Uart Port - Quectel M10 Hardware Design

M10 Hardware Design
The Debug Port:
 DBG_TXD: Send data to the COM port of a debugging computer
 DBG_RXD: Receive data from the COM port of a debugging computer
UART3:
 TXD_AUX: Send data to the RXD of DTE
 RXD_AUX: Receive data from the TXD of DTE
The logic levels are described in the following table.
Table 9: Logic levels of the serial interface
Parameter Min
V 0
IL
V 0.75*VDD_EXT
IH
V 0
OL
V 0.85*VDD_EXT
OH
Table 10: Pin definition of the serial interfaces
Interface Name
DBG_RXD
Debug Port
DBG_TXD
RI
RTS
CTS
Serial Port RXD
TXD
DTR
DCD
TXD3
UART3
RXD3

3.8.1. UART Port

3.8.1.1. The features of UART Port.
Seven lines on UART interface:
Contain data lines TXD and RXD, hardware flow control lines RTS and CTS, other control

lines DTR, DCD and RI.
M10_HD_V3.0
Max
0.25*VDD_EXT
VDD_EXT +0.3
0.15*VDD_EXT
VDD_EXT
Pin Function
9 Receive data of the debug port
10 Transmit data of the debug port
55 Ring indicator
58 Request to send
57 Clear to send
61 Receive data of the serial port
60 Transmit data of the serial port
59 Data terminal ready
56 Data carrier detection
62 Transmit data of UART3
63 Receive data of UART3
Unit
V
V
V
V
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