Specifications

Cinterion
®
PLSx3 Hardware Interface Description
2.1 Application Interface
66
t PLSx3_HID_v01.002d 2021-08-24
Public / Released
Page 37 of 129
2.1.6.2 SIM_SWITCH Line
As an alternative to connecting the module’s two SIM interfaces and switching between these
interfaces by means of AT command, it is possible to connect the first of the module’s SIM in-
terfaces via an external SIM switch that in turn provides access to a further SIM interface.
Figure 12: External UICC/SIM/USIM switch
The module’s GPIO26 line can in this case be configured as SIM_SWITCH line in order to con-
trol the external SIM switch as shown in the sample circuit in Figure 13. A low state would then
indicate the usage of the first SIM interface (SIM1A), a high state would indicate the usage of
the second interface (SIM1B).
The configuration of the SIM_SWITCH (GPIO26) line is done via AT command, is non-volatile,
and available after the next module restart.
Figure 13: Sample circuit for SIM interface connection via SIM switch
SIM1A
Switch
GPIO26/
SIM_SWITCH
SIM1B
Module
1
st
SIM interface
ESD
protection
SIM1A
SIM1B
Sim Switch
VSIM1
CCCLK1
CCIO1
CCRST1
SIM_
SWITCH
CCIN1
IF1
COMMON
SIMSELECT
VBAT
External Application
Module
ESD
protection
IF2
100k
22k
10k
FSA2567