LEXI-R422 - System integration manual
UBX-23007449 - R02
Design-in
Page 65 of 108
C1-Public
2.5
SIM interface
2.5.1
Guidelines for SIM circuit design
2.5.1.1
Guidelines for SIM cards, SIM connectors and SIM chips selection
The ISO/IEC 7816, the ETSI TS 102 221 and the ETSI TS 102 671 specifications define the physical,
electrical and functional characteristics of Universal Integrated Circuit Cards (UICC), which contains
the Subscriber Identification Module (SIM) integrated circuit that securely stores all the information
needed to identify and authenticate subscribers over the LTE network.
Removable UICC / SIM card contacts mapping is defined by ISO/IEC 7816 and ETSI TS 102 221 as
follows:
•
Contact C1 = VCC (Supply)
→
It must be connected to
VSIM
•
Contact C2 = RST (Reset)
→
It must be connected to
SIM_RST
•
Contact C3 = CLK (Clock)
→
It must be connected to
SIM_CLK
•
Contact C4 = AUX1 (Auxiliary contact)
→
It must be left not connected
•
Contact C5 = GND (Ground)
→
It must be connected to
GND
•
Contact C6 = VPP/SWP (Other function)
→
It can be left not connected
•
Contact C7 = I/O (Data input/output)
→
It must be connected to
SIM_IO
•
Contact C8 = AUX2 (Auxiliary contact)
→
It must be left not connected
A removable SIM card can have 6 contacts (C1, C2, C3, C5, C6, C7) or 8 contacts, also including the
auxiliary contacts C4 and C8. Only 6 contacts are required and must be connected to the module SIM
interface.
Removable SIM cards are suitable for applications requiring a change of SIM card during the product
lifetime.
A SIM card holder can have 6 or 8 positions if a mechanical card presence detector is not provided, or
it can have 6+2 or 8+2 positions if two additional pins relative to the normally-open mechanical switch
integrated in the SIM connector for the mechanical card presence detection are provided. Select a SIM
connector providing 6+2 or 8+2 positions if the optional SIM detection feature is required by the
custom application, otherwise a connector without integrated mechanical presence switch can be
selected.
Surface-Mounted UICC / SIM chip contact mapping (M2M UICC Form Factor) is defined by the ETSI
TS 102 671 as:
•
Case pin 8 = UICC contact C1 = VCC (Supply)
→
It must be connected to
VSIM
•
Case pin 7 = UICC contact C2 = RST (Reset)
→
It must be connected to
SIM_RST
•
Case pin 6 = UICC contact C3 = CLK (Clock)
→
It must be connected to
SIM_CLK
•
Case pin 5 = UICC contact C4 = AUX1 (Aux.contact)
→
It must be left not connected
•
Case pin 1 = UICC contact C5 = GND (Ground)
→
It must be connected to
GND
•
Case pin 2 = UICC contact C6 = VPP/SWP (Other)
→
It can be left not connected
•
Case pin 3 = UICC contact C7 = I/O (Data I/O)
→
It must be connected to
SIM_IO
•
Case pin 4 = UICC contact C8 = AUX2 (Aux. contact)
→
It must be left not connected
A Surface-Mounted SIM chip has 8 contacts and can also include the auxiliary contacts C4 and C8 for
other uses, but only 6 contacts are required and must be connected to the module SIM card interface
as described above.
Surface-Mounted SIM chips are suitable for M2M applications where it is not required to change the
SIM once installed.
