u-blox SARA-G3 Series System Integration Manual page 123

 Limit capacitance and series resistance on each SIM signal (SIM_CLK, SIM_IO, SIM_RST) to match
the requirements for the SIM interface (27.7 ns is the maximum allowed rise time on the SIM_CLK
line, 1.0 µs is the maximum allowed rise time on the SIM_IO and SIM_RST lines)
SARA-G3 series
TP
V_INT
4
SIM _DET
42
VSIM 41
SIM _IO 39
SIM _CLK
38
SIM _RST
40
Figure 43: Application circuit for the connection to a single removable SIM card, with SIM detection not implemented
Reference Description
C1, C2, C3, C4 47 pF Capacitor Ceramic C0G 0402 5% 50 V
C5 100 nF Capacitor Ceramic X7R 0402 10% 16 V
D1, D2, D3, D4 Very Low Capacitance ESD Protection
J1 SIM Card Holder
6 positions, without card presence switch
Table 23: Example of components for the connection to a single removable SIM card, with SIM detection not implemented
Guidelines for single SIM chip connection
A solderable SIM chip (M2M UICC Form Factor) must be connected the SIM card interface of SARA-G3
modules as described in Figure 44Figure
(refer to the circuit described in
Follow these guidelines connecting the module to a solderable SIM chip without SIM presence detection:
 Connect the UICC / SIM contacts C1 (VCC) and C6 (VPP) 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) at the SIM supply line (VSIM)
close to the relevant pad of the SIM chip, to prevent digital noise

Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM
line (VSIM, SIM_CLK, SIM_IO, SIM_RST), to prevent RF coupling especially in case the RF
antenna is placed closer than 10 - 30 cm from the SIM card holder

Limit capacitance and series resistance on each SIM signal (SIM_CLK, SIM_IO, SIM_RST) to match
the requirements for the SIM interface (27.7 ns is the maximum allowed rise time on the SIM_CLK
line, 1.0 µs is the maximum allowed rise time on the SIM_IO and SIM_RST lines)
UBX-13000995 - R06
SARA-G3 series - System Integration Manual
C1 C2 C3 C4 C5
D1 D2 D3 D4
Part Number - Manufacturer
GRM1555C1H470JA01 - Murata
GRM155R71C104KA01 - Murata
PESD0402-140 - Tyco Electronics
Various Manufacturers,
C707 10M006 136 2 - Amphenol
44, where the optional SIM detection feature is not implemented
Figure 45Figure 45 if the SIM detection feature is not required).
Objective Specification
SIM CARD
HOLDER
VPP (C6)
VCC (C1) C C C C
5 6 7 8
IO (C7)
C C C C
1 2 3 4
CLK (C3)
RST (C2) SIM Card
Bottom View
GND (C5)
(contacts side)
J1
Design-in
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