NFC Forum Candidate Technical Specifications

Candidate Technical Specifications

NFC Forum Candidate Technical Specifications are very mature technical specifications whose final adoption is delayed so as to allow verification of its quality, to progress on related test specifications, or the like. Candidate Technical Specifications have different licensing restrictions than adopted Technical Specifications. Companies that are not members of the NFC Forum can purchase candidate specs and offer feedback, and will be provided the final adopted spec at no charge.

NFC Money Transfer (NMT) Candidate Technical Specification

The NFC Money Transfer (NMT) Specification defines the functions that enable two NFC Forum Devices to transfer money – such as passing money to an individual or paying a bill in a convenience store. This specification defines Money Transfer (MT) protocols, the corresponding message structures for those protocols, and the NFC Forum Well Known Types used in those messages.

The NMT Specification gives payment service providers and consumers the opportunity to take advantage of the simple and secure NFC-based payment solutions already in use worldwide as an alternative to QR code-based solutions. The NMT solution improves the speed and efficiency of the payment process by eliminating the need for a camera or scanner used in QR code-based solutions. It provides an open framework which can be easily used by payment service providers to map their already defined data exchange for QR code-based payment solutions with NFC communication. The specification works between all NFC-enabled devices such as smartphones, readers and tags.

Wireless Charging (WLC) Candidate Technical Specification

The Wireless Charging Candidate Technical Specification (WLC) makes it possible to wirelessly charge NFC-enabled devices at a power transfer rate of up to one watt. The WLC enables a single antenna in the NFC-enabled device to manage both communications and charging. This solution makes it easier and more convenient to charge low-power IoT devices such as smart watches, fitness trackers, headsets and other consumer devices.

This NFC specification uses the 13.56 MHz base frequency and leverages the NFC communication link to control the power transfer. NFC technology is unique in that it allows the transfer of power to an NFC tag to enable communication by providing a constant carrier signal. The WLC specification extends this communication functionality of NFC technology to enable wireless charging.

The WLC specification ensures a safe charging process between two NFC-enabled devices in either static or negotiated modes. Static mode uses standard radio frequency (RF) field strength and provides a consistent power level. Negotiated mode uses a higher RF field supporting four power transfer classes of 250, 500, 750 and 1000 milliwatts.