Neoway N720 OpenLinux - Reset_N; Figure 3-10 Reset Controlled by Button; Figure 3-11 Reset Circuit with Triode Separating; Figure 3-12 Reset Timing of N720 Openlinux

N720 OpenLinux
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
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3.2.2 RESET_N
RESET_N is used to reset the module.When the module is working, inputting negative pulse for more
than 1 seconds to RESET_N can trigger the reset process of the module. RESET_N is pulled up
internally. Its typical high-level voltage is 1.8V. Leave this pin floating if not used.
If you use a 2.8V/3.0V/3.3V IO system, it is recommended to add a triode to separate it. Refer to the
following designs. To reset the module through high level, refer to Figure 3-7.
Figure 3-10 Reset controlled by button
N720
module
RESET_N
S1
1 kΩ
ESD
R1
Figure 3-11 Reset circuit with triode separating
R1
VDD_1P8
VCC_2P8/3P0/3P3
N720
module
RESET_N
Q1
4.7kΩ
Figure 3-12 shows the reset timing of N720 OpenLinux.
Figure 3-12 Reset timing of N720 OpenLinux
VBAT
RESET_N
Inactive
Active
USB
All Interfaces
V
L
<0.6V
t≥1s