Ublox TOBY-R2 Series System Integration Manual

Also see for TOBY-R2 Series: User guide

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Ublox TOBY-R2 Series System Integration Manual Manual pdf 99 page image

TOBY-R2 series - System integration manualUBX-16010572 - R10 Design-in Page 99 of 151TOBY-R2 seriesC1FIRSTSIM CARDVPP (C6)VCC (C1)IO (C7)CLK (C3)RST (C2)GND (C5)C2 C3 C5J1C4 D1 D2 D3 D4GNDU159VSIM VSIM 1VSIM2VSIMVCCC114PDTAnalogSwitch3V857SIM_IO DAT 1DAT2DAT56SIM_CLK CLK 1CLK2CLK58SIM_RST RST 1RST2RSTSELSECONDSIM CARDVPP (C6)VCC (C1)IO (C7)CLK (C3)RST (C2)GND (C5)J2C6 C7 C8 C10C9 D5 D6 D7 D8ApplicationProcessorGPIOR1Figure 49: Application circuit for the connection to two removable SIM cards, with SIM detection not implementedReference Description Part Number - ManufacturerC1 – C4, C6 – C9 33 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1H330JZ01 – MurataC5, C10, C11 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 – MurataD1 – D8 Very Low Capacitance ESD Protection PESD0402-140 - Tyco ElectronicsR1 47 k Resistor 0402 5% 0.1 W RC0402JR-0747KL- Yageo PhycompJ1, J2 SIM Card Holder, 6 + 2 p., with card presence switch CCM03-3013LFT R102 - C&K ComponentsU1 4PDT Analog Switch,with Low On-Capacitance and Low On-ResistanceFSA2567 - Fairchild SemiconductorTable 39: Example of components for the connection to two removable SIM cards, with SIM detection not implemented2.5.2 Guidelines for SIM layout designThe layout of the SIM card interface lines (VSIM, SIM_CLK, SIM_IO, SIM_RST may be critical if theSIM card is placed far away from the TOBY-R2 series modules or in close proximity to the RF antenna:these two cases should be avoided or at least mitigated as described below.In the first case, the long connection can cause the radiation of some harmonics of the digital datafrequency as any other digital interface. It is recommended to keep the traces short and avoidcoupling with RF line or sensitive analog inputs.In the second case, the same harmonics can be picked up and create self-interference that can reducethe sensitivity of LTE/3G/2G receiver channels whose carrier frequency is coincidental with harmonicfrequencies. It is strongly recommended to place the RF bypass capacitors suggested in Figure 46near the SIM connector.In addition, since the SIM card is typically accessed by the end user, it can be subjected to ESDdischarges. Add adequate ESD protection as suggested to protect module SIM pins near the SIMconnector.Limit capacitance and series resistance on each SIM signal to match the SIM specifications. Theconnections should always be kept as short as possible.Avoid coupling with any sensitive analog circuit, since the SIM signals can cause the radiation of someharmonics of the digital data frequency.