LPM2100 bg NB Module Hardware Usage Guide
Shanghai Yuge Information Technology Co., Ltd.
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Symbol
Description
Min
Typical
Max
unit
Treset
Low pulse width
100
600
ms
VIH
RESET input high level voltage
0.68
1.07
1.41
V
VIL
RESET input low level voltage
-0.3
0
0.68
V
Figure 3-7 Reset timing diagram
The LPM2100 bg series module supports AT command reset, and the AT command
AT+TRB can be used to restart the module. Detailed instructions can be found in the
"RDA_AT Command Manual" provided by the domain.
3.5 UART interface
The LPM2100 bg series modules provide three sets of UART interfaces. Main serial port,
debug serial port, auxiliary serial port. The serial port level is the IO output level value. The
module is a DCE (Data Communication Equipment) device.
The main serial port can realize AT interactive instructions and peripheral data
interaction.
Debug the serial port to upgrade the firmware, view log information, and so on.
The module serial port baud rate can be set to 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800, 921600bps baud rate, the default is 57600bps.
Table 3-6 Serial port pin definitions
Pin
Pin name
IO
Functional description
Remarks
Main serial interface
29
RXD
DI
Master data reception
IO voltage domain
30
TXD
DO
Master data transmission
IO voltage domain
