Product Info

LTE Standard Module Series
EG91 Hardware Design
EG91_Hardware_Design 8 / 93
Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 16
FIGURE 2: PIN ASSIGNMENT (TOP VIEW)..................................................................................................... 18
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: SLEEP MODE APPLICATION WITHOUT SUSPEND FUNCTION ................................................ 29
FIGURE 7: POWER SUPPLY LIMITS DURING BURST TRANSMISSION ...................................................... 31
FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY............................................................................ 32
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 32
FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................. 33
FIGURE 11: TURN ON THE MODULE USING BUTTON ................................................................................. 34
FIGURE 12: POWER-ON SCENARIO .............................................................................................................. 34
FIGURE 13: POWER-OFF SCENARIO ............................................................................................................ 35
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 36
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 37
FIGURE 16: RESET SCENARIO ...................................................................................................................... 37
FIGURE 17: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH AN 8-PIN (U)SIM CARD CONNECTOR
................................................................................................................................................................... 39
FIGURE 18: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH A 6-PIN (U)SIM CARD CONNECTOR . 39
FIGURE 19: REFERENCE CIRCUIT OF USB INTERFACE ............................................................................ 41
FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP ................................................................... 43
FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 44
FIGURE 22: PRIMARY MODE TIMING ............................................................................................................ 45
FIGURE 23: AUXILIARY MODE TIMING .......................................................................................................... 45
FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC .................................... 46
FIGURE 25: REFERENCE CIRCUIT OF SPI INTERFACE WITH PERIPHERALS ......................................... 47
FIGURE 26: REFERENCE CIRCUIT OF NETWORK STATUS INDICATOR ................................................... 48
FIGURE 27: REFERENCE CIRCUIT OF STATUS ........................................................................................... 49
FIGURE 28: REFERENCE CIRCUIT OF USB_BOOT INTERFACE ................................................................ 51
FIGURE 29: TIMING SEQUENCE FOR ENTERING INTO EMERGENCY DOWNLOAD MODE .................... 52
FIGURE 30: REFERENCE CIRCUIT OF RF ANTENNA INTERFACE ............................................................. 57
FIGURE 31: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB ...................................................................... 57
FIGURE 32: COPLANAR WAVEGUIDE DESIGN ON A 2-LAYER PCB ........................................................... 58
FIGURE 33: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)
................................................................................................................................................................... 58
FIGURE 34: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND)
................................................................................................................................................................... 58
FIGURE 35: REFERENCE CIRCUIT OF GNSS ANTENNA ............................................................................. 60
FIGURE 36: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM) ................................................ 61
FIGURE 37: MECHANICALS OF U.FL-LP CONNECTORS ............................................................................. 62
FIGURE 38: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 62