Hardware Design V1.0

NB-IoT Module Series
BC95 Hardware Design
BC95_Hardware_Design Confidential / Released 22 / 45
The debug port:
 DBG_TXD: Send data to the COM port of computer.
 DBG_RXD: Receive data from the COM port of computer.
The logic levels are described in the following table.
Table 9: Pin Definition of the UART Interfaces
Table 10: Logic Levels of the UART Interfaces
3.8.1. Main Port
Main port can be used for AT command communication and data transmission. The baud rate is 9600bps.
When main port is applied in modulation-demodulation, a reference design for main port connection is
shown as below.
Interfaces
Pin No.
Pin Name
Description
Comment
Debug Port
19
DBG_RXD
Receive data
3.0V power domain
20
DBG_TXD
Transmit data
3.0V power domain
Main Port
29
RXD
Receive data
3.0V power domain
30
TXD
Transmit data
3.0V power domain
34
RI
Ring indicator
3.0V power domain
Parameter
Min.
Max.
Unit
V
IL
-0.1 × VDD_EXT
0.2 × VDD_EXT
V
V
IH
0.7×VDD_EXT
1.1×VDD_EXT
V
V
OL
0.4
V
V
OH
2.4
VDD_EXT
V
Quectel
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