HUAWEI TECHNOLOGIES CO., LTD.
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4.10 Troubleshooting SIM Socket Faults
4.10.1 SIM Socket Circuit
MT6253 include a dedicated smart card interface; can make MCU communication with SIM card.
It has five signal interfaces: VSIM, SIM_IO, SIM_RST and SIM_CLK, VSIM be used to provide
voltage for the SIM card, SIM_IO and SIM_CLK be used to data exchange for SIM card. The
figure is the SIM holder of CM301 is 8pin. Specific signals seen in the figure
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