Quectel RM520N-GL - Application Interfaces; (U)SIM Interface

5G Module Series
RM520N-GL_Hardware_Design 39 / 84
4 Application Interfaces
The physical connections and signal levels of the module comply with the PCI Express M.2 specification.
This chapter mainly describes the definition and application of the following interfaces/pins of the module:
⚫ (U)SIM interfaces
⚫ USB interface
⚫ PCIe interface
⚫ Control and indication interfaces
⚫ Cellular/WLAN COEX interface*
⚫ Antenna tuner control interface
⚫ Configuration pins
4.1. (U)SIM Interface
The (U)SIM interface circuitry meets ISO/IEC 7816-3, ETSI and IMT-2000 requirements. Both Class B
(3.0 V) and Class C (1.8 V) (U)SIM cards are supported.
4.1.1. Pin definition of (U)SIM
RM520N-GL has two (U)SIM interfaces, and supports dual SIM single standby.
Table 14: Pin Definition of (U)SIM Interface
Pin No.
Pin Name
I/O
Description
DC Characteristics
36
USIM1_VDD
PO
Power supply for (U)SIM1 card
USIM1_VDD
1.8/3.0 V
34
USIM1_DATA
DIO, PU
(U)SIM1 card data
USIM1_VDD
1.8/3.0 V
32
USIM1_CLK
DO, PD
(U)SIM1 card clock
USIM1_VDD
1.8/3.0 V
30
USIM1_RST
DO, PD
(U)SIM1 card reset
USIM1_VDD
1.8/3.0 V
66
USIM1_DET
DI, PU
(U)SIM1 card hot-plug detect
1.8 V