Quectel SC262R Series, Hardware Design

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Smart Module Series
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Figure Index
Figure 1: Functional Diagram ..................................................................................................................... 19
Figure 2: Pin Assignment (Top View) ......................................................................................................... 21
Figure 3: Power Supply Limits during Burst Transmission ........................................................................ 36
Figure 4: Star Structure of the Power Supply ............................................................................................ 37
Figure 5: Reference Circuit of Power Supply ............................................................................................. 37
Figure 6: Turn On the Module Using Driving Circuit .................................................................................. 38
Figure 7: Turn On the Module Using Button .............................................................................................. 38
Figure 8: Timing of Turning On the Module ............................................................................................... 39
Figure 9: Timing of Turning Off the Module ................................................................................................ 40
Figure 10: RTC Powered by Coin Cell ....................................................................................................... 40
Figure 11: Reference Design for Battery Charging Circuit ........................................................................ 42
Figure 12: USB Interface Reference Design (OTG Not Supported) .......................................................... 44
Figure 13: USB Interface Reference Design (OTG Supported) ................................................................ 44
Figure 14: Reference Circuit with Voltage Level Translator Chip (for UART5) ......................................... 46
Figure 15: RS-232 Level Match Circuit (for UART5) ................................................................................. 46
Figure 16: Reference Circuit for (U)SIM Interface with an 8-pin (U)SIM Card Connector ........................ 48
Figure 17: Reference Circuit for (U)SIM Interface with a 6-pin (U)SIM Card Connector .......................... 48
Figure 18: Reference Circuit for SD Card Interface ................................................................................... 50
Figure 19: Reference Circuit for Motor Connection ................................................................................... 56
Figure 20: Reference Circuit Design for LCM Interface ............................................................................. 58
Figure 21: Reference Design for External Backlight Driving Circuit .......................................................... 59
Figure 22: Reference Circuit Design for TP Interface ................................................................................ 60
Figure 23: Reference Circuit Design for 3-Camera Applications ............................................................... 63
Figure 24: Reference Circuit Design for ECM Microphone Interface ........................................................ 67
Figure 25: Reference Circuit Design for MEMS Microphone Interface ..................................................... 68
Figure 26: Reference Circuit Design for Earpiece Interface ...................................................................... 68
Figure 27: Reference Circuit Design for Headset Interface ....................................................................... 68
Figure 28: Reference Circuit Design for Loudspeaker Interface ............................................................... 69
Figure 29: Reference Circuit Design for USB_BOOT Control Interface .................................................... 70
Figure 30: Reference Circuit Design for Main and Rx-diversity Antenna Interfaces ................................. 80
Figure 31: Reference Circuit Design for Wi-Fi/Bluetooth Antenna ............................................................ 81
Figure 32: Reference Circuit Design for GNSS Passive Antenna ............................................................. 82
Figure 33: Reference Circuit Design for GNSS Active Antenna ................................................................ 83
Figure 34: Microstrip Design on a 2-layer PCB ......................................................................................... 83
Figure 35: Coplanar Waveguide Design on a 2-layer PCB ....................................................................... 84
Figure 36: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) .................... 84
Figure 37: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) .................... 84
Figure 38: Dimensions of the Receptacle (Unit: mm) ................................................................................ 86
Figure 39: Specifications of Mated Plugs .................................................................................................. 87
Figure 40: Space Factor of Mated Connectors (Unit: mm) ........................................................................ 87
Figure 41: Top and Side Dimensions ......................................................................................................... 99