All PSoC Application Notes

AN2055: Low Power Contactless Tag Reader

Contactless radiofrequency identification is popular in many electronic applications such as access control, automotive, object identification... Its uses a powerless tag (often a plastic card) whose power is provided by a reading coil in the form of a coupling voltage. This article describes a 125 kHz reader design using a Cypress PSOC CY8C26233 (20 pins, 8 Kbytes flash). In this application, a few passive components and no active component other than the PSOC is required to build a complete, versatile and very low-power reader.