User's Manual

page 43/64
Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
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6.5 Recommendations to avoid ESD issues
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Insure good ground connections of the HiLoNC V2 module to the customer’s board.
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Flex (if any) shall be shielded and FPC connectors shall be correctly grounded at each extremity.
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Put capacitor 100nF on battery, or better put varistor or ESD diode in parallel on battery and charger wires
(if any) and on all power wires connected to the module.
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Uncouple microphone and speaker by putting capacitor or varistor in parallel of each wire of these
devices.
7. RADIO INTEGRATION
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Note that radio engineering competences are mandatory to get accurate radio performance on customer’s
product.
7.1 ANTENNA
A 50Ω line matching between module and customer’s board, and the RF antenna is required.
Figure 43: Antenna connection
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Keep matching circuit on customer’s board but with direct connection in the first step – it could be
necessary to make some adjustment later, during RF qualification stage.
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The selected antenna must comply with FCC RF exposure limits in GSM850 and PCS1900 band :
• GSM850 : MPE < 0.55mW/cm
2
(Distance is 20 cm)
• PCS1900 : ERP < 3W