Product Info

LPWA Module Series
BG600L-M3 Hardware Design
BG600L-M3_Hardware_Design 43 / 83
 Junction capacitance of the ESD protection device might cause influences on USB data lines, so
please pay attention to the selection of the device. Typically, the stray capacitance should be less
than 2 pF.
 Keep the ESD protection devices as close to the USB connector as possible.
1. BG600L-M3 can only be used as a slave device.
2. The input voltage range of USB_VBUS is 1.3–1.8 V.
2.11 UART Interfaces
The module provides three UART interfaces: the main UART, debug UART and the GNSS UART
interfaces. Features of them are illustrated below:
 The main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800 and
921600 bps baud rates, and the default is 115200 bps. It is used for data transmission and AT
command communication, and supports hardware flow control. The default frame format is 8N1 (8
data bits, no parity, 1 stop bit).
 The debug UART interface supports a fixed baud rate of 115200 bps, and is used for software
debugging and log output.
 The GNSS UART interface supports 115200 bps baud rate by default, and is used for GNSS data
and NMEA sentences output.
The following tables show the pin definition of the three UART interfaces.
Table 12: Pin Definition of Main UART Interface
Pin Name Pin No. I/O Description Comment
MAIN_DTR 37 DI Main UART data terminal ready 1.8 V power domain
MAIN_RXD 34 DI Main UART receive 1.8 V power domain
MAIN_TXD 33 DO Main UART transmit 1.8 V power domain
MAIN_CTS 38 DO Main UART clear to send 1.8 V power domain
MAIN_RTS 39 DI Main UART request to send 1.8 V power domain
MAIN_DCD 36 DO Main UART data carrier detect 1.8 V power domain
NOTES