My customer is using ISO7741F for SPI isolaiton. They use MCU to set the EN1 pin Low and High at a certain frequency(low frequency). In this application, customer found the RE test failed at around 180MHz. If trying to fix the EN1 pin constant High, they can pass the EMC test. Could you please help to explain why switching EN1 pin frequently will induce EMC problem at ~180MHz? Any method can help to improve here? Thank you.