Designing for Conducted Noise Immunity
The challenges associated with passing conducted-noise immunity test are frequently understimated
when a PCAP touchscreen is implemented into a product.
Passing conducted noise immunity tests can be particularly challenging for electronic products equipped
with a projected capacitive (PCAP) touchscreen for interface with the user, especially those targeted at
industrial or medical markets that must meet 61000-4-6 Level 2 or Level 3 specifications.
• When designing for noise immunity, it is important to have knowledge of the target market.
• Design for noise immunity at the beginning of a project before hardware design and component
selection are firm.
• Consider potential alternative markets for the product as early as possible to save re-engineering
costs later.
• Best design practice requires an investment in time and expertise, and may add to the
bill of materials (BoM) cost, but can deliver greater dividends by saving expensive redesign and
re-testing later on.
• Engage with a partner who has experience in a touchscreen that will pass EMC regulations.
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