Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design Confidential / Released
8
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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM
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20
FIGURE 2: PIN ASSIGNMENT (TOP VIEW)
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22
FIGURE 3: VOLTAGE DROP SAMPLE
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34
FIGURE 4: STAR STRUCTURE OF THE POWER SUPPLY
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35
FIGURE 5: REFERENCE CIRCUIT OF POWER SUPPLY
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35
FIGURE 6: TURN ON THE MODULE USING DRIVING CIRCUIT
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36
FIGURE 7: TURN ON THE MODULE USING KEYSTROKE
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37
FIGURE 8: TIMING OF TURNING ON MODULE
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37
FIGURE 9: TIMING OF TURNING OFF MODULE
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38
FIGURE 10: RTC POWERED BY COIN CELL
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38
FIGURE 11: RTC POWERED BY CAPACITOR
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39
FIGURE 12: REFERENCE DESIGN FOR BATTERY CHARGING CIRCUIT
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40
FIGURE 13: USB INTERFACE REFERENCE DESIGN (OTG IS NOT SUPPORTED)
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42
FIGURE 14: USB INTERFACE REFERENCE DESIGN (OTG IS SUPPORTED)
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42
FIGURE 15: REFERENCE CIRCUIT WITH LEVEL TRANSLATOR CHIP (FOR UART1)
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44
FIGURE 16: RS232 LEVEL MATCH CIRCUIT (FOR UART1)
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44
FIGURE 17: REFERENCE CIRCUIT FOR (U)SIM INTERFACE WITH AN 8-PIN (U)SIM CARD CONNECTOR
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46
FIGURE 18: REFERENCE CIRCUIT FOR (U)SIM INTERFACE WITH A 6-PIN (U)SIM CARD CONNECTOR46
FIGURE 19: REFERENCE CIRCUIT FOR SD CARD INTERFACE
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48
FIGURE 20: REFERENCE CIRCUIT FOR MOTOR CONNECTION
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53
FIGURE 21: REFERENCE CIRCUIT DESIGN FOR LCM INTERFACE
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54
FIGURE 22: REFERENCE DESIGN FOR BACKLIGHT DIRVING CIRCUIT
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55
FIGURE 23: REFERENCE CIRCUIT DESIGN FOR TP INTERFACE
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56
FIGURE 24: REFERENCE CIRCUIT DESIGN FOR REAR CAMERA INTERFACE
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58
FIGURE 25: REFERENCE CIRCUIT DESIGN FOR FRONT CAMERA INTERFACE
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59
FIGURE 26: REFERENCE CIRCUIT DESIGN FOR MICROPHONE INTERFACE
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63
FIGURE 27: REFERENCE CIRCUIT DESIGN FOR RECEIVER INTERFACE
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63
FIGURE 28: REFERENCE CIRCUIT DESIGN FOR HEADPHONE INTERFACE
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64
FIGURE 29: REFERENCE CIRCUIT DESIGN FOR LOUDSPEAKER INTERFACE
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64
FIGURE 30: REFERENCE CIRCUIT DESIGN FOR EMERGENCY DOWNLOAD INTERFACE
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65
FIGURE 31: REFERENCE CIRCUIT DESIGN FOR MAIN AND RX-DIVERSITY ANTENNA INTERFACES
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74
FIGURE 32: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB
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75
FIGURE 33: COPLANAR WAVEGUIDE LINE DESIGN ON A 2-LAYER PCB
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75
FIGURE 34: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE
GROUND)
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75
FIGURE 35: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE
GROUND)
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76
FIGURE 36: REFERENCE CIRCUIT DESIGN FOR Wi-Fi/BT ANTENNA
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77
FIGURE 37: REFERENCE CIRCUIT DESIGN FOR GNSS PASSIVE ANTENNA
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78
FIGURE 38: REFERENCE CIRCUIT DESIGN FOR GNSS ACTIVE ANTENNA
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79