LPM2100 mg NB Module Hardware User Guide
Shanghai Yuge Information Technology Co., Ltd.
- 20 -
28
RXD_AUX
DI
Data reception
IO voltage domain
29
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 3-6 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
3.5.1Serial application circuit
If you need to use a 4-wire serial port, you can refer to the following connection
methods.
Figure 3-10 Full-featured serial port design
If you need to use a 2-wire serial port, you can refer to the following serial port design.
Figure 3-11 UART serial port design
