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Table 12: Pin Definition of UART Interfaces
Pin Name
DBG_TXD
DBG_RXD
UART0_TXD
UART0_RXD
UART0_CTS
UART0_RTS
UART2_TXD
UART2_RXD
The three UART interfaces of the module are 1.85 V. A level translator chip should be used if the module
connects with a 3.3 V UART interface. A level translator TXS0104EPWR provided by Texas Instruments
is recommended. The following figure shows a corresponding reference design.
VDD1V85
UART0_CTS
UART0_RTS
UART0_TXD
UART0_RXD
Figure 16: Reference Circuit of Level Translator Chip (For UART0)
When the module communicates with PC, level translation is also required. A level translator chip and an
RS-232 translator chip are recommended to be added. The following figure shows a corresponding
reference design.
SC200K_Series_Hardware_Design
Pin No.
I/O
94
DO
93
DI
34
DO
35
DI
36
DI
37
DO
154
DO
153
DI
VCCA
C1
100 pF
OE
A1
A2
A3
A4
Description
Debug UART transmit
Debug UART receive
UART0 transmit
UART0 receive
DCE clear to send
DCE request to send
UART2 transmit
UART2 receive
VCCB
U1
GND
B1
B2
TXS0104EPWR
B3
B4
Smart Module Series
Comment
1.85 V power domain.
If unused, keep it open.
Dot not pull DBG_TXD
down when turning on the
module.
1.85 V power domain.
If unused, keep it open.
VDD_3.3V
C2
100 pF
CTS_3.3V
RTS_3.3V
TXD_3.3V
RXD_3.3V
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