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USIM1_DET
USIM2_VDD
USIM2_DATA
USIM2_CLK
USIM2_RST
USIM2_DET
The module supports (U)SIM card hot-plug via the USIM_DET pin, and both high level and low level
detection is supported. The function is disabled by default and can be configured via AT+QSIMDET. See
document [3] for more details about the command.
The following figure illustrates a reference design for (U)SIM card interface with an 8-pin (U)SIM card
connector.
USIM_VDD
USIM_RST
Module
USIM_CLK
USIM_DET
USIM_DATA
Figure 20: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector
If (U)SIM card detection function is not needed, keep USIM_DET unconnected. A reference circuit for
(U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following figure.
RG520N-AT_Hardware_Design
249
DI
250
PO
251
DIO
253
DO
254
DO
252
DI
VDD_EXT
USIM_VDD
100K
0R
0R
0R
10 pF 10 pF 10 pF
(U)SIM1 card hot-plug
detect
(U)SIM2 card power
supply
(U)SIM2 card data
(U)SIM2 card clock
(U)SIM2 card reset
(U)SIM2 card hot-plug
detect
20K
GND
GND
5G Module Series
1.8 V power domain.
If unused, keep it open.
Either 1.8 V or 2.95 V is
supported and can be
identified automatically by
the module.
1.8 V power domain.
If unused, keep it open.
(U)SIM Card Connector
VCC
RST
CLK
TVS Array
49 / 109
GND
VPP
IO
GND
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