![Ublox TOBY-L2 series System Integration Manual Download Page 101](http://html1.mh-extra.com/html/ublox/toby-l2-series/toby-l2-series_system-integration-manual_3394985101.webp)
TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
Design-in
Page 101 of 164
Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM
line, very close to each related pad of the two SIM connectors, to prevent RF coupling especially in
case the RF antenna is placed closer than 10 – 30 cm from the SIM card holders.
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 pad of the two SIM
connectors, according to the EMC/ESD requirements of the custom application.
Limit capacitance and series resistance on each SIM signal to match the SIM requirements
(26.2 ns is the maximum allowed rise time on clock line, 1.0
µ
s is the maximum allowed rise time on
data and reset lines).
TOBY-L2 series
C1
FIRST
SIM CARD
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
C2 C3
C5
J1
C4
D1 D2 D3 D4
GND
U1
59
VSIM
VSIM
1VSIM
2VSIM
VCC
C11
4PDT
Analog
Switch
3V8
57
SIM_IO
DAT
1DAT
2DAT
56
SIM_CL
K
CLK
1CLK
2CLK
58
SIM_RS
T
RST
1RST
2RST
SEL
SECOND
SIM CARD
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
J2
C6 C7 C8
C10
C9
D5 D6 D7 D8
Application
Processor
GPIO
R1
MPCI-L2 series
C1
FIRST
SIM CARD
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
C2 C3
C5
J1
C4
D1 D2 D3 D4
GND
U1
8
UIM_PWR
VSIM
1VSIM
2VSIM
VCC
C11
4PDT
Analog
Switch
3V8
10
UIM_DATA
DAT
1DAT
2DAT
12
UIM_CLK
CLK
1CLK
2CLK
14
UIM_RESE
T
RST
1RST
2RST
SEL
SECOND
SIM CARD
VPP (C6)
VCC (C1)
IO (C7)
CLK (C3)
RST (C2)
GND (C5)
J2
C6 C7 C8
C10
C9
D5 D6 D7 D8
Application
Processor
GPIO
R1
Figure 53: Application circuit for the connection to two removable SIM cards, with SIM detection not implemented
Reference
Description
Part Number – Manufacturer
C1 – C4, C6 – C9 33 pF Capacitor Ceramic C0G 0402 5% 25 V
GRM1555C1H330JZ01 – Murata
C5, C10, C11
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C104KA01 – Murata
D1 – D8
Very Low Capacitance ESD Protection
PESD0402-140 – Tyco Electronics
R1
47 k
Resistor 0402 5% 0.1 W
RC0402JR-0747KL- Yageo Phycomp
J1, J2
SIM Card Holder, 6 + 2 p., with card presence switch
CCM03-3013LFT R102 – C&K Components
U1
4PDT Analog Switch,
with Low On-Capacitance and Low On-Resistance
FSA2567 – Fairchild Semiconductor
Table 33: Example of components for the connection to two removable SIM cards, with SIM detection not implemented