Quectel FC21 Hardware Design page 7

Wi-Fi&BT Module Series
FC21 Hardware Design
Figure Index
Figure 1: Functional Diagram of FC21 Module....................................................................................... 11
Figure 2: Pin Assignment of FC21 Module ............................................................................................. 14
Figure 3: Reference Circuit for VDD_3V3 .............................................................................................. 19
Figure 4: Timing of Turning on/off FC21 Module .................................................................................... 20
Figure 5: Wi-Fi Interface Connection ..................................................................................................... 20
Figure 6: SDIO Interface Connection ..................................................................................................... 22
Figure 7: Block Diagram of BT Interface Connection ............................................................................. 23
Figure 8: Reference Design for PCM Interface ...................................................................................... 25
Figure 9: Reference Design for UART Interface Connection .................................................................. 25
Figure 10: Coexistence Interface Connection ........................................................................................ 26
Figure 11: Reference Circuit for RF Antenna Interface ........................................................................... 29
Figure 12: Reference Circuit for RF Antenna Interface (Vehicle Applications) ........................................ 29
Figure 13: Microstrip Design on a 2-layer PCB ...................................................................................... 30
Figure 14: Coplanar Waveguide Design on a 2-layer PCB ..................................................................... 30
Figure 15: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) ................... 30
Figure 16: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) ................... 31
Figure 17: Dimensions of the U.FL-R-SMT Connector (Unit: mm) .......................................................... 32
Figure 18: Mechanicals of U.FL-LP Connectors ..................................................................................... 33
Figure 19: Space Factor of Mated Connector (Unit: mm) ....................................................................... 33
Figure 20: Top and Side Dimensions ..................................................................................................... 41
Figure 21: Bottom Dimensions .............................................................................................................. 42
Figure 22: Recommended Footprint ...................................................................................................... 43
Figure 23: Recommended Stencil Design .............................................................................................. 44
Figure 24: Top View of the Module ......................................................................................................... 45
Figure 25: Bottom View of the Module ................................................................................................... 45
Figure 26: Recommended Reflow Soldering Thermal Profile ................................................................. 47
Figure 27: Tape Dimensions .................................................................................................................. 49
Figure 28: Reel Dimensions .................................................................................................................. 49
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