :lol:

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Re: diy NVRAM

Postby antus » Mon Aug 22, 2011 10:23 pm

I like :afro:
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: diy NVRAM

Postby VL400 » Mon Aug 22, 2011 10:26 pm

Nice one :thumbup:

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Re: diy NVRAM

Postby Holden202T » Mon Aug 22, 2011 10:40 pm

frankennvram!

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Re: diy NVRAM

Postby festy » Tue Aug 23, 2011 11:38 am

A slightly less dodgy looking design - it could also be done on veroboard easy enough.

diynvram_pcb.jpg
diynvram_pcb.jpg (24.92 KiB) Viewed 6793 times

diynvram_pcb3d.jpg
diynvram_pcb3d.jpg (16.28 KiB) Viewed 6793 times

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Re: diy NVRAM

Postby Jayme » Tue Aug 23, 2011 11:54 am

big thumbs up mate :thumbup: can see myself owning a few of these in the near future.

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Re: diy NVRAM

Postby The1 » Tue Aug 23, 2011 1:00 pm

sweet nice work

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Re: diy NVRAM

Postby VX L67 Getrag » Tue Aug 23, 2011 2:30 pm

Thats very bloody nice & 2nd edit looks tidy as!

I would def like some of these too!

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Re: diy NVRAM

Postby Holden202T » Tue Aug 23, 2011 3:09 pm

what does the height work out like compared to a nvram ?

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Re: diy NVRAM

Postby festy » Tue Aug 23, 2011 4:22 pm

about 11mm, compared to 9mm for a DS1245Y.
Is height an issue with certain PCMs? I've only played with 808s...

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