Neoway N720 - 2.3.1 VBAT; 2.3.2 VDDIO_1 P8; 2.3.3 ON;OFF

N720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 18
EMC Considerations for Power Supply
Place transient overvoltage protection components like TVS diode on power supply, to absorb the power
surges, SMAJ5.0A/C could be a choice.
2.3.2 VDDIO_1P8
VDDIO_1P8 supports output voltages of 1.8 V. It is recommended that VDDIO_1.8 V@50 mA be used
only for interface level shifting and to add ESD to protect while using.
2.3.3 ON/OFF
Power-On
After powering on the VBAT pin, use PWRKEY to start the module by inputting low-level pulse for 100
ms (a value longer than 200 ms is recommended). Do not connect an external large resistor to ground
directly because the PWRKEY pin is internally pulled up by a 200 kΩ resistor. The circuits in Figure 2-7
or Figure 2-8 are recommended to control PWRKEY.
Figure 2-7 Push switch control
Figure 2-8 MCU control
PWRKEY
Q
R1
R2
USER_ON
If the module is powered on but the power-on sequence has not been completed, the states of each pin are
uncertain. The power-on sequence of the module is shown in Figure 2-9.
S1
PWRKEY