Quectel L76

GNSS Module Series
L76&L76-L_Hardware_Design 31 / 59
4 Application Interfaces
4.1. I/O Pins
4.1.1. Communication Interfaces
The following interfaces can be used for data reception and transmission.
4.1.1.1. UART Interface
The three modules all provide one UART interface. The UART port has the following features:
⚫ Support for firmware upgrade, NMEA output and PMTK/PQ proprietary messages input.
⚫ Supported baud rates: 4800, 9600, 14400, 19200, 38400, 57600, 115200, 230400, 460800, and
921600 bps.
⚫ Default settings: 9600 bps, 8 bits, no parity bit, 1 stop bit.
⚫ Hardware flow control and synchronous operation are not supported.
A reference design is shown in the figure below.
Module
TXD
RXD
GND
Customer
TXD
RXD
GND
Figure 12: UART Interface Reference Design
If the IO voltage of MCU is not matched with that of the modules, a level shifter must be selected.
NOTE