Hardware Interface Description - Wireless Data Modules

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MC55/56 Hardware Interface Description Confidential / Released s Table 19: MC55/56 ring signal Function Pin Status Description Ring indication /RING0 0 Indicates an incoming call or URC. If in NON-CYCLIC SLEEP mode CFUN=0 or CYCLIC SLEEP mode CFUN=5 or 6, the module is caused to wake up to full functionality. If CFUN=7 or 8, power saving is resumed after URC transmission or end of call. 1 No operation MC55/56_hd_v02.06 Page 66 of 105 29.10.2004
MC55/56 Hardware Interface Description Confidential / Released s 4 Antenna interface The RF interface has an impedance of 50Ω. MC55/56 is capable of sustaining a total mismatch at the antenna connector or pad without any damage, even when transmitting at maximum RF power. The external antenna must be matched properly to achieve best performance regarding radiated power, DC-power consumption and harmonic suppression. Matching networks are not included on the MC55/56 PCB and should be placed in the host application. Regarding the return loss MC55/56 provides the following values: Table 20: Return loss State of module Return loss of module Recommended return loss of application Receive > 8dB > 12dB Transmit not applicable > 12dB Idle < 5dB not applicable The connection of the antenna or other equipment must be decoupled from DC voltage. 4.1 Antenna installation To suit the physical design of individual applications MC55/56 offers two alternative approaches to connecting the antenna: • Recommended approach: U.FL-R-SMT antenna connector from Hirose assembled on the component side of the PCB (top view on MC55/56). See Chapter 4.1.2 for details. • Antenna pad and grounding plane placed on the bottom side. See Chapter 4.1.1. Antenna ground Antenna pad Figure 27: U.FL-R-SMT connector Figure 28: Antenna pad and GND plane MC55/56_hd_v02.06 Page 67 of 105 29.10.2004
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