Quectel BC65 Hardware Design page 9

NB-IoT Module Series
BC65 Hardware Design
Figure Index
Figure 1: Functional Diagram ..................................................................................................................... 13
Figure 2: Pin Assignment (Top View) ......................................................................................................... 15
Figure 3: Module (Modem) Power Consumption in Different Modes ........................................................ 20
Figure 4: Timing of Waking Up Module from Deep Sleep.......................................................................... 21
Figure 5: Reference Circuit for Power Supply ........................................................................................... 22
Figure 6: Turn on the Module by Using Driver Circuit ................................................................................ 23
Figure 7: Turn on the Module by Using Button .......................................................................................... 23
Figure 8: Turn-on Timing ............................................................................................................................ 24
Figure 9: Turn-off Timing (Turn Off by Disconnecting VBAT) .................................................................... 25
Figure 10: Turn-off Timing (Turn Off by AT Command AT+QPOWD=1) .................................................... 25
Figure 11: Reference Circuit of RESET_N by Using Driving Circuit .......................................................... 26
Figure 12: Reference Circuit of RESET_N by Using Button...................................................................... 26
Figure 13: Reset Timing ............................................................................................................................. 27
Figure 14: Reference Design for Main UART Interface ............................................................................. 28
Figure 15: Reference Design for Debug UART Interface .......................................................................... 28
Figure 16: Reference Design for Auxiliary UART Interface ....................................................................... 29
Figure 17: Reference Circuit with Level Translator Chip ........................................................................... 29
Figure 18: Reference Circuit with Transistor Circuit .................................................................................. 30
Figure 19: Sketch Map for RS-232 Interface Match .................................................................................. 30
Figure 20: Reference Circuit for USIM Interface with a 6-pin USIM Card Connector ............................... 32
Figure 21: RI Timing When a URC Is Received ........................................................................................ 33
Figure 22: Reference Design for NETLIGHT ............................................................................................. 34
Figure 23: Reference Design for NB-IoT Antenna Interface ...................................................................... 36
Figure 24: Microstrip Design on a 2-layer PCB ......................................................................................... 37
Figure 25: Coplanar Waveguide Design on a 2-layer PCB ....................................................................... 37
Figure 26: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) .................... 38
Figure 27: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) .................... 38
Figure 28: Dimensions of the U.FL-R-SMT Connector (Unit: mm) ............................................................ 39
Figure 29: Mechanicals of U.FL-LP Connectors ........................................................................................ 40
Figure 30: Space Factor of Mated Connector (Unit: mm) .......................................................................... 40
Figure 31: Module Top and Side Dimensions (Unit: mm) .......................................................................... 45
Figure 32: Module Bottom Dimension (Bottom View, Unit: mm) ............................................................... 46
Figure 33: Recommended Footprint (Top View, Unit: mm) ........................................................................ 47
Figure 34: Top View of the Module ............................................................................................................. 48
Figure 35: Bottom View of the Module ....................................................................................................... 48
Figure 36: Recommended Reflow Soldering Thermal Profile ................................................................... 50
Figure 37: Tape Dimensions (Unit: mm) .................................................................................................... 52
Figure 38: Reel Dimensions (Unit: mm) ..................................................................................................... 52
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