WM_PRJ_Q2400_PTS_005 -007
18th January 2006
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5 PCB design
5.1 General design rules
Clocks and other high frequency digital signals (e.g parallel and serial buses)
should be routed as far as possible from the WISMO analog signals.
If the application design makes it possible, all analog signals should be
separated from digital signals by a ground line on the PCB.
It is recommended to protect clock signals with a ground belt.
Refer to the following sections for other constraints:
2.1.3 for the Power Supply,
2.2.6.4 for the SIM interface,
2.3.2.4 for the audio interface.
5.2 Design rules for application manufacturing
The WISMO Quik Q24x6 sub-series does not support any reflow soldering.
5.3
Recommendation for lead free soldering
In order to maintain the RoHS status of the module, Wavecom recommend, for
the assembly of the module on the mother board and the assembly of RF cable
on the Module to use
lead free solder wire and flux.
For example:
o
Solder Wire : Kester 245 Cored 58 (Sn96.5Ag3Cu0.5)
o
Flux : Kester 952-D6.
5.4 Power supply
Refer to § 2.1.3.
