Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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Figure Index
Figure 1: Functional Diagram ................................................................................................................................ 22
Figure 2: Pin Assignment (Top View)..................................................................................................................... 24
Figure 3: Sleep Mode Application via UART.........................................................................................................33
Figure 4: Sleep Mode Application with USB Remote Wakeup.......................................................................... 33
Figure 5: Sleep Mode Application with RI..............................................................................................................34
Figure 6: Sleep Mode Application without Suspend Function........................................................................... 35
Figure 7: Power Supply Limits during Burst Transmission.................................................................................37
Figure 8: Star Structure of Power Supply..............................................................................................................37
Figure 9: Reference Circuit of Power Supply....................................................................................................... 38
Figure 10: Turn on the Module Using Driving Circuit.......................................................................................... 39
Figure 11: Turn on the Module Using A Button.....................................................................................................39
Figure 12: Power-up Timing.....................................................................................................................................40
Figure 13: Power-down Timing............................................................................................................................... 41
Figure 14: Reference Circuit of RESET_N by Using Driving Circuit................................................................ 42
Figure 15: Reference Circuit of RESET_N by Using A Button...........................................................................42
Figure 16: Timing of Resetting the Module........................................................................................................... 43
Figure 17: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector.............................44
Figure 18: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector............................... 45
Figure 19: Reference Circuit of USB Interface..................................................................................................... 46
Figure 20: Reference Circuit with Translator Chip...............................................................................................48
Figure 21: Reference Circuit with Transistor Circuit............................................................................................ 49
Figure 22: Primary Mode Timing.............................................................................................................................50
Figure 23: Auxiliary Mode Timing............................................................................................................................50
Figure 24: Reference Circuit of PCM Application with Audio Codec................................................................ 51
Figure 25: Reference Circuit of SPI Interface with Peripherals......................................................................... 52
Figure 26: Reference Circuit of Network Status Indication................................................................................ 53
Figure 27: Reference Circuit of STATUS...............................................................................................................54
Figure 28: Reference Circuit of USB_BOOT Interface....................................................................................... 56
Figure 29: Emergency Download Mode Timing................................................................................................... 57
Figure 30: Reference Circuit of RF Antenna Interface........................................................................................62
Figure 31: Reference Circuit of GNSS Antenna...................................................................................................63
Figure 32: Microstrip Design on a 2-layer PCB....................................................................................................64
Figure 33: Coplanar Waveguide Design on a 2-layer PCB................................................................................64
Figure 34: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground).......................65
Figure 35: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground).......................65
Figure 36: Dimensions of the U.FL-R-SMT Connector (Unit: mm)................................................................... 67
Figure 37: Mechanicals of U.FL-LP Connectors.................................................................................................. 67
Figure 38: Space Factor of Mated Connector (Unit: mm).................................................................................. 68
Figure 39: Referenced Heatsink Design (Heatsink at the Top of the Module)................................................90
Figure 40: Referenced Heatsink Design (Heatsink at the Backside of Customers’ PCB)............................90
Figure 41: Module Top and Side Dimensions.......................................................................................................92