| houkime | oh. here's another interesting ESD topic | 23:33 |
|---|---|---|
| houkime | How susceptible caps are to esd damage. | 23:33 |
| houkime | this is quite important for both SD and sim cards | 23:34 |
| houkime | because they have powerfeed pins that need to be decoupled | 23:34 |
| houkime | AND esd-protected at the same time! | 23:34 |
| houkime | And as you can imagine both of esd and decouplers need to be as close as possible to the pin. | 23:36 |
| houkime | So there's basically NO WAY you can protect these caps. They can't be far enough from esd interception point to be protected. | 23:38 |
| houkime | because otherwise they will be useless as decouplers. | 23:39 |
| houkime | So, how vulnerable are they? It seems like this depends to the large extent on their capacity, and anything uF-ish is ok and lesser caps are not really. | 23:42 |
| houkime | *not really defended | 23:42 |
| houkime | for SIM we have 1n caps and 220n caps. 220n is probably going to be ok. 1n may not. | 23:49 |
| houkime | And I don't really have exact datasheets on caps models in use. | 23:50 |
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