Wavecom WISMO Quik Q2406 Customer Design Manuallines
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WM_PRJ_Q2400_PTS_005 -00718th January 2006Confidential©All rights reservedPage: 16 / 51This document is the sole and exclusive property of WAVECOM. Not to bedistributed or divulged without prior written agreement.2.1.3.3 Decoupling of power supply signalsDecoupling capacitors on VBATT and VDD lines are imbedded in the module. Soit should not be necessary to add decoupling capacitors close to the module.However, in case of EMI/RFI problem, some signals like VBATT and charge line(CHG_IN) may require some EMI/RFI decoupling: parallel 33 pF capacitor close tothe module or a serial ferrite bead (or both to get better results).In case a ferrite bead is used, the recommendation given for the power supplyconnection must be carefully followed (high current capacity and lowimpedance).2.2 Digital I/O and peripheral implementation2.2.1 Electrical information for digital I/OAll digital I/O comply with 3Volts CMOS.To interface the WISMO Quik Q24x6 sub-series digital signals with other logics:• 3.3 V logic: some serial resistors (more than 11kΩ) can be added on thelines,• For higher voltage logics, a resistor bridge or a level shifter IC can beadded.2.2.2 LCD interfaceThe WISMO Quik Q24x6 sub-series can be connected to a LCD module driverthrough either a SPI bus or a two-wire interface.2.2.2.1 SPI busThe SPI bus includes a CLK signal (SPI_CLK), an I/O signal (SPI_IO) and an ENsignal (SPI_EN) complying with SPI bus standard. |
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