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I Made a PCB Business Card with NFC. Go Ahead, Reuse My Files!

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salvagedcircuitry:

--- Quote from: Zip on November 22, 2019, 12:31:24 pm ---How do i flash or write info to the xqfn-8 nfc chip?

--- End quote ---
The NFC chip handles all communication via a paired NFC coil. So it can be completely programmed through "NFC tools" an android app for programming NFC chips. It can also be programmed via the NXP NFC android app.

salvagedcircuitry:

--- Quote from: thinkfat on November 22, 2019, 08:22:22 am ---Suggestion, make it double as a soldering exercise. Instead of just footprints, make it do something and put a link in the QR somewhere that leads to assembly instructions.

--- End quote ---
This is a great idea! I am in the process of making a cell-phone-repair edition of this business cards, so people who are practicing reballing / reflowing random Apple A-series chips and qualcomm arm chip alternatives have something to practice on. It will probably be a one-time-use thing as I don't think the tg-130 used in cheapo board houses will hold up very well to resoldering more than once (traces will pull up / tear). Debating whether it is better to have the bga pinouts break out or just let the end user band saw them in half to inspect the joints. Thanks for the great input guys!

salvagedcircuitry:
Bonus: Who doesn't love a PCB manufacturer fight?
This is pcbway:




This is JLCpcb:



Both vendors have a very similar out-of-center tolerance, but the soldermask quality seems quite different. Granted, this is apples to oranges comparison. Pcbway green soldermask could be better. However, it seems that Pcbway doesn't bridge soldermask if an opening is less than 0.25mm or 0.2mm. These images are also not super flat as I was using a very cobbled-together setup. I finally got my hands on a macro, so better images incoming :D



I'm not part of any discount program with any pcb vendor and have not signed up for any "review" Discount / payoff.
I'm planning on sending these to OshPark and advanced circuits to check out their capabilities. I think both these vandors will have far better centering. Sure, it'll cost more, but I can't wait to find out.

OwO:
You are using the 2 layer process right? The 4 layer process of JLCPCB is far better and this is true of probably all other boardhouses as well. The 2 layer process is built down to extreme cost and can't really be fairly compared to advanced circuits because they charge as much for 2 layer boards as JLC charges for 4 layer boards.

OwO:
JLCPCB 0.2mm drills, 0.125mm annular ring:




0.4mm BGA pads:


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