Walter Chen

Maxim - Senior Scientist, Applications


Dr. Chen specializes in mixed-signal processing at Maxim Integrated Products

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Key-Switch Controllers Enhance Smart Phones

The key pad of most smart phones employs one of two key-scanning methods: conventional or low-EMI. By describing and comparing these methods, the following discussion illustrates a major benefit of the low-EMI method - it eliminates the need for EMI filters.

The conventional key-scan method. Basic EMI filter structures. Maxim’s low-EMI key scan method. Simulated key scan PSD levels. The blue curve represents the conventional method, and the green curve represents the passive-scan method used by Maxim.
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Tags: key-switch, controller, EMI, capacitive loading,
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