Neoway N720 OpenLinux - Figure 3-16 Reference Design of UART Connection (with Flow Control); Figure 3-17 Reference Design of UART Connection (Without Flow Control)

N720 OpenLinux
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
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Figure 3-16 Reference design of UART connection (with flow control)
UART3_RXD
UART3_TXD
MCU_TXD
MCU_RXD
GND GND
N720
module
Client
UART3_CTS
UART3_RTS
MCU_RXD
MCU_RXD
Figure 3-17 Reference design of UART connection (without flow control)
UART5_RXD
UART5_TXD
MCU_TXD
MCU_RXD
GND GND
N720
module
Client
Schematic Design Recommendations

Note the match of signals.

If the UART does not match the logic voltage of the MCU, add a level shifting circuit outside of
the module. Three types of level shifting circuit is recommended based on the logic level quality.
If the low level at MCU_UART (V
IL
) is lower than 200mV, adopt recommended level shifting circuit 1.