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design.
LDO5_1V8
UART5_CTS
UART5_RTS
UART5_TXD
UART5_RXD
Figure 14: Reference Circuit with Voltage Level Translator Chip (for UART5)
The following figure is an example of connection between the module and PC. It is recommended to add
a level translator and an RS-232 level translator chip between the module and PC. The following figure
shows the reference design.
1.8 V
UART5_TXD
UART5_RTS
UART5_RXD
UART5_RXD
UART5_CTS
GND
Module
NOTE
UART2 and UART1 are similar to UART5. For the reference design, refer to that of UART5.
SC262R_Series_Hardware_Design
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 15: RS-232 Level Match Circuit (for UART5)
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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