Hi,
I’m doing footprint for Iridium 9523, and need a advise.
I like to know, the best way to make ground insulation (without F.Mask) like they recommend in datasheet Pag.14/Figure 5.
Thanks
Hi,
I’m doing footprint for Iridium 9523, and need a advise.
I like to know, the best way to make ground insulation (without F.Mask) like they recommend in datasheet Pag.14/Figure 5.
Thanks
Solder resist is not a reliable insulator.
Normally I use a piece of mylar sheet cut to size when I need insulation.
Have you noticed the date of the module datasheet, 8 years old. Is it available and unchanged after so long?
I’m not sure you understand the datasheet, or I don’t understand your terminology. You don’t need ground insulation, the intent is ground plane connection for RF shielding.
Figure 4 is giving relative dimensions for the index and mounting holes. (The index holes are for the tips of the 4 top can screws and the center stud of the aluminum frame.) You want the gasket on the aluminum frame to make good electrical connection to the ground plane of the board you are mounting this to, and I have yet to find a drawing giving good dimensions for the 1mm “trace” for the gasket. See back on page 12 for Figure 2 for the placement of the connector. So annoying that you need multiple drawings spread across multiple pages. Watch out that Figure 2 is the bottom view of the module and Figure 4 is the top view of what you need for your footprint (i.e. they are mirror image to each other in addition to the obvious rotation). For the gasket you can either try and draw a 1mm line to match the gasket, or just expose the entire module area. You really don’t need any electrical insulation inside, but just the 1mm line will look more professional (like the 3D view in Figure 3).
For this module, I would spend all my time making sure all the dimensions are correct in a single footprint that includes the connector, index and mouting holes, and lines drawn on the soldermask layer for the RF gasket. (Remember the soldermask layer is drawn in negative. Every feature that you draw on the soldermask layer will be holes in the soldermask applied to the board.) Once your footprint is right, it will be more difficult to make a mistake and change the geometry. Are you able to find somewhere a DXF of the contact area for the RF gasket somewhere that you can pull into your footprint on the soldermask layer?
Something I just realized, but maybe I missed it. I don’t see any indication of where pin1 of the connector is relative to the module… Never-mind… I just found it on Figure 6 on page 17. Crisis averted.
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