Memory capacity and speed dictate cost, which is a critical consideration for companies that want to spread information far and wide through smart posters or flyers. Generally, tag size ranges from just a centimeter or two to a few inches. Tags with higher memory and larger antennas are bigger in physical size. They can be rewritten thousands of times but also blocked so they can't be overwritten. Anyone can buy blank rewritable NFC tags. Īlthough all NFC tags are read-only, types 1, 2 and 3 can be rewritten. Type 5 stores up to 64 bytes and has a speed of 26.58 Kbps. Type 1 tags typically store from 93 bytes to 2 kilobytes and work at 106 Kbps (kilobits per second) Type 4, until recently the biggest and fastest, stores up to 32 KB and work at speeds of up to 424 Kbps. You can read more about magnetic induction in How Wireless Power Works.Īs of this writing, there are five flavors of NFC tags, types 1 through type 5, all featuring different capacities, data transfer speeds and read/write capabilities. When a reader gets close enough to a tag, it energizes it and transfer data from that tag. Instead, they literally draw power from the device that reads them, thanks to magnetic induction. NFC tags are passive, meaning they don't have any power source. But what exactly gives an NFC tag its enchanting powers? When it comes to the potential uses of NFC tags, there are no limits. Scanning a special NFC code allows you to conduct a transaction, such as renting an electric scooter or paying for gas, for example, without having to download and install a specialized app to do it. But in 2020, Apple released a new feature in its iOS operating system called App Clips. Finding, downloading and setting up a new app can be, at least, a pain, and, at most, keep you from using the technology at all. For most of us, that's our smartphone or smartwatch and the apps we install on it. Taking advantage of the flexibility of near-field communication requires having the hardware and software to read it. You could also pay for items without entering credit card details if the reader was linked to a payment system such as Apple Pay or Google Pay. Or, at your favorite restaurants, you can touch your phone to an NFC tagged menu and voila! - you have the entire menu on your phone, along with nutritional information and mouth-watering descriptions of the ingredients in your favorite dishes. At the same time, you also instantly receive a snappy biography in the form of a text file and image. Tap the tag with your device, and you're directed to a website touting a candidate's credentials. For example, a smart tag could be embedded into a political flyer. To pay for your purchase, you just log in to your phone to approve the sale and move the phone close to the NFC reader at the checkout.īut NFC can do more than help you pay for things. Similar technology is embedded at the point of sale at your local store. As a matter of fact, NFC chips are often incorporated right into your smartphone's circuitry. Unlike with RFID, NFC readers aren't always specialized devices. So NFC tags are used for other applications where the ability to exchange a few bits of digitized information quickly comes in handy. NFC readers aren't suitable for RFID-style inventory tracking their range is too short. Whereas RFID can be used from a distance, NFC readers work at a maximum range of about 4 inches (10 centimeters). NFC works like RFID, only it's a more up-close-and-personal type of wireless.
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