Quectel L76 Hardware Design

GNSS Module Series
L76&L76-L_Hardware_Design 9 / 59
Figure Index
Figure 1: Block Diagram ............................................................................................................................. 14
Figure 2: Pin Assignment ........................................................................................................................... 18
Figure 3: Internal Power Supply ................................................................................................................. 22
Figure 4: VCC Input Reference Circuit ...................................................................................................... 23
Figure 5: RTC Powered by Non-rechargeable Battery .............................................................................. 23
Figure 6: Reference Charging Circuit for a Rechargeable Battery ............................................................ 24
Figure 7: Enter/Exit from Backup Mode Sequence ................................................................................... 26
Figure 8: Periodic Mode ............................................................................................................................. 27
Figure 9: AlwaysLocate™ Mode ................................................................................................................ 28
Figure 10: Power-Up Sequence ................................................................................................................. 29
Figure 11: Power-Down Sequence ............................................................................................................ 30
Figure 12: UART Interface Reference Design ........................................................................................... 31
Figure 13: RS-232 Level Shift Circuit ......................................................................................................... 32
Figure 14: I2C Interface Reference Design for L76-L Module ................................................................... 33
Figure 15: 1PPS & NMEA Timing .............................................................................................................. 34
Figure 16: Reference OC Circuit for Module Reset ................................................................................... 34
Figure 17: Reset Sequence ....................................................................................................................... 35
Figure 18: Recommended Footprint .......................................................................................................... 36
Figure 19: Active Antenna Reference Design without ANTON ................................................................. 38
Figure 20: Reference Design for Active Antenna with ANTON ................................................................. 39
Figure 21: Passive Antenna Reference Design without Additional LNA ................................................... 40
Figure 22: Reference Design for Passive Antenna with Additional LNA ................................................... 41
Figure 23: In-Band Interference on GPS L1 .............................................................................................. 42
Figure 24: Out-of-Band Interference on GPS L1 ....................................................................................... 43
Figure 25: Interference Source and Its Path .............................................................................................. 44
Figure 26: Top, Side and Bottom View Dimensions .................................................................................. 48
Figure 27: Top and Bottom Views .............................................................................................................. 49
Figure 28: Tape and Reel Specifications ................................................................................................... 50
Figure 29: Recommended Reflow Soldering Thermal Profile ................................................................... 53
Figure 30: Labelling Information ................................................................................................................ 55

Quectel L76 Specifications

General

Brand	Quectel
Model	L76
Category	Motherboard
Language	English