LENA-R8 series - System integration manual
UBX-22015376 - R02
Design-in
Page 69 of 116
C1-Public
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
LENA-R8 series modules as described in
, 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 when 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. Littelfuse PESD0402-140) on
each externally accessible SIM line, close to each related pad of the SIM connector: the ESD
sensitivity rating of the SIM interface pins is 1 kV (HBM), so that, according to the EMC/ESD
requirements of the custom application, a higher protection level can be required if the lines are
externally accessible on the application device.
•
Limit the capacitance and series resistance on each signal of the SIM interface (
SIM_CLK
,
SIM_IO
,
SIM_RST
) to match the SIM interface specifications requirements for the max allowed rise time.
LENA-R8 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 45: 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 - Littelfuse
J1
SIM Card Holder
6 positions, without card presence switch
Various Manufacturers, as
C707 10M006 136 2 - Amphenol
Table 33: Example of components for the connection to a single removable SIM card, with SIM detection not implemented
