
xE922-3GR Hardware User Guide
1VV0301272
Rev.0.8 2017-01-05
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Page 75 of 112
A typical diagram for SDMMC card connection is shown in below figure.
Series resistor R1 place holder is recommended for tuning high speed CLK signal, typ.27 Ohm.
Internal regulator VDD_SD supports dual voltage level 2.9V (default)/1.8V, with current rating max 255 mA.
Maximum decoupling capacitance C1 is up to 5 uF (including the internal 1uF decoupling already present).
In case ESD protection to be applied, use high speed device < 2pF.
Routing guide lines for the display SDMMC/SDIO interface:
The next figure shows a typical signal traject with different sub trajects.