Quectel EG915U-EU Manual page 9

LTE Standard Module Series
Figure Index
Figure 1: EG915U-EU Functional Diagram ............................................................................................... 15
Figure 2: EG915U-EU Pin Assignment (Top View) .................................................................................... 16
Figure 3: Sleep Mode Application via UART .............................................................................................. 27
Figure 4: Sleep Mode Application with USB Remote Wakeup .................................................................. 28
Figure 5: Sleep Mode Application with RI .................................................................................................. 29
Figure 6: Reference Design of Power Supply ............................................................................................ 31
Figure 7: Power Supply Limits during Burst Transmission ........................................................................ 31
Figure 8: Star Structure of the Power Supply ............................................................................................ 32
Figure 9: Reference Circuit of Turing on the Module with Driving Circuit .................................................. 33
Figure 10: Reference Circuit of Turing on the Module with Keystroke ...................................................... 33
Figure 11: Power-on Timing ....................................................................................................................... 34
Figure 12: Power-down Timing .................................................................................................................. 35
Figure 13: Reference Circuit of RESET_N with Driving Circuit ................................................................. 36
Figure 14: Reference Circuit of RESET_N with Button ............................................................................. 36
Figure 15: Reset Timing ............................................................................................................................. 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 a 6-Pin (U)SIM Card Connector .............................................................. 44
Figure 22: Reference Circuit of PCM Application with Audio Codec ......................................................... 46
Figure 23: Reference Circuit with Translator Chip ..................................................................................... 47
Figure 24: Reference Circuit with Transistor Circuit .................................................................................. 48
Figure 25: Reference Circuit of the Network Status Indication .................................................................. 52
Figure 26: Reference Circuits of STATUS ................................................................................................. 52
Figure 27: Reference Circuit for RF Antenna Interfaces ............................................................................ 56
Figure 28: Microstrip Design on a 2-layer PCB ......................................................................................... 58
Figure 29: Coplanar Waveguide Design on a 2-layer PCB ....................................................................... 58
Figure 30: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) .................... 59
Figure 31: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) .................... 59
Figure 32: Dimensions of U.FL-R-SMT Connector (Unit: mm) .................................................................. 60
Figure 33: Mechanicals of U.FL-LP Connectors ........................................................................................ 61
Figure 34: Space Factor of Mated Connector (Unit: mm) .......................................................................... 61
Figure 35: Module Top and Side Dimensions (Unit: mm) .......................................................................... 66
Figure 36: Module Bottom Dimensions ...................................................................................................... 67
Figure 37: Recommended Footprint (TOP View) ....................................................................................... 68
Figure 38: Top & Bottom Views of the Module ........................................................................................... 69
Figure 39: Recommended Reflow Soldering Thermal Profile ................................................................... 72
Figure 40: Tape Specifications ................................................................................................................... 74
Figure 41: Reel Specifications ................................................................................................................... 74
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