Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 11 / 126
Figure Index
Figure 2: Pin Assignment (Top View) ................................................................................................................ 23
Figure 3: Sleep Mode Application via UART ..................................................................................................... 37
Figure 4: Sleep Mode Application with USB Remote Wakeup .......................................................................... 37
Figure 5: Sleep Mode Application with RI.......................................................................................................... 38
Figure 6: Sleep Mode Application without Suspend Function ........................................................................... 39
Figure 7: Power Supply Limits during Burst Transmission ................................................................................ 40
Figure 8: Star Structure of the Power Supply .................................................................................................... 41
Figure 9: Reference Circuit of Power Supply .................................................................................................... 41
Figure 10: Turn on the Module by Using Driving Circuit .................................................................................... 42
Figure 11: Turn on the Module by Using Keystroke .......................................................................................... 43
Figure 12: Timing of Turning on Module............................................................................................................ 44
Figure 13: Timing of Turning off Module............................................................................................................ 45
Figure 14: Reference Circuit of RESET_N by Using Driving Circuit ................................................................. 46
Figure 15: Reference Circuit of RESET_N by Using Button ............................................................................. 46
Figure 16: Timing of Resetting Module.............................................................................................................. 47
Figure 17: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector ................................. 48
Figure 18: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector ................................... 48
Figure 19: Reference Circuit of USB Application .............................................................................................. 50
Figure 20: Reference Circuit with Translator Chip ............................................................................................ 52
Figure 21: Reference Circuit with Transistor Circuit .......................................................................................... 52
Figure 22: Primary Mode Timing ....................................................................................................................... 53
Figure 23: Auxiliary Mode Timing ...................................................................................................................... 54
Figure 24: Reference Circuit of PCM and I2C Application with Audio Codec ................................................... 55
Figure 25: Reference Circuit of SD Card Interface ............................................................................................ 56
Figure 26: Reference Circuit of Wireless Connectivity Interfaces with FC20 Module ....................................... 59
Figure 27: Simplified Block Diagram for Ethernet Application ........................................................................... 62
Figure 28: Reference Circuit of SGMII Interface with PHY AR8033 Application .............................................. 63
Figure 29: Reference Circuit of the Network Indicator ...................................................................................... 64
Figure 30: Reference Circuits of STATUS......................................................................................................... 65
Figure 31: Reference Circuit of USB_BOOT Interface ...................................................................................... 67
Figure 32: Timing Sequence for Entering Emergency Download Mode ........................................................... 67
Figure 33: Reference Circuit of RF Antenna Interface ...................................................................................... 72
Figure 34: Microstrip Design on a 2-layer PCB ................................................................................................. 73
Figure 35: Coplanar Waveguide Design on a 2-layer PCB ............................................................................... 73
Figure 36: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) ............................ 73
Figure 37: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) ............................ 74
Figure 38: Reference Circuit of GNSS Antenna ................................................................................................ 75
Figure 39: Dimensions of the U.FL-R-SMT Connector (Unit: mm) ................................................................... 77
Figure 40: Mechanicals of U.FL-LP Connectors ............................................................................................... 77
Figure 41: Space Factor of Mated Connector (Unit: mm) ................................................................................. 78
Figure 42: Referenced Heatsink Design (Heatsink at the Top of the Module) ................................................ 115