Quectel EG91 Series Hardware Design

Also see for EG91 Series: Hardware design Hardware design Hardware design

Contents

Quectel EG91 Series Hardware Design Manual pdf 10 page image

LTE Module SeriesEG91 Hardware DesignEG91_Hardware_Design 9 / 93Figure IndexFIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 20FIGURE 2: PIN ASSIGNMENT (TOP VIEW) .................................................................................................... 22FIGURE 3: SLEEP MODE APPLICATION VIA UART ....................................................................................... 31FIGURE 4: SLEEP MODE APPLICATION WITH USB REMOTE WAKEUP .................................................... 32FIGURE 5: SLEEP MODE APPLICATION WITH RI ......................................................................................... 33FIGURE 6: SLEEP MODE APPLICATION WITHOUT SUSPEND FUNCTION ................................................ 34FIGURE 7: POWER SUPPLY LIMITS DURING BURST TRANSMISSION ...................................................... 35FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY............................................................................ 36FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 36FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................. 37FIGURE 11: TURN ON THE MODULE USING BUTTON ................................................................................. 38FIGURE 12: POWER-ON SCENARIO .............................................................................................................. 38FIGURE 13: POWER-OFF SCENARIO ............................................................................................................ 39FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 40FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 41FIGURE 16: RESET SCENARIO ...................................................................................................................... 41FIGURE 17: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH AN 8-PIN (U)SIM CARD CONNECTOR................................................................................................................................................................... 43FIGURE 18: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH A 6-PIN (U)SIM CARD CONNECTOR . 43FIGURE 19: REFERENCE CIRCUIT OF USB INTERFACE ............................................................................ 45FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP ................................................................... 47FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 48FIGURE 22: PRIMARY MODE TIMING ............................................................................................................ 49FIGURE 23: AUXILIARY MODE TIMING .......................................................................................................... 49FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC .................................... 50FIGURE 25: REFERENCE CIRCUIT OF SPI INTERFACE WITH PERIPHERALS ......................................... 51FIGURE 26: REFERENCE CIRCUIT OF NETWORK STATUS INDICATOR ................................................... 52FIGURE 27: REFERENCE CIRCUIT OF STATUS ........................................................................................... 53FIGURE 28: REFERENCE CIRCUIT OF USB_BOOT INTERFACE ................................................................ 55FIGURE 29: TIMING SEQUENCE FOR ENTERING INTO EMERGENCY DOWNLOAD MODE .................... 56FIGURE 30: REFERENCE CIRCUIT OF RF ANTENNA INTERFACE ............................................................. 61FIGURE 31: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB ...................................................................... 62FIGURE 32: COPLANAR WAVEGUIDE DESIGN ON A 2-LAYER PCB ........................................................... 62FIGURE 33: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)................................................................................................................................................................... 62FIGURE 34: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND)................................................................................................................................................................... 62FIGURE 35: REFERENCE CIRCUIT OF GNSS ANTENNA ............................................................................. 64FIGURE 36: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM) ................................................ 65FIGURE 37: MECHANICALS OF U.FL-LP CONNECTORS ............................................................................. 66FIGURE 38: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 66