NB-IoT Module Series
BC95 Hardware Design
BC95_Hardware_Design Confidential / Released 23 / 51
The debug port:
DBG_TXD: Send data to the COM port of computer.
DBG_RXD: Receive data from the COM port of computer.
“*” means under development.
The logic levels are described in the following table.
Table 8: Pin Definition of the UART Interfaces
Table 9: Logic Levels of the UART Interfaces
3.8.1. Main Port
Main port can be used for AT command communication and data transmission, and the baud rate is
9600bps. It can also be used for firmware upgrading through Universal Code Loader or Code Loader tool,
and the baud rate for firmware upgrading is 115200bps. This main port is available in active mode, idle
mode and PSM. For details, please refer to
document [2] & [3]
.
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
NOTE
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