Quectel BG77, Hardware Design

Page: 4 / 80

LPWA Module Series
BG77 Hardware Design
BG77_Hardware_Design 3 / 76
Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 3
Table Index ............................................................................................................................................... 5
Figure Index .............................................................................................................................................. 7
1
Introduction ....................................................................................................................................... 9
1.1. Safety Information .................................................................................................................. 10
2
Product Concept ............................................................................................................................. 11
2.1. General Description ................................................................................................................ 11
2.2. Key Features .......................................................................................................................... 12
2.3. Functional Diagram ................................................................................................................ 13
2.4. Evaluation Board .................................................................................................................... 14
3
Application Interfaces ..................................................................................................................... 15
3.1. Pin Assignment ...................................................................................................................... 16
3.2. Pin Description ....................................................................................................................... 17
3.3. Operating Modes .................................................................................................................... 24
3.4. Power Saving ......................................................................................................................... 25
3.4.1. Airplane Mode .............................................................................................................. 25
3.4.2. Power Saving Mode (PSM).......................................................................................... 26
3.4.3. Extended Idle Mode DRX (e-I-DRX) ............................................................................ 27
3.4.4. Sleep Mode.................................................................................................................. 27
3.4.4.1. UART Application .............................................................................................. 27
3.5. Power Supply ......................................................................................................................... 28
3.5.1. Power Supply Pins ....................................................................................................... 28
3.5.2. Decrease Voltage Drop ............................................................................................... 29
3.5.3. Monitor the Power Supply ............................................................................................ 29
3.6. Power on and off Scenarios ................................................................................................... 30
3.6.1. Turn on Module Using the PWRKEY Pin ..................................................................... 30
3.6.2. Turn off Module ............................................................................................................ 32
3.6.2.1. Turn off Module Using the PWRKEY Pin ........................................................... 32
3.6.2.2. Turn off Module Using AT Command ................................................................ 32
3.7. Reset the Module* .................................................................................................................. 32
3.8. PON_TRIG Interface .............................................................................................................. 34
3.9. (U)SIM Interface ..................................................................................................................... 35
3.10. USB Interface ......................................................................................................................... 37
3.11. UART Interfaces ..................................................................................................................... 39
3.12. PCM and I2C Interfaces* ........................................................................................................ 42
3.13. Network Status Indication ....................................................................................................... 43
3.14. STATUS ................................................................................................................................. 44