U)Sim Interface - Quectel EG25-G Hardware Design

LDO_IN
D1
C1
470 μF 100 nF
TVS
MCU_POWER
_ON/OFF

3.4. (U)SIM Interface

The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8 V and 3.0V (U)SIM cards
are supported. The following table shows the pin definition of (U)SIM interface.
Table 7: Pin Definition of (U)SIM Interface
Pin Name
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
USIM_PRESENCE
EG25-G Mini PCIe supports (U)SIM card hot-plug via the USIM_PRESENCE pin. The function supports
low level and high level detections. By default, It is disabled, and can be configured via AT+QSIMDET
command. Please refer to document [2] for details about the command.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
EG25-G_Mini_PCIe_Hardware_Design
MIC29302WU
2
IN
R1
C2
51K
R5
4.7K
R6
47K
Figure 3: Reference Circuit of Power Supply
Pin No. I/O
8 PO
10 IO
12 DO
14 DO
44 DI
EG25-G Mini PCIe Hardware Design
U1
4
OUT
R2
82K 1%
R4
470R
R3
47K 1%
Power Domain Description
1.8/3.0 V Power supply for (U)SIM card
1.8/3.0 V Data signal of (U)SIM card
1.8/3.0 V Clock signal of (U)SIM card
1.8/3.0 V Reset signal of (U)SIM card
1.8 V (U)SIM card insertion detection
LTE Standard Module Series
VCC_3V3
C3
C4 C5 C6
470 μF 100 nF 33 pF
10 pF
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