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MB85RC64TA FRAM Trouble Writing/Reading [SOLVED]

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SiliconWizard:

--- Quote from: ANTALIFE on September 29, 2019, 01:42:00 pm ---When I do get out the logic analyser for the MB85RC64TA, the weird thing is that all commands are acknowledged and match up to what the datasheet says.

--- End quote ---

If your commands get acknowledged, then it basically means the chip understands them. If the data it puts out is invalid or all zeros whatever command you send, that's quite fishy. A totally borked IC or a problem with communication would probably yield commands to be NACK'ed. To further make sure there is no signal integrity problem, take a loot at the I2C signals with a scope. Logic analyzers are handy, but they don't show anything much if there's any signal integrity issue.

SiliconWizard:

--- Quote from: wraper on September 28, 2019, 07:55:17 pm ---Relabeled IC's don't look polished.

--- End quote ---

Well, it may not be a counterfeit, but it could very well be.
The worst counterfeits are not even polished or sanded. They are merely OVERSPRAYED before being marked again, and frankly, this exactly looks like a nasty overspraying job here.
Looking at the chips from their sides would confirm this - you should relatively clearly see a "line" between the top "resprayed" layer and the rest of the package.

wraper:

--- Quote from: SiliconWizard on September 29, 2019, 07:56:05 pm ---
--- Quote from: wraper on September 28, 2019, 07:55:17 pm ---Relabeled IC's don't look polished.

--- End quote ---

Well, it may not be a counterfeit, but it could very well be.
The worst counterfeits are not even polished or sanded. They are merely OVERSPRAYED before being marked again, and frankly, this exactly looks like a nasty overspraying job here.
Looking at the chips from their sides would confirm this - you should relatively clearly see a "line" between the top "resprayed" layer and the rest of the package.

--- End quote ---
FYI blacktopping does not look glossy as much as I've seen.



wraper:
Here are 2 another Fujitsu FRAM which are glossy on top and matte on bottom.

https://lcsc.com/product-detail/FRAM_FUJITSU_MB85RS2MTAPNF-G-BDERE1_MB85RS2MTAPNF-G-BDERE1_C189908.html
https://lcsc.com/product-detail/FRAM_FUJITSU_MB85RS128TYPNF-GS-BCERE1_MB85RS128TYPNF-GS-BCERE1_C189906.html

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