LISA-U series - System Integration Manual
UBX-13001118 - R17
Advance information
System description
Page 51 of 190
1.8.1.3
Single SIM chip
A solderable SIM chip (M2M UICC Form Factor) must be connected the SIM card interface of LISA-U modules as
described in Figure 23, where the optional SIM detection feature is not implemented (see the circuit described in
Figure 24 if the SIM detection feature is required).
Follow these guidelines connecting the module to a solderable SIM chip without the SIM presence detection:
Connect the UICC / SIM contacts C1 (VCC) and C6 (VPP) 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 specific pad of the SIM chip, 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
), to prevent RF coupling especially in case the RF antenna is placed
closer than 10 - 30 cm from the SIM card holder
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-U series
50
VSIM
48
SIM_IO
47
SIM_CLK
49
SIM_RST
4
V_INT
51
GPIO5
SIM CHIP
SIM Chip
Bottom View
(contacts side)
C1
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
C2 C3
C5
U1
C4
2
8
3
6
7
1
C1
C5
C2
C6
C3
C7
C4
C8
8
7
6
5
1
2
3
4
Figure 23: Application circuit for the connection to a single solderable SIM chip, 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
U1
SIM chip (M2M UICC Form Factor)
Various Manufacturers
Table 24: Example of components for the connection to a single solderable SIM chip, with SIM detection not implemented
1.8.1.4
Single SIM card with detection
A removable SIM card placed in a SIM card holder must be connected to the SIM card interface of LISA-U
modules as described in Figure 24, where the optional SIM card detection feature is implemented so that the
module detects by means of the
GPIO5
if a SIM card is present in the connector. The SW1 and SW2 pins of the
SIM card holder are connected to a normally-open mechanical switch integrated in the SIM connector. The
following cases are available:
SIM card not present: the
GPIO5
signal is forced low by the pull-down resistor connected to ground (i.e. the
switch integrated in the SIM connector is open)
SIM card present: the
GPIO5
signal is forced high by the pull-up resistor connected to
V_INT
(i.e. the switch
integrated in the SIM connector is closed)
