Product Info

LTE Standard Module Series
EC21_Series_Mini_PCIe_Hardware_Design
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3
Application Interfaces
The physical connections and signal levels of EC21 series Mini PCIe comply with PCI Express Mini Card
Electromechanical Specification. This chapter mainly describes the definition and application of the
following interfaces/pins of EC21 series Mini PCIe.

Power supply

(U)SIM interface

USB interface

UART interface

PCM and I2C interfaces

Control and indication interfaces
3.1. Pin Assignment
The following figure shows the pin assignment of EC21 series Mini PCIe module. The top side contains
EC21 series module and antenna connectors.
Figure 2: Pin Assignment