MeiG_SLM550_Hardware Design Manual
MeiG Smart Technology Co., Ltd
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Figure 34 Charging circuit connection diagram
4.11 UIM Card Interface
The SLM550 can support two SIM cards at the same time to achieve dual card dual standby. Support
SIM card hot swap, can automatically recognize 1.8V and 3.0V cards. The figure below is the SIM
recommended interface circuit. In order to protect the SIM card, it is recommended to use TVS devices
for electrostatic protection. The device of the peripheral circuit of the SIM card should be close to the
SIM card holder.
The reference circuit is as follows:
Figure 35 UIM card interface circuit
PM4125
Module
SIM card
