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The reset timing is illustrated in the following figure.
RESET_N
VDD_EXT
Module Status
3.8. UART Interfaces
The module provides three UART interfaces: one main UART, one debug UART and one auxiliary UART*.
The module is designed as DCE (Data Communication Equipment), following the traditional DCE-DTE
(Data Terminal Equipment) connection.
Table 12: Pin Definition of UART Interfaces
Interface
Pin Name
MAIN_RXD
Main UART
MAIN_TXD
DBG_RXD
Debug UART
DBG_TXD
AUX_RXD
Auxiliary UART*
AUX_TXD
Ring Indication
RI
BC65_Hardware_Design
VBAT
> 900 ms
Running
Figure 13: Reset Timing
Pin No.
18
17
38
39
28
29
20
≥ 1 s
Resetting
Description
Main UART receive
Main UART transmit
Debug UART receive
Debug UART transmit
Auxiliary UART receive
Auxiliary UART transmit
Ring indication signal (when there is
an SMS or URC output, the module
will inform DTE with RI pin)
NB-IoT Module Series
BC65 Hardware Design
Restart
Comment
1.8 V power
domain
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