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New Label Changes Displayed Price Data With Power from RFID

Powercast's new Batteryless Electronic UHF Retail Price Tag receives pricing information from an RFID interrogator, while also harvesting the RF energy, then uses that energy to change the price accordingly on its display.
By Claire Swedberg

When the handheld device comes within approximately 2 meters (6.6 feet), the labels are energized with RF power, which they then convert to DC. They send a response in the form of a unique ID, and the handheld reader identifies that tag and transmits instructions to change the content on its e-paper display. The handheld then displays information for the user regarding which labels have been updated. That data, if stored in the cloud, could then be accessed by store management.

Some stores are investigating the option of using the system with fixed readers, Greene reports. For instance, several retailers already have fixed readers installed in their facilities, and they would use that existing infrastructure to update pricing on the Powercast tags. In the case of fixed readers, he notes, the system could be configured to send data at a distance up to 10 meters (32.8 feet), while the capture of data and sufficient power to update the e-paper display would take somewhat longer—about 45 seconds.

"The physical energy needed to change the screen would require a longer interrogation time," Greene says, because the transmission comes from a longer distance. This could be accomplished during off-business hours, such as at 2 AM, Greene explains, so that the long transaction time would not be a challenge.

The solution also works for other applications beyond retail, such as health care. The e-paper—which uses a segmented display—can display both words and numbers, so a reader could update information such as whether supplies on a shelf or in a drawer require replenishment, for instance. "Each user may have their own product requirements" for labels, Greene says, and Powercast will work with solution providers to develop a specific label for each use case.

An evaluation kit for the Batteryless Electronic UHF Retail Price Tag is expected to be made available in the fourth quarter of 2018, from distributors Arrow Electronics and Mouser Electronics. Powercast will work with partners to design their own battery-less price tags using Powercast's PCC110 chip—the same power-harvesting RF-to-DC converter chip used in the PCT100 sensor tag, as well as an NXP Semiconductors UCODE RFID chip.

Later this year, the company intends to release a PowerSpot TX91503 transmitter that can send an RF signal to a device, such as consumer electronics-based headphones or game controllers, in order to wirelessly charge it at a distance of up to 3 feet.

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