LTE-A Module Series
EM160R-GL_Hardware_Design 34 / 73
The following figure shows a reference design for (U)SIM interface with a normally open (U)SIM card
connector.
Module
(U)SIM Card
Connector
USIM_DET
USIM_DATA
USIM_CLK
RST
CLK
CD1
IO
USIM_VDD
USIM_RST
VCC
GND
VPP
GND
TVS array
20K
22R
22R
22R
3
3
p
F
3
3
p
F
3
3
p
F
100 nF
0R
CD2
NOTE
: All these resistors, capacitors and TVS array should be close to (U)SIM card connector in PCB layout.
The external pull-up resistor of USIM_DATA is optional.
USIM_VDD
10 k
Ω
Figure 13: Reference Circuit of Normally Open (U)SIM Card Connector
3.6.4. (U)SIM Card Connector Without Hot-Plug
If (U)SIM card hot-plug is not needed, please keep USIM_DET unconnected. A reference circuit for
(U)SIM card interface with a 6-pin (U)SIM card connector is illustrated by the following figure.
Module
(U)SIM Card
Connector
USIM_DET
USIM_DATA
USIM_CLK
RST
CLK
IO
USIM_VDD
USIM_RST
VCC
GND
VPP
GND
TVS array
NOTE
: All these resistors, capacitors and TVS array should be close to (U)SIM card connector in PCB layout.
The external pull-up resistor of USIM_DATA is optional.
20K
22R
22R
22R
3
3
p
F
3
3
p
F
3
3
p
F
100 nF
USIM_VDD
10 k
Ω
Figure 14: Reference Circuit of a 6-Pin (U)SIM Card Connector
1. If the (U)SIM card detection function is not needed, please keep USIM_DET unconnected.
2. If the (U)SIM card detection function is required, note that a pull-up resistor should not be added to
the USIM1_DET and USIM2_DET signals.
NOTE