Uart Interfaces - Quectel SC200L-EM Hardware Design

3.9. UART Interfaces

SC200L provides two UART interfaces:
 UART0: 4-wire UART interface, hardware flow control supported.
 UART1（DEBUG）: 2-wire UART interface; used for debugging by default.
The UART interface pin definition is as follows:
Table 10: Pin Definition of UART Interfaces
Pin Name Pin No
UART0_TXD 34
UART0_RXD 35
UART0_CTS 36
UART0_RTS 37
DBG_RXD 93
DBG_TXD 94
UART0 is a 4-wire UART interface with 1.85V power domain. A level translator should be used if
customers' application is equipped with a 3.3V UART interface.
Figure 12: Reference Circuit with Level Translator Chip (for UART5)
The following figure is an example of a connection between SC200L and PC. A voltage level translator
and an RS-232 level translator chip are also recommended to be added between the module and PC. The
SC200L_Hardware_Design
I/O Description
DO UART0 transmit data
DI UART0 receive data
DI UART0 clear to send
DO UART0 request to send
UART1 receive data.
DI
Debug port by default.
UART2 transmit data.
DO
Debug port by default.
SC200L Hardware Design
Comment
1.8V power domain.
If unused, keep it open.
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