Quectel BG95 Manual page 33

BG95 BG96
MAIN_RI RI
MAIN_DCD DCD
CTS
MAIN_CTS
RTS
MAIN_RTS MAIN_RTS
MAIN_DTR MAIN_DTR MAIN_DTR MAIN_DTR DTR
MAIN_TXD TXD
MAIN_RXD
RXD
Another example with transistor translation circuit is shown as below. For the design of circuits in dotted
lines, please refer to that of circuits in solid lines, but please pay attention to the direction of connection.
MCU/ARM

NOTE
Transistor circuit solution is not suitable for applications with high baud rates exceeding 460Kbps.
BG95&BG96_Compatible_Design
VDD_EXT
0.1uF
120K
51K
Figure 15: Reference Circuit with Translator Chip
4.7K
VDD_EXT
TXD
RXD
1nF
10K
VCC_MCU
4.7K
RTS
CTS
GPIO
EINT
GPIO
GND
Figure 16: Reference Circuit with Transistor Circuit
VCCA VCCB
OE GND
A1
A2
Translator
A3
A4
A5
A6
A7
A8
VDD_EXT
1nF
10K
VDD_EXT
LPWA Module Series
BG95&BG96 Compatible Design
0.1uF
B1
B2
DCD_MCU
B3
B4
B5
B6
B7
51K
B8
Module
BG95 BG96
MAIN_RXD
RXD
MAIN_TXD TXD
MAIN_RTS RTS
MAIN_CTS
CTS
MAIN_DTR
DTR
MAIN_RI
RI
MAIN_DCD DCD
GND GND
VDD_MCU
RI_MCU
CTS_MCU
RTS_MCU
DTR_MCU
TXD_MCU
RXD_MCU
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