LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 42 / 106
Table 9: Pin Definition of (U)SIM Interfaces
Pin Name Pin No. I/O Description Comment
USIM1_VDD 43 PO Power supply for (U)SIM1 card
Either 1.8V or 3.0V is
supported by the module
automatically.
USIM1_DATA 45 IO Data signal of (U)SIM1 card
USIM1_CLK 46 DO Clock signal of (U)SIM1 card
USIM1_RST 44 DO Reset signal of (U)SIM1 card
USIM1_
PRESENCE
42 DI (U)SIM1 card insertion detection
USIM_GND 47 Specified ground for (U)SIM card
USIM2_VDD 87 PO Power supply for (U)SIM2 card
Either 1.8V or 3.0V is
supported by the module
automatically.
USIM2_DATA 86 IO Data signal of (U)SIM2 card
USIM2_CLK 84 DO Clock signal of (U)SIM2 card
USIM2_RST 85 DO Reset signal of (U)SIM2 card
USIM2_
PRESENCE
83 DI (U)SIM2 card insertion detection
EG91 series module supports (U)SIM card hot-plug via USIM_PRESENCE (USIM1_PRESENCE/USIM2
_PRESENCE) pin. The function supports low level and high level detection. By default, it is disabled by
default, and can be configured via AT+QSIMDET command. Please refer to document [2] about the
command.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
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