Service Guide

LTE Standard Module Series
EG915U_Series_Hardware_Design 43 / 81
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
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.
Pin Name
Pin No.
I/O
Description
Comment
USIM1_VDD
43
PO
(U)SIM1 card power supply
Either 1.8 V or 3.0 V (U)SIM card
is supported and can be identified
automatically by the module.
USIM1_DATA
45
DIO
(U)SIM1 card data
USIM1_CLK
46
DO
(U)SIM1 card clock
USIM1_RST
44
DO
(U)SIM1 card reset
USIM1_DET
42
DI
(U)SIM1 card hot-plug detect
1.8 V power domain. If unused,
keep this pin open
USIM1_GND
47
Specified ground for (U)SIM1 card
USIM2_VDD
87
PO
(U)SIM2 card power supply
Either 1.8 V or 3.0 V (U)SIM card
is supported and can be identified
automatically by the module.
USIM2_DATA
86
IO
(U)SIM2 card data
USIM2_CLK
84
DO
(U)SIM2 card clock
USIM2_RST
85
DO
(U)SIM2 card reset
USIM2_DET
83
DI
(U)SIM2 card hot-plug detect
1.8 V power domain. If unused,
keep it open