Nokia RM-164 Service Manual page 149

RM-164
System module
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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