Product Info

Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 57 / 118
The following table shows the pin definition of UART interfaces.
Table 16: Pin Definition of UART Interfaces
UART6 is a 4-wire UART interface with 1.8V power domain. A level translator chip should be used if
customers’ application is equipped with a 3.3V UART interface. A level translator chip TXS0104EPWR
provided by Texas Instruments is recommended.
The following figure shows a reference design.
Pin Name
Pin No.
I/O
Description
Comment
DEBUG_TXD
5
DO
UART for Debug
1.8 power domain
DEBUG_RXD
6
DI
1.8 power domain
UART1_TXD
7
DO
UART1
1.8 power domain
UART1_RXD
8
DI
1.8 power domain
UART6_RXD
198
DI
UART6 Receive data
1.8 power domain
UART6_TXD
199
DO
UART6 Send data
1.8 power domain
UART6_CTS
246
DI
UART6 Clear sending
1.8 power domain
UART6_RTS
245
DO
UART6 Request sending
1.8 power domain
LPI_UART_2_
TXD
60
DO
UART2 Send data
1.8 power domain
LPI_UART_2_
RXD
61
DI
UART2 Receive data
1.8 power domain