Smart Module Series
SC262R_Series_Hardware_Design 45 / 115
and with ground planes above and below.
⚫
Make sure the trace length difference between USB 2.0 differential data signals is less than 0.7 mm.
Table 10: USB Trace Length Inside the Module
3.10. UART Interfaces
SC262R 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 11: Pin Definition of UART Interfaces
UART5 is a 4-wire UART interface with 1.8 V power domain. You should use a voltage level translator if
your application is equipped with a 3.3 V UART interface. The following figure shows the reference
Pin No.
Signal
Length (mm)
Length Difference (DP - DM)
13
USB_DM
32.25
-0.10
14
USB_DP
32.15
Pin Name
Pin No.
I/O
Description
Comment
UART5_TXD
34
DO
UART5 transmit
1.8 V power domain.
If not used, keep these pins
open.
UART5_RXD
35
DI
UART5 receive
UART5_CTS
36
DI
DCE clear to send
UART5_RTS
37
DO
DCE request to send
DBG_RXD
93
DI
UART2 receive
(debug UART by default)
DBG_TXD
94
DO
UART2 transmit
(debug UART by default)
UART1_RXD
153
DI
UART1 receive
UART1_TXD
154
DO
UART1 transmit
