NFC/RFID enables communication with transponders. The transponders include memory that can store various information including URLs, Bluetooth® connection handover, contact information, diagnostics, and now sensor measurement data. Battery-less sensor measurements that utilize energy harvesting from the RF field can be implemented in applications ranging from medical, health and fitness, and industrial where instantaneous measurements are required and a battery is not feasible or desired. This application report discusses the implementation of a single chip NFC/RFID field powered temperature sensor system with the RF430FRL152H.
Project collateral discussed in this application report can be downloaded from www.ti.com/lit/zip/sloc322.
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The schematic and layout are shown in Figure 1 and Figure 2. The design keeps a low component count by using integrated features of the RF430FRL152H such as the internal A/D converter and ROM functions for acquiring sensor measurements from a thermistor (RT1). This design also offers the flexibility to include a 1.5 V battery at TP1/TP2 if data logging is required and the RF field will not always be available to provide power. The hatched ground pour is used for improved RF performance.