LTE Module Series
EC20 Mini PCIe Hardware Design
EC20_Mini_PCIe_Hardware_Design Confidential / Released 13 / 36
3
Application Interface
3.1. General Description
The physical connections and signal levels of EC20 Mini PCIe comply with PCI Express Mini CEM
specifications. This chapter mainly describes the following interface definition and application of EC20
Mini PCIe:
Power supply
USIM interface
USB interface
UART interface
PCM&I2C interface
Control signals
Antenna interface
3.2. EC20 Mini PCIe Interface
3.2.1. Definition of Interface
The following tables show the pin assignments of EC20 Mini PCIe on the 52-pin application.
Table 3: Definition of IO Parameters
Type
Description
IO
Bidirectional input/output
DI
Digital input
DO
Digital output
OC
Open collector
OD
Open drain
PI
Power input
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