Quectel LC79D

GNSS Module Series
LC79D Hardware Design
LC79D_Hardware_Design 6 / 42
Figure Index
FIGURE 1: BLOCK DIAGRAM .......................................................................................................................... 12
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 14
FIGURE 3: VCC INPUT REFERENCE CIRCUIT .............................................................................................. 18
FIGURE 4: INTERNAL POWER SYSTEM CONSTRUCTION .......................................................................... 19
FIGURE 5: REFERENCE CIRCUIT FOR NSTANDBY ..................................................................................... 21
FIGURE 6: REFERENCE DESIGN OF UART INTERFACE............................................................................. 22
FIGURE 7: REFERENCE DESIGN OF SPI INTERFACE................................................................................. 23
FIGURE 8: BOOT PIN STATE (NORMAL WORKING MODE) ......................................................................... 24
FIGURE 9: BOOT PIN CONTROL SEQUENCE (HOST MODE) ..................................................................... 24
FIGURE 10: REFERENCE DESIGN FOR ACTIVE ANTENNA ........................................................................ 28
FIGURE 11: REFERENCE DESIGN FOR PASSIVE ANTENNA ..................................................................... 28
FIGURE 12: TOP AND SIDE DIMENSIONS ..................................................................................................... 33
FIGURE 13: BOTTOM DIMENSIONS ............................................................................................................... 34
FIGURE 14: RECOMMENDED FOOTPRINT ................................................................................................... 35
FIGURE 15: TOP VIEW OF THE MODULE ...................................................................................................... 36
FIGURE 16: BOTTOM VIEW OF THE MODULE .............................................................................................. 36
FIGURE 17: RECOMMENDED REFLOW SOLDERING THERMAL PROFILE ............................................... 38
FIGURE 18: TAPE AND REEL SPECIFICATIONS .......................................................................................... 40