This application note presents the calculation method for the antenna matching circuit used in ST CRX14 Coupler series.
The document provides an application note (AN1806) detailing the calculation of antenna matching circuits specifically designed for the CRX14 Contactless Coupler Chip. The CRX14 is a short-range RFID reader chip compliant with ISO 14443 Type B, operating at 13.56 MHz and delivering up to 100 mW of RF power.
The guide covers fundamental equations for electromagnetic fields and inductance, including calculations for planar rectangular coils and magnetic coupling factors. It outlines a step-by-step design process using an Excel spreadsheet tool included in the appendix to determine capacitor values and read range based on layout parameters.
| Operating Frequency | 13.56MHz |
|---|---|
| RF Power Output | 100mW |
| Power Supply Voltage | 5V |
| Package Type | SO16N |
| Data Transfer Rate | 106kbit/s |
The CRX14 is compliant with the ISO 14443 type B proximity standard.
The chip features the ST anti-collision mechanism to detect and identify all tags in the operating range.
Yes, it can authenticate tags equipped with the France Telecom anti-clone capability.