SimCom SIM7020C Hardware Design page 6

Figure 1: SIM7020 block diagram ..............................................................................................8
Figure 2: Pin assignment overview ...........................................................................................10
Figure 3: Dimensions (Unit: mm) .............................................................................................14
Figure 4: Footprint recommendation (Unit: mm) .....................................................................15
Figure 5: Power supply application circuit ...............................................................................17
Figure 6: Reference power on/off circuit ..................................................................................18
Figure 7: Power on timing sequence .........................................................................................18
Figure 8: Power off timing sequence ........................................................................................19
Figure 9: Reference reset circuit ...............................................................................................20
Figure 10: UART full modem ...................................................................................................21
Figure 11: UART null modem ..................................................................................................21
Figure 12: Reference circuit of level shift ................................................................................22
Figure 13: TX level matching circuit ........................................................................................22
Figure 14: RX level matching circuit ........................................................................................22
Figure 15: RI behaviour （SMS and URC report） .................................................................23
Figure 16: USB reference circuit ..............................................................................................23
Figure 17: SIM interface reference circuit ................................................................................25
Figure 18: Amphenol SIM card socket .....................................................................................25
Figure 19: NETLIGHT reference circuit ..................................................................................26
Figure 20：Power on sequence of the VDD_EXT ...................................................................27
Figure 21：Power on sequence of the VDD_3V3 ....................................................................27
Figure 22: Antenna matching circuit (MAIN_ANT) ................................................................31
Figure 23: RF trace should be far away from other high speed signal lines .............................32
Figure 24: The distance between GND to the inner conductor of SMA ...................................32
Figure 25: Top and bottom view of SIM7020 ...........................................................................39
Figure 26: The ramp-soak-spike reflow profile of SIM7020 ....................................................39
Figure 27: Recommended SMT stencil footprint outline ..........................................................41
Figure 28: packaging diagram ..................................................................................................42
Figure 29: Tray drawing............................................................................................................42
Figure 30: Small carton drawing ...............................................................................................43
Figure 31: Big carton drawing ..................................................................................................43
SIM7020_Hardware_Design_V1.02
Figure Index
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Smart Machine Smart Decision
2018-07-25