Quectel EG91 Series Hardware Design page 43

Table 9: Pin Definition of (U)SIM Interfaces
Pin Name Pin No.
USIM1_VDD 43
USIM1_DATA 45
USIM1_CLK 46
USIM1_RST 44
USIM1_
42
PRESENCE
USIM_GND 47
USIM2_VDD 87
USIM2_DATA 86
USIM2_CLK 84
USIM2_RST 85
USIM2_
83
PRESENCE
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.
EG91_Series_Hardware_Design
I/O Description
PO Power supply for (U)SIM1 card
IO Data signal of (U)SIM1 card
DO Clock signal of (U)SIM1 card
DO Reset signal of (U)SIM1 card
DI (U)SIM1 card insertion detection
Specified ground for (U)SIM card
PO Power supply for (U)SIM2 card
IO Data signal of (U)SIM2 card
DO Clock signal of (U)SIM2 card
DO Reset signal of (U)SIM2 card
DI (U)SIM2 card insertion detection
LTE Standard Module Series
EG91 Series Hardware Design
Comment
Either 1.8V or 3.0V is
supported by the module
automatically.
Either 1.8V or 3.0V is
supported by the module
automatically.
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