diy NVRAM

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

Post by festy »

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 14178 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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antus
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Re: diy NVRAM

Post by antus »

I like :afro:
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
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VL400
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Re: diy NVRAM

Post by VL400 »

Nice one :thumbup:
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Holden202T
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Re: diy NVRAM

Post by Holden202T »

frankennvram!
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festy
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Re: diy NVRAM

Post by festy »

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 14148 times
diynvram_pcb3d.jpg
diynvram_pcb3d.jpg (16.28 KiB) Viewed 14148 times
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Jayme
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Re: diy NVRAM

Post by Jayme »

big thumbs up mate :thumbup: can see myself owning a few of these in the near future.
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The1
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Re: diy NVRAM

Post by The1 »

sweet nice work
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Re: diy NVRAM

Post by VX L67 Getrag »

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

I would def like some of these too!
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Holden202T
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Re: diy NVRAM

Post by Holden202T »

what does the height work out like compared to a nvram ?
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festy
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Re: diy NVRAM

Post by festy »

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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