Quectel EG91 Series Hardware Design page 14

Figure Index
Figure 1: Functional Diagram
Figure 2: Pin Assignment (Top
Figure 3: Sleep Mode Application via
Figure 4: Sleep Mode Application with USB Remote
Figure 5: Sleep Mode Application with
Figure 6: Sleep Mode Application without Suspend
Figure 7: Power Supply Limits during Burst
Figure 8: Star Structure of Power
Figure 9: Reference Circuit of Power
Figure 10: Turn on the Module Using Driving
Figure 11: Turn on the Module Using A
Figure 12: Power-up Timing.....................................................................................................................................40
Figure 13: Power-down
Figure 14: Reference Circuit of RESET_N by Using Driving
Figure 15: Reference Circuit of RESET_N by Using A
Figure 16: Timing of Resetting the
Figure 17: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card
Figure 18: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card
Figure 19: Reference Circuit of USB
Figure 20: Reference Circuit with Translator
Figure 21: Reference Circuit with Transistor
Figure 22: Primary Mode
Figure 23: Auxiliary Mode
Figure 24: Reference Circuit of PCM Application with Audio
Figure 25: Reference Circuit of SPI Interface with
Figure 26: Reference Circuit of Network Status
Figure 27: Reference Circuit of
Figure 28: Reference Circuit of USB_BOOT
Figure 29: Emergency Download Mode
Figure 30: Reference Circuit of RF Antenna
Figure 31: Reference Circuit of GNSS
Figure 32: Microstrip Design on a 2-layer
Figure 33: Coplanar Waveguide Design on a 2-layer
Figure 34: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference
Figure 35: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference
Figure 36: Dimensions of the U.FL-R-SMT Connector (Unit:
Figure 37: Mechanicals of U.FL-LP
Figure 38: Space Factor of Mated Connector (Unit:
Figure 39: Referenced Heatsink Design (Heatsink at the Top of the
Figure 40: Referenced Heatsink Design (Heatsink at the Backside of Customers'
Figure 41: Module Top and Side
EG91_Series_Hardware_Design
................................................................................................................................ 22
View)..................................................................................................................... 24
UART.........................................................................................................33
RI..............................................................................................................34
Transmission.................................................................................37
Supply..............................................................................................................37
Supply....................................................................................................... 38
Circuit.......................................................................................... 39
Button.....................................................................................................39
Timing............................................................................................................................... 41
Module........................................................................................................... 43
Interface..................................................................................................... 46
Chip............................................................................................... 48
Circuit............................................................................................ 49
Timing.............................................................................................................................50
Timing............................................................................................................................50
STATUS...............................................................................................................54
Interface....................................................................................... 56
Timing................................................................................................... 57
Interface........................................................................................ 62
Antenna...................................................................................................63
PCB....................................................................................................64
Connectors.................................................................................................. 67
Dimensions.......................................................................................................92
Wakeup.......................................................................... 33
Function........................................................................... 35
Circuit................................................................ 42
Button...........................................................................42
Codec................................................................ 51
Peripherals......................................................................... 52
Indication................................................................................ 53
PCB................................................................................64
mm)................................................................... 67
mm).................................................................................. 68
Module)................................................90
LTE Standard Module Series
Connector............................. 44
Connector............................... 45
Ground).......................65
Ground).......................65
PCB)............................ 90
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