Quectel BC66 Hardware Design page 7

Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 12
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 14
FIGURE 3: MODULE POWER CONSUMPTION IN DIFFERENT MODES (MODEM) .................................... 20
FIGURE 4: TIMING OF WAKING UP MODULE FROM DEEP SLEEP ............................................................ 20
FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY ............................................................................ 22
FIGURE 6: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................... 23
FIGURE 7: TURN ON THE MODULE USING KEYSTROKE ........................................................................... 23
FIGURE 8: POWER UP TIMING ....................................................................................................................... 23
FIGURE 9: POWER DOWN TIMING (POWER OFF BY AT COMMAND) ........................................................ 24
FIGURE 10: POWER DOWN TIMING (POWER OFF BY DISCONNECTING VBAT) ...................................... 24
FIGURE 11: REFERENCE CIRCUIT OF RESET BY USING DRIVING CIRCUIT ........................................... 25
FIGURE 12: REFERENCE CIRCUIT OF RESET BY USING BUTTON ........................................................... 25
FIGURE 13: RESET TIMING ............................................................................................................................. 26
FIGURE 14: USB INTERFACE REFERENCE DESIGN ................................................................................... 27
FIGURE 15: REFERENCE DESIGN FOR MAIN UART PORT......................................................................... 29
FIGURE 16: REFERENCE DESIGN OF DEBUG UART PORT ....................................................................... 29
FIGURE 17: REFERENCE DESIGN OF AUXILIARY UART PORT .................................................................. 30
FIGURE 18: REFERENCE CIRCUIT WITH VOLTAGE LEVEL TRANSLATOR CHIP ...................................... 30
FIGURE 19: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 31
FIGURE 20: SKETCH MAP FOR RS-232 INTERFACE MATCH ...................................................................... 31
FIGURE 21: REFERENCE CIRCUIT FOR USIM INTERFACE WITH A 6-PIN USIM CARD CONNECTOR ... 33
FIGURE 22: RI BEHAVIOUR WHEN URC OR A SMS MESSAGE RECEIVED ............................................... 34
FIGURE 23: REFERENCE DESIGN OF NETLIGHT ........................................................................................ 35
FIGURE 24: REFERENCE DESIGN OF NB-IOT ANTENNA INTERFACE ...................................................... 38
FIGURE 25: MICROSTRIP DESIGN ON A 2-LAYER PCB ............................................................................... 38
FIGURE 26: COPLANAR WAVEGUIDE DESIGN ON A 2-LAYER PCB ........................................................... 38
FIGURE 27: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)
................................................................................................................................................................... 39
FIGURE 28: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND)
................................................................................................................................................................... 39
FIGURE 29: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM) ................................................ 43
FIGURE 30: MECHANICALS OF U.FL-LP CONNECTORS ............................................................................. 43
FIGURE 31: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 44
FIGURE 32: TOP VIEW OF THE MODULE ...................................................................................................... 52
FIGURE 33: BOTTOM VIEW OF THE MODULE .............................................................................................. 52
FIGURE 34: TAPE DIMENSIONS (UNIT: MM) .................................................................................................. 56
FIGURE 35: REEL DIMENSIONS (UNIT: MM) ................................................................................................. 56
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NB-IoT Module Series
BC66 Hardware Design
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