Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 Design-in Page 68 of 119
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 (Programming supply)  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.
Solderable UICC / SIM chip contact mapping (M2M UICC Form Factor) is defined by 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 (Progr. supply)  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 solderable 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.
Solderable SIM chips are suitable for M2M applications where it is not required to change the SIM once installed.
2.5.1.2 Guidelines for single SIM card connection without detection
A removable SIM card placed in a SIM card holder must be connected to the SIM card interface of SARA-R4/N4 series
modules as described in Figure 37, where the optional SIM detection feature is not implemented.
Follow these guidelines to connect the module to a SIM connector without SIM presence detection:
• Connect the UICC / SIM contacts C1 (VCC) to the VSIM pin of the module.
• Connect the UICC / SIM contact C7 (I/O) to the SIM_IO pin of the module.
• Connect the UICC / SIM contact C3 (CLK) to the SIM_CLK pin of the module.
• Connect the UICC / SIM contact C2 (RST) to the SIM_RST pin of the module.