Electronics > Beginners
Replacing NVSRAM chip... external battery modification possible?
Mp3:
Hello all,
This professional audio unit i'm repairing has a 1Mbit SRAM memory chip wth a battery inside the chip package to store user settings and custom programs.
I have found a suitable replacement part: https://www.mouser.com/ProductDetail/Maxim-Integrated/DS1245Y-120%2B?qs=0Y9aZN%252bMVCVf6XAzbZp3eg%3D%3D
But I do not like the idea of using this, since it's not so likely this kind of memory will be available by the time it needs replacing again.
I'm trying to find out if i can use a plain SRAM chip and piggyback a battery holder to the SRAM chip's pins.
Would this be safe/possible? Thank you for your time.
AlcidePiR2:
You can dig out the battery from the old NVSRAM. Solder some wires and put an external battery holder that you glue on the chip.
BravoV:
--- Quote from: Mp3 on July 04, 2018, 02:28:50 am ---But I do not like the idea of using this, since it's not so likely this kind of memory will be available by the time it needs replacing again.
--- End quote ---
Or use parallel FRAM, doubt you need to replace it.
helius:
There are also SRAM devices with automatic flash backup: typically they are drop-in replacements for the battery-backed devices, but may require supply bypassing as the backup mechanism is sensitive to power glitches.
Mp3:
--- Quote from: AlcidePiR2 on July 04, 2018, 03:13:11 am ---You can dig out the battery from the old NVSRAM. Solder some wires and put an external battery holder that you glue on the chip.
--- End quote ---
Hmm. how can you safely do this without wrecking the chip? 8)
--- Quote from: BravoV on July 04, 2018, 03:30:15 am ---
--- Quote from: Mp3 on July 04, 2018, 02:28:50 am ---But I do not like the idea of using this, since it's not so likely this kind of memory will be available by the time it needs replacing again.
--- End quote ---
Or use parallel FRAM, doubt you need to replace it.
--- End quote ---
That would be very cool - so far i am only finding surface mount package 128kb x 8 FRAM, but i will keep looking!
--- Quote from: helius on July 04, 2018, 03:39:56 am ---There are also SRAM devices with automatic flash backup: typically they are drop-in replacements for the battery-backed devices, but may require supply bypassing as the backup mechanism is sensitive to power glitches.
--- End quote ---
I'll have to look into this as well, and good point since SRAM is quite picky about power...
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