solderable micro-sd?

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#1
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Hello!

 

I need to use some flash storage in a corte-m0 uC. I want to use ASF to create a filesystem and forget about designing the driver for a flash memory. ASF supports micro sd cards, but I dont want to use a socket and a microsd, but a single chip and solder it to my board. Is there any flash chip compatible with micro sd? 

 

thanks, 

 

Jorge.

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Here's an interesting approach...

http://hackaday.com/2015/08/18/r...

 

Tom

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Yes - there is an "embedded" SD spec.

 

I think SanDisk do some ?

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There's emmc. But they tend to be in bga packages.
https://www.micron.com/products/managed-nand/emmc?show=true

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Maybe this

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You can get TSOP packaged SDIO/eMMC NAND flash with flash controller from the likes of Spansion and Micron.

 

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Some of the conductive epoxy datasheets state room temperature cure is possible though a relatively low temperature oven cure is quick.

http://www.mgchemicals.com/products/adhesives/electrically-conductive/

http://www.lord.com/products-and-solutions/electronic-materials/pc10678hv-silver-conductor

"Dare to be naïve." - Buckminster Fuller

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Now, we don't know how much flash is needed and access requirements and such.  But OP's goal is to "create a filesystem".  So, are you going to use FAT-compatible?  All the ASF provides (as far as I can tell) is indeed driver routines such as read/write sector.  Much of the other stuff is the necessaries for SD work, such as card detection and lock handling.

 

I'd think that there wouldn't be much "driver" work for a flash memory chip.  At my first glance, you may be making it harder on yourself.

 

Why is a solderable socket not acceptable?  Isn't that the same as attaching a "single chip"?

 

 

 

 

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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Lee, the sdcard is a simple solution to a complex problem. There's a lot of magic that happens inside. If we look at something like a 4MB serial nor flash chip we find the sector size is probably 4k. This usually means you need 4k of ram as a sector buffer vs 512 bytes for a sdcard. That rules out the majority of AVR chips due to ram.
If we look at the high density nand flash chips that we find in many electronic device with GB storage, then things get tougher. Again, they have large sector sizes, but you also need to do error correction and detection, wear levelling and sector refreshing. The controller in the sdcard hides all this evil from you. Once you turn off the sdcard freeway, the road tends to get a little bumpy.

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xinthauro wrote:

 

Maybe this

I have done exactly that on a number of projects.  Works like a charm.

"Experience is what enables you to recognise a mistake the second time you make it."

"Good judgement comes from experience.  Experience comes from bad judgement."

"Wisdom is always wont to arrive late, and to be a little approximate on first possession."

"When you hear hoofbeats, think horses, not unicorns."

"Fast.  Cheap.  Good.  Pick two."

"We see a lot of arses on handlebars around here." - [J Ekdahl]

 

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Hello!!

 

Thanks for all your replies. I want something to use as a professional solution so I can't solder a SD to the pcb or use 90deg pins. Socket and SD seems OK but maybe expensive, that's why I'm looking for something else. I will do some research with all the info you posted.

 

thanks !!

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Socket and SD seems OK but maybe expensive, that's why I'm looking for something else.

???  Again, how many are you going to make?  Sockets of various styles cost about US$1 in single quantities.  How much is your time worth to find alternate solutions, that may not be (IMO) as "professional"?

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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theusch wrote:

Socket and SD seems OK but maybe expensive, that's why I'm looking for something else.

???  Again, how many are you going to make?  Sockets of various styles cost about US$1 in single quantities.  How much is your time worth to find alternate solutions, that may not be (IMO) as "professional"?

 

In the begining about 100 units, long term maybe 5000/year

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So, if you discard header pins and direct soldering and sockets, then please describe the type of solution that wo0uld be acceptable and "professional"?  Don't all [?] cell phones and cameras and MP# players and the like have sockets?

 

You might reply:  "Well, those devices also have xxx MB of >>internal<< storage."  OK, then have you peeked inside some of these devices to see what they use?  You have already discarded using flash memory chips.  What kind of solution >>would<< be acceptable?!?

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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theusch wrote:

So, if you discard header pins and direct soldering and sockets, then please describe the type of solution that wo0uld be acceptable and "professional"?  Don't all [?] cell phones and cameras and MP# players and the like have sockets?

 

You might reply:  "Well, those devices also have xxx MB of >>internal<< storage."  OK, then have you peeked inside some of these devices to see what they use?  You have already discarded using flash memory chips.  What kind of solution >>would<< be acceptable?!?

 

Sorry, maybe I didn't choose my words right, my english is not the best =/

 

The device will be an AVL, and will be mounted on a vehicle. I think that is not the best to use a sd card and a socket because maybe the vibrations will affect the connection between the SD and the socket. I don't need more than some MBs of memory to store messages when the mobile data network is not available. Originally I thaught about a winbond flash memory but I found it hard to use. Winbond chip is W25Q32FVSSIG-ND (http://www.winbond.com/resource-...)

 

 

 

thanks!!

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jorge.ar wrote:

 Originally I thaught about a winbond flash memory but I found it hard to use. Winbond chip is W25Q32FVSSIG-ND (http://www.winbond.com/resource-...)

 

That would seem to be simpler, and most find those easier to use than SD ?

What size storage do you need, and with what file size and write cycling ?

 

I see SD chosen at largest storage sizes, where SMD chips are not as common.

 

There is an image on the last of this post, that shows SD cards in trays for P&P

http://www.dotmana.com/weblog/20...

 

Finding those SD cards in trays, will prove a challenge, let us know if you locate any ?

 

 

 

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Do-it-yourself, mounting it like a chip?

http://www.dotmana.com/weblog/20...

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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theusch wrote:
Do-it-yourself, mounting it like a chip?

http://www.dotmana.com/weblog/20...

Tom linked to that in #2 ;-)

"Experience is what enables you to recognise a mistake the second time you make it."

"Good judgement comes from experience.  Experience comes from bad judgement."

"Wisdom is always wont to arrive late, and to be a little approximate on first possession."

"When you hear hoofbeats, think horses, not unicorns."

"Fast.  Cheap.  Good.  Pick two."

"We see a lot of arses on handlebars around here." - [J Ekdahl]