AN-1124 – Recommendations for Sealing InvenSense Bottom-Port MEMS Microphones from Dust and Liquid Ingress

AN-1124 – Recommendations for Sealing InvenSense Bottom-Port MEMS Microphones from Dust and Liquid Ingress

This application note describes a seal made of rubber or silicone rubber or a similar soft material, designed to protect bottom-port PCB-mounted microphones from dust and liquid. The described approach creates minimal performance side effects, while allowing a watertight system design.

This application note describes the following:

  • Theory behind the design
  • Design parameters and materials
  • Experimental results
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