Quectel RG255C-GL - Application Interfaces; (U)SIM Interface

5G Module Series
RG255C-GL_Mini_PCIe_Hardware_Design 22 / 57
4 Application Interfaces
The physical connections and signal levels of RG255C-GL Mini PCIe comply with PCI Express Mini Card
Electromechanical Specification. This chapter mainly describes the definition and application of the
following interfaces and pins of RG255C-GL Mini PCIe:
⚫ (U)SIM interface
⚫ USB interface
⚫ UART
⚫ PCM* and I2C interfaces
⚫ Control and indication signals
4.1. (U)SIM Interface
The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Either 1.8 V or 3.0 V (U)SIM card
is supported. The following table shows the pin definition of (U)SIM interface.
Table 8: Pin Definition of (U)SIM Interface
RG255C-GL Mini PCIe supports (U)SIM card hot-plug via the USIM_DET pin. The function supports
low-level and high-level detections. Disabled by default, it can be configured via AT+QSIMDET. See
document [3] for details about the command.
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
USIM_VDD
8
PO
(U)SIM card power supply
1.8/3.0 V power domain.
USIM_DATA
10
DIO
(U)SIM card data
1.8/3.0 V power domain.
USIM_CLK
12
DO
(U)SIM card clock
1.8/3.0 V power domain.
USIM_RST
14
DO
(U)SIM card reset
1.8/3.0 V power domain.
USIM_DET
44
DI
(U)SIM card hot-plug detect
1.8 V power domain.