Product Info

LTE Standard Module Series
EG91 Hardware Design
EG91_Hardware_Design 9 / 96
Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM............................................................................................................. 17
FIGURE 2: PIN ASSIGNMENT (TOP VIEW) .................................................................................................. 20
FIGURE 3: SLEEP MODE APPLICATION VIA UART ..................................................................................... 29
FIGURE 4: SLEEP MODE APPLICATION WITH USB REMOTE WAKEUP ................................................... 30
FIGURE 5: SLEEP MODE APPLICATION WITH RI ....................................................................................... 31
FIGURE 6: SLEEP MODE APPLICATION WITHOUT SUSPEND FUNCTION ............................................... 31
FIGURE 7: POWER SUPPLY LIMITS DURING BURST TRANSMISSION..................................................... 33
FIGURE 8: STAR STRUCTURE OF POWER SUPPLY .................................................................................. 34
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY............................................................................. 34
FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT ............................................................... 35
FIGURE 11: TURN ON THE MODULE USING BUTTON ............................................................................... 36
FIGURE 12: TIMING OF TURNING ON MODULE ......................................................................................... 36
FIGURE 13: TIMING OF TURNING OFF MODULE ....................................................................................... 37
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 38
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ..................................................... 39
FIGURE 16: TIMING OF RESETTING MODULE ........................................................................................... 39
FIGURE 17: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH AN 8-PIN (U)SIM CARD CONNECTOR
............................................................................................................................................................... 41
FIGURE 18: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH A 6-PIN (U)SIM CARD CONNECTOR . 41
FIGURE 19: REFERENCE CIRCUIT OF USB INTERFACE........................................................................... 43
FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP .................................................................. 45
FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT............................................................. 46
FIGURE 22: PRIMARY MODE TIMING .......................................................................................................... 47
FIGURE 23: AUXILIARY MODE TIMING ....................................................................................................... 47
FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ................................... 48
FIGURE 25: REFERENCE CIRCUIT OF SPI INTERFACE WITH PERIPHERALS ........................................ 49
FIGURE 26: REFERENCE CIRCUIT OF NETWORK STATUS INDICATOR .................................................. 50
FIGURE 27: REFERENCE CIRCUIT OF STATUS ......................................................................................... 51
FIGURE 28: REFERENCE CIRCUIT OF USB_BOOT INTERFACE ............................................................... 53
FIGURE 29: TIMING SEQUENCE FOR ENTERING EMERGENCY DOWNLOAD MODE ............................. 54
FIGURE 30: REFERENCE CIRCUIT OF RF ANTENNA INTERFACE ............................................................ 59
FIGURE 31: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB .................................................................... 59
FIGURE 32: COPLANAR WAVEGUIDE DESIGN ON A 2-LAYER PCB.......................................................... 60
FIGURE 33: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)
............................................................................................................................................................... 60
FIGURE 34: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND)
............................................................................................................................................................... 60
FIGURE 35: REFERENCE CIRCUIT OF GNSS ANTENNA ........................................................................... 62
FIGURE 36: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM) ............................................... 63
FIGURE 37: MECHANICALS OF U.FL-LP CONNECTORS ........................................................................... 64
FIGURE 38: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) .......................................................... 64