LISA-U2 series - System integration manual
UBX-13001118 - R27
System description
Page 48 of 183
C1-Public
1.8.1.2
Single SIM card without detection
A removable SIM card placed in a SIM card holder must be connected to the SIM card interface of
LISA-U2 modules as described in
, where the optional SIM detection feature is not
implemented (see the circuit described in
if the SIM detection feature is required).
Follow these guidelines connecting the module to a SIM connector without the 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 corresponding pad of the SIM connector, to prevent digital noise
•
Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H330J) on each SIM
line (
VSIM
,
SIM_CLK
,
SIM_IO
,
SIM_RST
), very close to each specific 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 Electronics
PESD0402-140) on each externally accessible SIM line, close to each specific pad of the SIM
connector: the ESD sensitivity rating of the SIM interface pins is 1 kV (Human Body Model
according to JESD22-A114), so that, according to the EMC/ESD requirements of the custom
application, higher protection levels can be required if the lines are externally accessible on the
application device
•
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)
LISA-U2 series
50
VSIM
48
SIM_IO
47
SIM_CLK
49
SIM_RST
4
V_INT
51
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
Figure 21: 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
33 pF Capacitor Ceramic COG 0402 5% 25 V
GRM1555C1H330JZ01 - 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 22: Example of components for the connection to a single removable SIM card, with SIM detection not implemented