Ublox SARA-G450 Series User Manual

SARA-G450 - System integration manual
UBX-18046432 - R08 Design-in Page 86 of 143
C1-Public
2.5.1.2 Guidelines for single SIM card connection without detection
An application circuit for the connection to a single removable SIM card placed in a SIM card holder is
described in Figure 43, where the optional SIM detection feature is not implemented (see the circuit
described in Figure 45 if the SIM detection feature is required).
Follow these guidelines connecting the module to a SIM connector without SIM presence detection:
 Connect the UICC / SIM contact 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 GND.
 Provide a 1 µF bypass capacitor (e.g. Murata GRM155R70J105K) 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 33 pF (e.g. Murata GRM1555C1H330J) 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 in case the RF antenna is placed closer than 10 – 30 cm from the
SIM card holder.
 Provide a low capacitance (i.e. less than 1 pF) ESD protection (e.g. Tyco Electronics 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 (Human Body Model according to JESD22-A114),
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 capacitance and series resistance on each SIM signal (SIM_CLK, SIM_IO, SIM_RST) to
match the requirements for the SIM interface regarding maximum allowed rise time on the lines.
scaling
SARA-G450
41
VSIM
39
SIM_IO
38
SIM_CLK
40
SIM_RST
4
V_INT
42
SIM_DET
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 43: 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 C0G 0402 5% 50 V
GRM1555C1H330JA01 – Murata
C5
1 µF capacitor ceramic X7R 0402 10% 16 V
GRM155R70J105KA12 – Murata
D1, D2, D3, D4
Very low capacitance ESD protection
PESD0402-140 – Tyco Electronics
J1
SIM card holder
6 positions, without card presence switch
Generic manufacturer,
C707 10M006 136 2 – Amphenol
Table 28: Example of components for the connection to a single removable SIM card, with SIM detection not implemented

Ublox SARA-G450 Series Specifications

General

Brand	Ublox
Model	SARA-G450 Series
Category	GSM/GPRS Modules
Language	English