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3.10. UART Interfaces
SC200R series module provides three UART interfaces and supports up to 4 Mbps:
⚫
UART5: 4-wire UART interface, and hardware flow control is supported
⚫
UART2 (debug UART): 2-wire UART interface, used for debugging by default
⚫
UART1: 2-wire UART interface
Table 14: Pin Definition of UART Interfaces
Pin Name
Pin No.
UART5_TXD
34
UART5_RXD
35
UART5_CTS
36
UART5_RTS
37
DBG_RXD
93
DBG_TXD
94
UART1_RXD
153
UART1_TXD
154
UART5 is a 4-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 the reference design.
LDO5_1V8
UART5_CTS
UART5_RTS
UART5_TXD
UART5_RXD
Figure 13: Reference Circuit with Level Translator Chip (for UART5)
SC200R&SC262R_Series_Hardware_Design
I/O
Description
DO
UART5 transmit
DI
UART5 receive
DI
UART5 clear to send
DO
UART5 request to send
UART2 receive
DI
(debug UART by default)
UART2 transmit
DO
(debug UART by default)
DI
UART1 receive
DO
UART1 transmit
VCCA
C1
100 pF
U1
OE
A1
A2
A3
A4
Comment
1.8 V power domain.
If not used, keep these pins
open.
VCCB
C2
100 pF
GND
B1
B2
B3
B4
Smart Module Series
VDD_3.3V
CTS_3.3V
RTS_3.3V
TXD_3.3V
RXD_3.3V
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