Specifically, the USB2227, USB2228, USB2229, or USB2230.
I’m in the process of designing a board for my senior design project (with some work, an MP3 player). I am using a combination of a MAX1555 chip + a USB port for charging, and an SD card to hold the data. I was thinking it would be nice if I could get the SD card to show up as a mass storage device when its plugged in.
I stumbled across some chips from SMSC that seem to do exactly what I want, which is ‘serve’ the contents of the SD card as a mass storage device without too much dinking around on my part. It looks pretty straightforward - the datasheet makes it appear as easy as simply making the proper connections. I can’t, however, seem to find a source for them. The USB2228 is in digikey’s paper catalog, but not on their website. SMSC does not seem to provide samples.
It seems like the sorta thing SFE might consider stocking. I was very excited to find the VS10XX line of chips available here, I had also had some trouble finding them. This chips seem like an even better idea to stock - they appear to be very flexible! They have support for MMC, SD, CF, and more.
With that said, does anyone know anywhere else that might provide these chips or something equivalent? I think just about any from their lineup would have the features I need, so there is a bit of flexibility. I was somewhat surprised to find none of the big distributors I frequent (Mouser and DigiKey) carry any of the lineup. I’m doing board layout right now, so I don’t really need the chip, but it would be nice to have a pad set up in case I snag one in the future.](http://www.smsc.com/main/catalog/usbprods.html)
You’re encouraged to buy from Spark Fun, though if you would request the chips from others, they might add them to their catalogue.
In case your corporate policy requires a second supplier, the good news are that we sell also directly in any quantity to both companies and individuals. The bad news is that we require prepayment of a pro forma invoice with international bank transfer, which might cost you some extra. Also our single-chip pricing is decidedly steep, but you can order any chip. There are also some other web shops that sell our chips in Europe.
You’re encouraged to buy from Spark Fun, though if you would request the chips from others, they might add them to their catalogue.
In case your corporate policy requires a second supplier, the good news are that we sell also directly in any quantity to both companies and individuals. The bad news is that we require prepayment of a pro forma invoice with international bank transfer, which might cost you some extra. Also our single-chip pricing is decidedly steep, but you can order any chip. There are also some other web shops that sell our chips in Europe.
Thanks for the reply, but I don’t think I made myself clear.
I’m not a company looking for a second supplier, I’m a student. I’m not looking for a VS10XX (thanks to SFE!), I merely used that as an example of an oddball component some students/hobbyist might be interested in, that the big-name suppliers (Mouser, Digikey) do not sell in small quantities. What I am looking for is a SD card → mass storage device (USB) chip, such as the SMSC USB2230. I’m not sure who SMSC sells their chips to, but it seems like it could be possible for SFE to distribute it, so I thought I’d through my $.02 in.
I’m currently designing the PCB in eagle (as a side note, oh man is routing harder than I thought it would be).
I will be doing the soldering myself. Most of it at least. Some of the components are far too small to do by hand, so I will have to convince a grad student to solder them using the school’s fancy fancy hot air rework station.