LPM2100 bg NB Module Hardware Usage Guide
Shanghai Yuge Information Technology Co., Ltd.
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Debug serial interface
19
DBG_RXD
DI
Module debug data
reception
Debug serial port
20
DBG_TXD
DO
Module debug data
transmission
Debug serial port
Secondary serial interface
27
RXD_AUX
DI
Data reception
IO voltage domain
28
TXD_AUX
DO
Data transmission
IO voltage domain
22
CTS_AUX
DI
Request to send
IO voltage domain
23
RTS_AUX
DO
Clear send
IO voltage domain
Table 3-7 Serial port logic levels
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
3.5.1 Serial application circuit
If you need to use a 4-wire serial port, you can refer to the following connection
methods:
Figure 3-8 Full-featured serial port design
If you need to use a 2-wire serial port, you can refer to the following serial port design.
