Neoway N11 - Figure 3-12 Recommended Level Shifting Circuit 2

N11
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
18
Figure 3-12 Recommended level shifting circuit 2
C1 220pF
UART_TXD
R1 10 kΩ
R2 47
kΩ
R3 4
.7 kΩ
VDDIO_2P8
R4 22 kΩ
C2 220pF
R5 47
kΩ
R6 4.7 kΩ
Q1
Q2
MCU_RXD
VCC_IO
C1 220pF
UART_RXD
R1 10 kΩ
R2 10
kΩ
R3 4.7 kΩ
VDDIO_2P8
R4 4.7 kΩ
C2 220pF
R5 47
kΩ
R6 4.7 kΩ
Q1
Q2
MCU_TXD
Q1, Q2: MMBT3904 or MMBT2222. High-speed transistor is better.
MCU_TXD and MCU_RXD are respectively the TX and RX ports of the MCU while UART_TXD and
UART_RXD are respectively the TX and RX ports of the module.
VCC_IO indicates the voltage at the UART of the MCU while VDDIO_2P8 indicates the voltage at the
UART of the module.