LARA-R2 series - System Integration Manual
UBX-16010573 - R02
Objective Specification
Design-in
Page 95 of 148
Guidelines for single SIM card connection without detection
A removable SIM card placed in a SIM card holder has to be connected to the SIM card interface of LARA-R2
series modules as described in Figure 44, where the optional SIM detection feature is not implemented.
Follow these guidelines connecting 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) at the SIM supply line (
VSIM
), close to
the related 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
(
VSIM
,
SIM_CLK
,
SIM_IO
,
SIM_RST
), 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 low capacitance (i.e. less than 10 pF) ESD protection (e.g. Tyco Electronics PESD0402-140) on each
externally accessible SIM line, close to each related pad of the SIM connector: ESD sensitivity rating of the
SIM interface pins is 1 kV (HBM), so that, according to the 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 signal of the SIM interface (
SIM_CLK
,
SIM_IO
,
SIM_RST
), to
match the SIM interface specifications requirements (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).
LARA-R2 series
41
VSIM
39
SIM_IO
38
SIM_CLK
40
SIM_RST
4
V_INT
42
GPIO5
SIM CARD
HOLDER
C
5
C
6
C
7
C
1
C
2
C
3
SIM Card
Bottom View
(contacts side)
C1
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
C2 C3
C5
J1
C4
D1 D2 D3 D4
C
8
C
4
TP
Figure 44: Application circuit 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 positions, without card presence switch
Various Manufacturers,
C707 10M006 136 2 - Amphenol
Table 35: Example of components for the connection to a single removable SIM card, with SIM detection not implemented
