Neoway N715-EA - UART Interface Overview and Reference

N715-EA Hardware User Guide
Chapter 5 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
41
UART1_RTS
33
DO
UART ready to send
communications
FW in open version: used
for data transmission.
UART1_CTS
34
DI
UART clear to send
UART1_DTR
39
DO
UART data terminal
ready
UART1_RI
40
DI
UART ring indicator
UART1_DCD
48
DI
Carrier detect output
UART2_RTS
121
DO
UART ready to send
Used for data transmission
UART2_CTS
122
DI
UART clear to send
UART2_RXD
123
DI
UART data input
UART2_TXD
124
DO
UART data output
DEBUG_UART_RXD
72
DI
DEBUG data input
Use for module debugging
DEBUG_UART_TXD
71
DO
DEBUG data output
N715-EA provides three UART interfaces, two of which support hardware flow control. They support
1.8 V level and baud rates up to 921600 bps. The following figure shows recommended design of
UART interface.
Figure 5-15 Reference design of UART interface
N715-EA Module
UART_RXD
UART_TXD
UART_CTS
UART_RTS
GND
Device
MCU_TXD
MCU_RXD
MCU_UART_RTS
MCU_UART_CTS
GND
Schematic Design Guidelines
⚫
Pay attention to the corresponding relations between the signal direction and the connection.
⚫
It is prohibited to use diodes for voltage-level translation.
If the UART does not match the logic voltage of the MCU, add a voltage-level translation circuit outside
of the module. Three transistor translation circuits are recommended based on the differences in logic
levels and rates.