Neoway N10 - Figure 3-13 Recommended Level Shifting Circuit 1

To Next Page

To Previous Page

N10_Hardware_User_Guide

The UART of N10 works at 2.8 V CMOS logic level. The voltages for input high level should not exceed

3.1 V. UART supports baud rates of 9600, 14400, 19200, 38400, 57600, 115200 bit/s, and the default rate

is 115200 bit/s.

If the UART does not match the logic voltage of the MCU, add a level shifting circuit outside of the

module as shown in Figure 3-13 (for V

OL_MAX

≤200 mV) and Figure 3-14 (for V

OL_MAX

>200 mV).

Figure 3-13 Recommended level shifting circuit 1

TXD

VIO28

VCC_IO

4.7K

10K

MCU_URXD

MCU_UTXD

RXD

10K

4.7K

VIO28

Components:

R2/R4: 2 kΩ-10 kΩ. The greater the UART baud rate is, the lower the R2 value is.

R1/R3: 4.7 kΩ-10 kΩ. The greater the UART baud rate is, the lower the R3 value is.

Q1: MMBT3904 or MMBT2222 High-speed transistor is better.

MCU_UTXD and MCU_URXD are respectively the TX and RX ports of the MCU while UTXD and

URXD are respectively the TX and RX ports of the module.

Voltage at VCC_IO is the voltage at the UART of the MCU while voltage at VIO28 is the voltage at the

UART of the module.

Figure 3-14 shows another recommended level shifting circuit.

Other manuals for Neoway N10