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UART0_RTS
37
UART0_CTS
36
DBG_TXD
94
DBG_RXD
93
UART1_TXD
154
UART1_RXD
153
UART0 is a four-wire UART interface with 1.8 V power domain. You should use a level translator if your
application is equipped with a 3.3 V UART interface. The following figure shows a reference design.
LDO15A_1V8
UART0_CTS
UART0_RTS
UART0_TXD
UART0_RXD
Figure 13: Reference Circuit with Level Translator Chip for UART0
The following figure presents an example of connection between the module and a PC. It is
recommended to add a level translator and an RS-232 level translator chip between the module and the
PC.
1.8 V
UART0_TXD
UART0_RTS
UART0_RXD
UART0_CTS
GND
Module
SC206E_Series_Hardware_Design
DO
DCE request to send signal to DTE
DI
DCE clear to send signal from DTE
DO
Debug UART transmit
DI
Debug UART receive
DO
UART1 transmit
DI
UART1 receive
VCCA
C1
100 pF
OE
A1
A2
A3
A4
OE
VCCA
VCCB
TXD_3.3V
TXD_1.8V
RTS_1.8V
RTS_3.3V
RXD_1.8V
RXD_3.3V
CTS_1.8V
CTS_3.3V
GND
Figure 14: RS-232 Level Match Circuit for UART0
VCCB
C2
100 pF
U1
GND
B1
B2
B3
B4
3.3 V
VCC
DIN1
DIN2
DIN3
DIN4
DIN5
R1OUTB
ROUT1
ROUT2
ROUT3
FORCEON
/INVALID
3.3 V
/FORCEOFF
Smart Module Series
VDD_3.3V
CTS_3.3V
RTS_3.3V
TXD_3.3V
RXD_3.3V
GND
GND
DOUT1
RXD
DOUT2
CTS
DOUT3
DOUT4
DOUT5
TXD
RIN1
RIN2
RTS
RIN3
DB-9
46 / 115
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