Product Info

LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 20 / 64
3 Application Interfaces
The physical connections and signal levels of EC21 Mini PCIe comply with PCI Express Mini CEM
specifications. This chapter mainly describes the definition and application of the following interfaces of
EC21 Mini PCIe:
 Power supply
 (U)SIM interface
 USB interface
 UART interface
 PCM and I2C interfaces
 Control and indicator signals
 Antenna interfaces
3.1. Pin Assignment
The following figure shows the pin assignment of EC21 Mini PCIe module. The top side contains EC21
module and antenna connectors.
Figure 2: Pin Assignment