Specifications

Wireless CPU
®
Q24 Series
Interfaces
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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q24NG_PTS_001-004
January 16, 2007
Pin description
Signal Pin number I/O I/O type Description
VCC_RTC 56 I/O Supply RTC Back-up supply
Operating conditions
Parameter Condition Min Typ Max Unit
Input voltage 2 2.75 V
Input current
VCC_RTC=2.5 V
VDD=3.6V
3 10 μA
Output voltage VDD=3.6V, Iout=0.5mA 2.65 2.7 2.75 V
Output current VDD=3.6, Vout=2.25V 0.4 1 2 mA
3.21 RF Interface
The impedance is 50Ω nominal and the DC impedance is 0Ω.
3.21.1 RF Connections
The RF interface supports 4 types of connections:
• U.FL Connector (on both sides)
A wide variety of cables fitted with U.FL connectors are proposed by different
suppliers.
• MMS Connector
The MMS connector stands on three pliable legs. The design guarantees the
receptacle stability after placement. The MMS snap on mating system ensures a
correct positive connection on each time.
A wide variety of cables fitted with MMS connectors are proposed by different
suppliers.
• Soldered solution
A soldered solution is preferably based on an RG178 coaxial cable.
• IMP connector
This connector is dedicated to different board applications and must be soldered
to the customer board. The supplier is Radiall with the following reference:
R107 064 900 or R107 064 920.
Notes:
• The Wireless CPU
®
Q24 Series does not support an antenna switch for a car kit,
but this function may be implemented externally and it may be driven using a
GPIO.
• The antenna cable and connector should be selected in order to minimize losses
in the frequency bands used for GSM 850/900MHz and 1800/1900MHz.