Uart Interfaces - Quectel BC66 Hardware Design

VDD_EXT
Module
Status

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.
Table 9: Pin Definition of UART Interfaces
Interface
Main UART Port
Debug UART Port
Auxiliary UART Port
Ringing Signal
BC66_Hardware_Design
VBAT
20ms
RESET
Running
Figure 13: Reset Timing
Pin Name Pin No.
TXD 17
RXD 18
RXD_DBG 38
TXD_DBG 39
RXD_AUX 28
TXD_AUX 29
RI* 20
≥50ms
· · · · · · · · · · · ·
Resetting
Description
Send data to RXD of DTE
Receive data from TXD of DTE
Send data to RXD of DTE
Receive data from TXD of DTE
Send data to RXD of DTE
Receive data from TXD of DTE
Ring indicator (when there is a SMS
or URC output, the module will inform
DTE with the RI* pin)
NB-IoT Module Series
BC66 Hardware Design
Restart
Comment
1.8V power
domain
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