Integration Manual

LISA-U2 series - System Integration Manual
UBX-13001118 - R25 System description Page 48 of 182
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 Figure 21, where the optional SIM detection feature is not
implemented (see the circuit described in Figure 23 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 µ s 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