The ST25R210 by STMicroelectronics is a universal NFC device supporting NFC initiator, NFC target, NFC reader, and NFC card emulation operations. The high output power, up to 1,6 W, facilitates easy integration into applications with small antennas. The reader offers an excellent read range and features improved low-power card detection (LPCD), which increases the detection range in inductive wake-up mode. During this low-power wake-up mode, the system detects the approach or removal of tags. The IC includes an RC oscillator and a programmable timer to automatically scan for cards or other NFC-enabled devices, such as smartwatches or phones, when in wake-up mode.
The device achieves long-range and low-power card detection by measuring the I and Q channels, which represent the real and imaginary parts of the antenna signal. This approach minimises power consumption. It operates across a wide power supply range (2,7 to 5,5 V), an ambient temperature range (-40°C to +105°C), and a wide peripheral I/O voltage range (1,65 to 5,5 V).
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