Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 8 / 134
Contents
About the Document ................................................................................................................................... 3
Contents ....................................................................................................................................................... 8
Table Index ................................................................................................................................................. 11
Figure Index ............................................................................................................................................... 13
1 Introduction ........................................................................................................................................ 15
1.1. Safety Information................................................................................................................ 1716
2 Product Concept ............................................................................................................................ 1917
2.1. General Description ............................................................................................................. 1917
2.2. Key Features ....................................................................................................................... 2119
2.3. Functional Diagram ............................................................................................................. 2321
2.4. Evaluation Board ................................................................................................................. 2422
3 Application Interfaces ................................................................................................................... 2523
3.1. General Description ............................................................................................................. 2523
3.2. Pin Assignment .................................................................................................................... 2523
3.3. Pin Description ..................................................................................................................... 2725
3.4. Operating Modes ................................................................................................................. 3937
3.5. Power Saving ....................................................................................................................... 3937
3.5.1. Sleep Mode ................................................................................................................ 3937
3.5.1.1. UART Application ............................................................................................. 3937
3.5.1.2. USB Application with USB Remote Wakeup Function .................................... 4038
3.5.1.3. USB Application with USB Suspend/Resume and RI Function ...................... 4139
3.5.1.4. USB Application without USB Suspend Function ............................................ 4139
3.5.2. Airplane Mode ............................................................................................................ 4240
3.6. Power Supply ....................................................................................................................... 4341
3.6.1. Power Supply Pins ..................................................................................................... 4341
3.6.2. Decrease Voltage Drop .............................................................................................. 4341
3.6.3. Reference Design for Power Supply .......................................................................... 4442
3.6.4. Monitor the Power Supply .......................................................................................... 4543
3.7. Power-on/off Scenarios ....................................................................................................... 4543
3.7.1. Turn on Module Using the PWRKEY ......................................................................... 4543
3.7.2. Turn off Module .......................................................................................................... 4745
3.7.2.1. Turn off Module Using the PWRKEY Pin ........................................................ 4846
3.7.2.2. Turn off Module Using AT Command .............................................................. 4846
3.8. Reset Module ....................................................................................................................... 4846
3.9. (U)SIM Interface .................................................................................................................. 5048
3.10. USB Interface ...................................................................................................................... 5250
3.11. UART Interfaces .................................................................................................................. 5351
3.12. PCM and I2C Interfaces ...................................................................................................... 5654