diy NVRAM

[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

diy-nvram.jpg (42.54 KiB) Viewed 16699 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

[antus]

I like

[VL400]

Nice one

[Holden202T]

frankennvram!

[festy]

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

diynvram_pcb.jpg (24.92 KiB) Viewed 16669 times

diynvram_pcb3d.jpg (16.28 KiB) Viewed 16669 times

[Jayme]

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

[The1]

sweet nice work

[VX L67 Getrag]

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

I would def like some of these too!

[Holden202T]

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

[festy]

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