User's Manual

720 Hardware User Guide

high-level voltage is 1.8 V. Leave this pin disconnected if you do not use it. If you use a 2.8V/3.3V

IO system, it is recommended that you add a triode to separate it. Refer to the following design.

Figure 2-11 Reset controlled by button

Figure 2-12 Reset circuit with triode separating

In a circuit shown in Figure 2-12, VDD_EXT=2.8V/3.3V/3.0V, R2=4.7K, R3=47K. Figure 2-13

shows the reset sequence.

Figure 2-13 N720 reset sequence