NB-IoT Module Series
BC66 Hardware Design
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RESET
S1
Close to S1
TVS
Figure 10: Reference Circuit of RESET by Using Button
The reset scenario is illustrated in the following figure.
VBAT
TBD
Resetting
Module
Status
Running
RESET
Restart
TBD
VDD_EXT
············
Figure 11: Reset Timing
3.8. UART Interfaces
The module provides three UART ports: main UART port, debug UART port and auxiliary UART port. The
module is designed as DCE (Data Communication Equipment), following the traditional DCE-DTE (Data
Terminal Equipment) connection.
Main UART Port:
TXD: Send data to RXD of DTE.
RXD: Receive data from TXD of DTE.
