Yuga NB module hardware manual V1.01

LPM2100 mg NB module hardware manual
Shang Hai YUGE Information Technology co., LTD
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Debug serial port can upgrade firmware, check log information and so on.
Module serial port baud rate can be set 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800, 921600 BPS baud rate, the default is 57600 bps.
Table 3-6 definition of serial pin
Pin
Pin name
IO
Functional description
Remarks
18
TXD
DO
Master data transmission
2.8V voltage domain
20
RI
DO
Ringing hints
2.8V voltage domain
22
CTS
DO
Scavenging sending
2.8V voltage domain
23
RTS
DI
Request to send
2.8V voltage domain
28
UART2_RXD
DI
UART2 data reception
2.8V voltage domain
29
UART2_TXD
DO
UART2 data transmission
2.8V voltage domain
38
RXD_DBG
DI
Module debug data receiving
Debug UART
39
TXD_DBG
DO
Module debug data transmission
Debug UART
Table 3-7 serial port logic level
Parameter
Minimum
Maximum
Unit
VIL
0
0.3*VDD_EXT
V
VIH
0.7*VDD_EXT
VDD_EXT
V
VOL
0
0.3*VDD_EXT
V
VOH
0.7*VDD_EXT
VDD_EXT
V
3.6.1 Serial port application circuit
When users want to use the full function serial port, you can refer to the following
connection mode.
Figure 3-8 full function serial port design diagram