Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 10 / 112
Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 23
FIGURE 2: PIN ASSIGNMENT (TOP VIEW) .................................................................................................... 25
FIGURE 3: SLEEP MODE APPLICATION VIA UART ...................................................................................... 39
FIGURE 4: SLEEP MODE APPLICATION WITH USB REMOTE WAKEUP .................................................... 40
FIGURE 5: SLEEP MODE APPLICATION WITH RI ......................................................................................... 40
FIGURE 6: SLEEP MODE APPLICATION WITHOUT SUSPEND FUNCTION ................................................ 41
FIGURE 7: POWER SUPPLY LIMITS DURING BURST TRANSMISSION ..................................................... 43
FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY ........................................................................... 43
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 44
FIGURE 10: TURN ON THE MODULE BY USING DRIVING CIRCUIT ........................................................... 45
FIGURE 11: TURN ON THE MODULE BY USING BUTTON ........................................................................... 45
FIGURE 12: TIMING OF TURNING ON MODULE ........................................................................................... 46
FIGURE 13: TIMING OF TURNING OFF MODULE ......................................................................................... 47
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 48
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 48
FIGURE 16: TIMING OF RESETTING MODULE ............................................................................................. 48
FIGURE 17: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH AN 8-PIN (U)SIM CARD CONNECTOR
................................................................................................................................................................... 50
FIGURE 18: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH A 6-PIN (U)SIM CARD CONNECTOR 50
FIGURE 19: REFERENCE CIRCUIT OF USB APPLICATION ......................................................................... 52
FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP ................................................................... 54
FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 55
FIGURE 22: PRIMARY MODE TIMING ............................................................................................................ 56
FIGURE 23: AUXILIARY MODE TIMING .......................................................................................................... 56
FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ................................... 57
FIGURE 25: REFERENCE CIRCUIT OF SD CARD ......................................................................................... 59
FIGURE 26: REFERENCE CIRCUIT OF THE NETWORK INDICATOR ......................................................... 62
FIGURE 27: REFERENCE CIRCUITS OF STATUS ........................................................................................ 63
FIGURE 28: SIMPLIFIED BLOCK DIAGRAM FOR ETHERNET APPLICATION ............................................. 65
FIGURE 29: REFERENCE CIRCUIT OF SGMII INTERFACE WITH PHY AR8033 APPLICATION ................ 65
FIGURE 30: REFERENCE CIRCUIT OF WIRELESS CONNECTIVITY INTERFACES WITH FC20 MODULE
................................................................................................................................................................... 67
FIGURE 31: REFERENCE CIRCUIT OF USB_BOOT INTERFACE ................................................................ 69
FIGURE 32: REFERENCE CIRCUIT OF RF ANTENNA INTERFACE ............................................................ 74
FIGURE 33: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB ..................................................................... 75
FIGURE 34: COPLANAR WAVEGUIDE LINE DESIGN ON A 2-LAYER PCB ................................................. 75
FIGURE 35: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE
GROUND) .................................................................................................................................................. 75
FIGURE 36: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE
GROUND) .................................................................................................................................................. 76
FIGURE 37: REFERENCE CIRCUIT OF GNSS ANTENNA ............................................................................. 77