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RM-272; RM-273
System module
SIM
The SIM interface is the electrical interface between the SIM card and the mobile phone engine.
The data communication between the SIM card and the phone is asynchronous half duplex.
Figure 32 SIM interface connections
SIM Logic level shifting
The SIM interface can support 3V and 1.8V SIM cards.
SIM Power up/down
The SIM power up/down sequence is generated in Retu. This means that Retu generates the reset switch
(RST) signal to the SIM. In addition, the SIMCardDet signal is connected to Retu.
The SIM interface is powered up when the SIMCardDet signal indicates "card in".
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