一、Scheme protection circuit diagram

二、Application Environment
1. Mobile phone CCM module
2. Industry applications of CCM modules such as offline payment and gates;
3. High electrostatic protection requirements
三、Explanation of the plan
1. The signal port adopts OVE2902R1 3.3V/15pF/DF0603 package
2. Can pass GB_T17626.2-2006 (IEC61000-4-2) contact 8KV, air 15KV test (test board)