u-blox LEXI-R422, Руководство по системной интеграции

Страница: 67 / 108

LEXI-R422 - System integration manual
UBX-23007449 - R02 Design-in Page 67 of 108
C1-Public
2.5.1.3 Guidelines for single SIM chip connection
A Surface-Mounted SIM chip (M2M UICC Form Factor) must be connected the SIM card interface of
the LEXI-R422 modules as described in
Figure 44 .
Follow these guidelines to connect the module to a Surface-Mounted SIM chip 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 close
to the relative pad of the SIM chip, to prevent digital noise.
• Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM
line, to prevent RF coupling especially in case the RF antenna is placed closer than 10 - 30 cm from
the SIM lines.
• Limit capacitance and series resistance on each SIM signal to match the SIM requirements (50 ns
is the maximum allowed rise time on clock line, 1.0 µs is the maximum allowed rise time on data
and reset lines).
SIM CHIP
SIM chip
bottom view
(contacts side)
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
C2 C3 C5 C4
2
8
3
6
7
1
C1 C5
C2 C6
C3 C7
C4 C8
8
7
6
5 1
2
3
4
LEXI-R422
C1
U1
H15
VSIM
J15
SIM_IO
K15
SIM_CLK
L15
SIM_RST
Figure 44: Application circuits for the connection to a single Surface-Mounted SIM chip
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
U1 SIM chip (M2M UICC form factor) Generic manufacturer
Table 28: Example of components for the connection to a single solderable SIM chip
2.5.1.4 Guidelines for single SIM card connection with detection
An application circuit for the connection to a single removable SIM card placed in a SIM card holder is
described in
Figure 45 , where the optional SIM card detection feature is implemented.
Follow these guidelines connecting the module to a SIM connector implementing 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.