Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 13 / 134
Figure Index
Figure 1: Functional Diagram ........................................................................................................................ 2422
Figure 2: Pin Assignment (Top View) ............................................................................................................ 2624
Figure 3: Sleep Mode Application via UART ................................................................................................. 4038
Figure 4: Sleep Mode Application with USB Remote Wakeup ...................................................................... 4038
Figure 5: Sleep Mode Application with RI...................................................................................................... 4139
Figure 6: Sleep Mode Application without Suspend Function ....................................................................... 4240
Figure 7: Power Supply Limits during Burst Transmission ............................................................................ 4341
Figure 8: Star Structure of the Power Supply ................................................................................................ 4442
Figure 9: Reference Circuit of Power Supply ................................................................................................ 4543
Figure 10: Turn on the Module by Using Driving Circuit ................................................................................ 4644
Figure 11: Turn on the Module by Using Keystroke ...................................................................................... 4644
Figure 12: Timing of Turning on Module........................................................................................................ 4745
Figure 13: Timing of Turning off Module........................................................................................................ 4846
Figure 14: Reference Circuit of RESET_N by Using Driving Circuit ............................................................. 4947
Figure 15: Reference Circuit of RESET_N by Using Button ......................................................................... 4947
Figure 16: Timing of Resetting Module.......................................................................................................... 5048
Figure 17: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector ............................. 5149
Figure 18: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector ............................... 5149
Figure 19: Reference Circuit of USB Application .......................................................................................... 5351
Figure 20: Reference Circuit with Translator Chip ........................................................................................ 5553
Figure 21: Reference Circuit with Transistor Circuit ...................................................................................... 5553
Figure 22: Primary Mode Timing ................................................................................................................... 5654
Figure 23: Auxiliary Mode Timing .................................................................................................................. 5755
Figure 24: Reference Circuit of PCM and I2C Application with Audio Codec ............................................... 5856
Figure 25: Reference Circuit of SD Card Interface ........................................................................................ 5957
Figure 26: Reference Circuit of Wireless Connectivity Interfaces with FC20 Module ................................... 6260
Figure 27: Simplified Block Diagram for Ethernet Application ....................................................................... 6563
Figure 28: Reference Circuit of SGMII Interface with PHY AR8033 Application .......................................... 6664
Figure 29: Reference Circuit of the Network Indicator .................................................................................. 6765
Figure 30: Reference Circuits of STATUS..................................................................................................... 6866
Figure 31: Reference Circuit of USB_BOOT Interface .................................................................................. 7068
Figure 32: Timing Sequence for Entering Emergency Download Mode ....................................................... 7068
Figure 33: Reference Circuit of RF Antenna Interface .................................................................................. 7573
Figure 34: Microstrip Design on a 2-layer PCB ............................................................................................. 7674
Figure 35: Coplanar Waveguide Design on a 2-layer PCB ........................................................................... 7674
Figure 36: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) ........................ 7674
Figure 37: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) ........................ 7775
Figure 38: Reference Circuit of GNSS Antenna ............................................................................................ 7876
Figure 39: Dimensions of the U.FL-R-SMT Connector (Unit: mm) ............................................................... 8078
Figure 40: Mechanicals of U.FL-LP Connectors ........................................................................................... 8078
Figure 41: Space Factor of Mated Connector (Unit: mm) ............................................................................. 8179