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AN60639 - PSoC® 1 Piezo Keypad Implementation | Cypress Semiconductor

AN60639 - PSoC® 1 Piezo Keypad Implementation

Last Updated: 
Jun 26, 2020

AN60639 describes the implementation of a piezo keypad using PSoC® 1. The solution described here provides reliable operation and a press time detection of up to two minutes.


Piezo sensors enable touch detection in the presence of metal surfaces, under water, in industrial environments with strong electrical fields, and in the chemical industry. They work on various surfaces including metal. Piezo sensors convert applied force into voltage. Therefore, they are not sensitive to external electrical and magnetic fields, water drops, or grounded surfaces.

This application note discusses a simple and cost effective solution to scan a piezo keypad without external components.

Dear valued customer,

Thank you for choosing our products. They come with all the know-how and passion that our engineers have put into it. As you probably already know, Cypress is now Infineon. This is a major step for our company, but also for the good of you. 

Reliability and business continuity are of utmost importance for us. Hence, we remain fully committed to honoring existing customer and distributor relationships. This includes offering the legacy Cypress product portfolio. We thank you very much for your trusting support.

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