Product Info

Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 53 / 129
3.11. UART Interfaces
The module provides three UART interfaces: main UART interface, UART2 interface and debug UART
interface. The following are the features of these UART interfaces.
 The main UART interface supports 9600bps, 19200bps, 38400bps, 57600bps, 115200bps,
230400bps, 460800bps and 921600bps baud rates, and the default is 115200bps. The interface is
used for data transmission and AT command communication.
 The UART2 interface supports 9600bps, 19200bps, 38400bps, 57600bps, 115200bps, 230400bps,
460800bps and 921600bps baud rates, and the default is 115200bps. The interface is designed for
BT function*.
 The debug UART interface supports 115200bps baud rate. It is used for Linux console and log
output.
The following tables show the pin definition of the three UART interfaces.
Table 12: Pin Definition of Main UART Interface
Pin Name
Pin No.
I/O
Description
Comment
UART1_RI
61
DO
Ring indicator
1.8V power domain
UART1_DCD
59
DO
Data carrier detection
1.8V power domain
UART1_CTS
56
DO
Clear to send
1.8V power domain
UART1_RTS
57
DI
Request to send
1.8V power domain
UART1_DTR
62
DI
Sleep mode control
1.8V power domain
UART1_TXD
60
DO
Transmit data
1.8V power domain
UART1_RXD
58
DI
Receive data
1.8V power domain
Table 13: Pin Definition of UART2 Interface (for BT Function*)
Pin Name
Pin No.
I/O
Description
Comment
UART2_TXD
163
DO
Transmit data
1.8V power domain
UART2_CTS
164
DO
Clear to send
1.8V power domain
UART2_RXD
165
DI
Receive data
1.8V power domain