SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11
Design-in
Page 93 of 157
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
, 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.
Connect the UICC / SIM contact C5 (GND) to ground.
Provide a 100 nF bypass capacitor (e.g. Murata GRM155R71C104K) on SIM supply line, close to the
relative pad of the SIM connector, to prevent digital noise.
Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM line,
very close to each related pad of the SIM connector, to prevent RF coupling especially in case the RF
antenna is placed closer than 10 - 30 cm from the SIM card holder.
Provide a very low capacitance (i.e. less than 10 pF) ESD protection (e.g. Tyco PESD0402-140) on each
externally accessible SIM line, close to each relative pad of the SIM connector. ESD sensitivity rating of
the SIM interface pins is 1 kV (HBM). So that, according to EMC/ESD requirements of the custom
application, higher protection level can be required if the lines are externally accessible on the
application device.
Limit capacitance and series resistance on each SIM signal to match the SIM requirements (18.7 ns is
the maximum allowed rise time on clock line, 1.0
µ
s is the maximum allowed rise time on data and
reset lines).
