Quectel EG915U Series User Manual

LTE Standard Module Series
EG915U_Series_Hardware_Design 8 / 81
Figure Index
Figure 1: Functional Diagram ..................................................................................................................... 14
Figure 2: EG915U Series Module Pin Assignment (Top View) .................................................................. 15
Figure 3: Sleep Mode Application via UART .............................................................................................. 26
Figure 4: Sleep Mode Application with USB Remote Wakeup .................................................................. 27
Figure 5: Sleep Mode Application with MAIN_RI ....................................................................................... 29
Figure 6: Reference Design of Power Supply ............................................................................................ 31
Figure 7: Power Supply Limits during Burst Transmission ........................................................................ 32
Figure 8: Power Supply .............................................................................................................................. 32
Figure 9: Turing on the Module Using Driving Circuit ................................................................................ 33
Figure 10: Turing on the Module Using Button .......................................................................................... 33
Figure 11: Power-up Timing ....................................................................................................................... 34
Figure 12: Timing of Turning off Module .................................................................................................... 35
Figure 13: Reference Circuit of RESET_N by Using Driving Circuit ......................................................... 36
Figure 14: Reference Circuit of RESET_N by Using Button...................................................................... 36
Figure 15: Timing of Resetting the Module ................................................................................................ 37
Figure 16: Reference Design for Microphone Interface ............................................................................. 39
Figure 17: Reference Design for Receiver Interface ................................................................................. 40
Figure 18: Reference Circuit of USB Application ....................................................................................... 41
Figure 19: Reference Circuit of USB_BOOT Interface .............................................................................. 42
Figure 20: Reference Circuit of (U)SIM Interface with an 8-Pin (U)SIM Card Connector ......................... 44
Figure 21: Reference Circuit of (U)SIM Interface with a 6-Pin (U)SIM Card Connector ........................... 44
Figure 22: Reference Circuit of I2 C and PCM Application with Audio Codec .......................................... 46
Figure 23: Reference Circuit with Translator Chip ..................................................................................... 48
Figure 24: Reference Circuit with Transistor Circuit .................................................................................. 48
Figure 25: Reference Circuit of Wake up Module from PSM ..................................................................... 51
Figure 26: Reference Circuit of Network Status Indication ........................................................................ 52
Figure 27: Reference Circuits of STATUS ................................................................................................. 53
Figure 28: Reference Circuit of RF Antenna .............................................................................................. 58
Figure 29: Microstrip Design on a 2-layer PCB ......................................................................................... 58
Figure 30: Coplanar Waveguide Design on a 2-layer PCB ....................................................................... 59
Figure 31: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) .................... 59
Figure 32: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) .................... 59
Figure 33: Dimensions of U.FL-R-SMT Connector (Unit: mm) .................................................................. 61
Figure 34: Mechanicals of U.FL-LP Connectors ........................................................................................ 61
Figure 35: Space Factor of Mated Connector (Unit: mm) .......................................................................... 62
Figure 36: Module Top and Side Dimensions (Unit: mm) .......................................................................... 76
Figure 37: Module Bottom Dimensions ...................................................................................................... 77
Figure 38: Recommended Footprint (TOP View) ....................................................................................... 78
Figure 39: Top & Bottom Views of the Module ........................................................................................... 79
Figure 40: Recommended Reflow Soldering Thermal Profile ................................................................... 81
Figure 41: Tape Specifications ................................................................................................................... 83

Quectel EG915U Series Specifications

General

Brand	Quectel
Model	EG915U Series
Category	Control Unit
Language	English