WM_PRJ_Q2400_PTS_005 -00718th January 2006Confidential©All rights reservedPage: 42 / 51This document is the sole and exclusive property of WAVECOM. Not to bedistributed or divulged without prior written agreement.5 PCB design5.1 General design rulesClocks 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 beseparated 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 manufacturingThe WISMO Quik Q24x6 sub-series does not support any reflow soldering.5.3 Recommendation for lead free solderingIn order to maintain the RoHS status of the module, Wavecom recommend, forthe assembly of the module on the mother board and the assembly of RF cableon the Module to uselead 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 supplyRefer to § 2.1.3.
