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SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 Design-in Page 69 of 119
• 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 µs is the maximum allowed rise time on data and reset lines).
SARA-R4/ N4
41
VSIM
39
SIM _IO
38
SIM _CLK
40
SIM _RST
SIM CARD
HOLDER
C
5
C
6
C
7
C
1
C
2
C
3
SIM Card
Bot t om View
(cont act s side)
C1
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
C2 C3 C5
J 1
C4
D1 D2 D3 D4
C
8
C
4
Figure 37: Application circuits for the connection to a single removable SIM card, with SIM detection not implemented
Reference Description Part Number - Manufacturer
C1, C2, C3, C4 47 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H470JA01 - Murata
C5 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 - Murata
D1, D2, D3, D4 Very Low Capacitance ESD Protection PESD0402-140 - Tyco Electronics
J1 SIM Card Holder, 6 p, without card presence switch Various manufacturers, as C707 10M006 136 2 - Amphenol
Table 26: Example of components for the connection to a single removable SIM card, with SIM detection not implemented