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Add ESD protection to the u.FL connector area #18

Closed brandoaire closed 9 years ago

brandoaire commented 9 years ago

We discussed with a u-blox tech the possibility of adding ESD protection to the u.FL connector to prevent damage to the internal TX and RX lines of the u-blox module. The details are included in the application notes for the G350 and U260/270. It would include adding a single capacitor and an inductor, I think. @technobly would know.

technobly commented 9 years ago

screen shot 2015-08-13 at 8 38 21 pm

C3 and L2 are the required ESD components. p.109 - SARA-G3 and SARA-U2 series - System Integration Manual

C3

SARA:U2: 15 pF Capacitor Ceramic C0G 0402 5% 50 V - GRM1555C1H150J - Murata SARA-G3: 0 ohm jumper 0402

L2

SARA:U2: 39 nH Multilayer Inductor 0402 (SRF ~1 GHz) - LQG15HN39NJ02 - Murata SARA-G3: Do not install

C2

may not be necessary, double check with u-Blox.

brandoaire commented 9 years ago

After further discussion, we've decided that that the marginal amount of protection that this will add to the PCB is not worth the expanded board size and potential impact on the RF network. No need to implement.