Product Info

LTE Standard Module Series
EC21_Series_Mini_PCIe_Hardware_Design
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Figure 3: Reference Circuit of Power Supply
3.6. (U)SIM Interface
The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8 V and 3.0 V (U)SIM
cards are supported. The following table shows the pin definition of (U)SIM interface.
Table 8: Pin Definition of (U)SIM Interface
EC21 series 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. See document [1] 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 Power Domain Description
USIM_VDD 8 PO 1.8/3.0 V (U)SIM card power supply
USIM_DATA 10 DIO 1.8/3.0 V (U)SIM card data
USIM_CLK 12 DO 1.8/3.0 V (U)SIM card clock
USIM_RST 14 DO 1.8/3.0 V (U)SIM card reset
USIM_PRESENCE 44 DI 1.8 V (U)SIM card insertion detect