Service Guide

LTE Standard Module Series
EG915U_Series_Hardware_Design 9 / 90
Figure Index
Figure 1: Functional Diagram ..................................................................................................................... 16
Figure 2: Pin Assignment (Top View) ......................................................................................................... 17
Figure 3: Sleep Mode Application via UART .............................................................................................. 28
Figure 4: Sleep Mode Application with USB Remote Wakeup .................................................................. 29
Figure 5: Sleep Mode Application with MAIN_RI ....................................................................................... 30
Figure 6: Sleep Mode Application without Suspend Function ................................................................... 31
Figure 7: Reference Design of Power Supply ............................................................................................ 33
Figure 8: Power Supply Limits during Burst Transmission ........................................................................ 34
Figure 9: Power Supply .............................................................................................................................. 34
Figure 10: Turning on the Module Using Driving Circuit ............................................................................ 35
Figure 11: Turning on the Module Using Button ........................................................................................ 35
Figure 12: Power-up Timing ....................................................................................................................... 36
Figure 13: Timing of Turning off the Module .............................................................................................. 37
Figure 14: Reference Circuit of RESET_N by Using Driving Circuit ......................................................... 38
Figure 15: Reference Circuit of RESET_N by Using Button...................................................................... 38
Figure 16: Timing of Resetting the Module ................................................................................................ 39
Figure 17: Reference Design for Microphone Interface ............................................................................. 41
Figure 18: Reference Design for Receiver Interface ................................................................................. 42
Figure 19: Reference Circuit of USB Application ....................................................................................... 43
Figure 20: Reference Circuit of USB_BOOT Interface .............................................................................. 44
Figure 21: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector ......................... 46
Figure 22: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector ........................... 46
Figure 23: Reference Circuit of I2C and PCM Application with Audio Codec ........................................... 48
Figure 24: Reference Circuit with Translator Chip ..................................................................................... 50
Figure 25: Reference Circuit with Transistor Circuit .................................................................................. 50
Figure 26: Reference Circuit of Network Status Indication ........................................................................ 54
Figure 27: Reference Circuit of STATUS ................................................................................................... 55
Figure 28: Reference Circuit of RF Antennas ............................................................................................ 59
Figure 29: Microstrip Design on a 2-layer PCB ......................................................................................... 59
Figure 30: Coplanar Waveguide Design on a 2-layer PCB ....................................................................... 60
Figure 31: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) .................... 60
Figure 32: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) .................... 60
Figure 33: Dimensions of U.FL-R-SMT Connector (Unit: mm) .................................................................. 62
Figure 34: Mechanicals of U.FL-LP Connectors ........................................................................................ 62
Figure 35: Space Factor of Mated Connector (Unit: mm) .......................................................................... 63
Figure 36: Module Top and Side Dimensions (Unit: mm) .......................................................................... 77
Figure 37: Module Bottom Dimensions ...................................................................................................... 78
Figure 38: Recommended Footprint (Top View) ........................................................................................ 79
Figure 39: Top and Bottom Views .............................................................................................................. 80
Figure 40: Recommended Reflow Soldering Thermal Profile ................................................................... 82
Figure 41: Carrier Tape Dimension Drawing .............................................................................................. 84