U)Sim Interface - Quectel EG915U Series Hardware Design

4.4. (U)SIM Interface

The module provides 2 (U)SIM interfaces, dual SIM single stand by. The (U)SIM interfaces circuitry meets
ETSI requirement. Both 1.8 V and 3.0 V (U)SIM cards are supported.
Table 15: Pin Definition of (U)SIM Interfaces
Pin Name Pin No.
USIM1_VDD 43
USIM1_DATA 45
USIM1_CLK 46
USIM1_RST 44
USIM1_DET 42
USIM1_GND 47
USIM2_VDD 87
USIM2_DATA 86
USIM2_CLK 84
USIM2_RST 85
USIM2_DET 83
EG915U series module supports (U)SIM card hot-plug via the USIM_DET pin and both high and low level
detections are supported. By default, the function is disabled, please see AT+QSIMDET in document [2]
for more details.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
EG915U_Series_Hardware_Design
I/O Description
PO (U)SIM1 card power supply
DIO (U)SIM1 card data
DO (U)SIM1 card clock
DO (U)SIM1 card reset
DI (U)SIM1 card hot-plug detect
PO (U)SIM2 card power supply
IO (U)SIM2 card data
DO (U)SIM2 card clock
DO (U)SIM2 card reset
DI (U)SIM2 card hot-plug detect
LTE Standard Module Series
Comment
Either 1.8 V or 3.0 V (U)SIM card
is supported and can be identified
automatically by the module.
1.8 V power domain. If unused,
keep this pin open
Specified ground for (U)SIM1 card
Either 1.8 V or 3.0 V (U)SIM card
is supported and can be identified
automatically by the module.
1.8 V power domain. If unused,
keep it open
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