TOBY-L4 series - System Integration Manual
UBX-16024839 - R04
Design-in
Page 79 of 143
2.5
SIM interfaces
2.5.1
Guidelines for SIM circuit design
Guidelines for SIM cards, SIM connectors and SIM chips selection
TOBY-L4 series modules provide two SIM interfaces for the direct connection of two external SIM cards/chips,
which can be used alternatively (only one SIM at a time can be used for network access):
SIM0 interface (
VSIM
,
SIM_IO
,
SIM_CLK
,
SIM_RST
pins), enabled by default
SIM1 interface (
VSIM1
,
SIM1_IO
,
SIM1_CLK
,
SIM1_RST
pins), alternatively enabled
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/3G/2G network.
Removable UICC / SIM card contact mapping is defined by ISO/IEC 7816 and ETSI TS 102 221 as follows:
Contact C1 = VCC (Supply)
It must be connected to
VSIM
/
VSIM1
Contact C2 = RST (Reset)
It must be connected to
SIM_RST
/
SIM1_RST
Contact C3 = CLK (Clock)
It must be connected to
SIM_CLK
/
SIM1_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
/
SIM1_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’s 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 an 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
/
VSIM1
Case Pin 7 = UICC Contact C2 = RST (Reset)
It must be connected to
SIM_RST
/
SIM1_RST
Case Pin 6 = UICC Contact C3 = CLK (Clock)
It must be connected to
SIM_CLK
/
SIM1_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
/
SIM1_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.
