Quectel M10, Hardware Design

Page: 41 / 81

M10 Hardware Design
M10_HD_V3.0 - 40 -
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
Table 10: Pin definition of the serial interfaces
Interface Name Pin Function
Debug Port
DBG_RXD 9 Receive data of the debug port
DBG_TXD 10 Transmit data of the debug port
Serial Port
RI 55 Ring indicator
RTS 58 Request to send
CTS 57 Clear to send
RXD 61 Receive data of the serial port
TXD 60 Transmit data of the serial port
DTR 59 Data terminal ready
DCD 56 Data carrier detection
UART3
TXD3 62 Transmit data of UART3
RXD3 63 Receive data of UART3
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.
Parameter Min Max Unit
V
IL
0 0.25*VDD_EXT V
V
IH
0.75*VDD_EXT VDD_EXT +0.3 V
V
OL
0 0.15*VDD_EXT V
V
OH
0.85*VDD_EXT VDD_EXT V