Neoway N720 - 2.3.4 RESET

N720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 20
2.3.4 RESET
The RESET pin is used to reset the module. Low level for more than 1 second at this pin triggers module
reset. This pin is pulled up internally. Its typical high-level voltage is 1.8 V. Leave this pin unconnected if
it is not used. If 2.8 V/3.3 V IO system is used, separate it by adding a triode. Refer to the following
design.
Figure 2-11 Reset controlled by button
RESET
S1
Figure 2-12 Reset circuit with triode separating
Q1
R2
R1
VDD_EXT
RESET
2V8/3V3/3V0
In a circuit shown in Figure 2-12, VDD_EXT=2.8V/3.3V/3.0V, R1=4.7K, R2=47K.
Figure 2-13 shows the reset sequence.
Figure 2-13 N720 reset sequence
VBAT
RESET
1s
10s
Inactive
Active
USB/UART