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13.56MHz wireless power supply chipset provides 1W for smart glasses

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By Nick Flaherty


Lapis Technology has developed a chipset capable of providing up to 1W of wireless power for wearable devices such a smart glasses as well as industrial smart, miniaturized and sealed solutions.

The ML7661 transmitter and ML7660 receiver eliminate the need for an external MCU by incorporating a control circuit required for transmission/reception, resulting in the industry’s smallest system size in the 1W class. This makes it ideal for wearables with a large battery capacity designed to be worn for long time frames. Typical products are wristband blood pressure monitors, fitness trackers, smart watches, and hearing aids, for example.

Using the high 13.56MHz frequency band enables the support for Near Field Communication (NFC).

Using a single chipset improves design flexibility in devices with rotating mechanisms that would normally be restricted by wired designs such as industrial equipment, PC cooling fans, and e-bike torque sensors.

In recent years, there has been a growing need to improve the safety of compact electronics (especially small medical devices) against electric shock. Wireless power supply eliminates the need for a power cord, significantly improving safety during charging or sweating by increasing the waterproof, dustproof, and (electric) shockproof performance of sealed housings. However, although the Qi standard is widely used and can supply up to 15W, the system size which includes the chipset and antenna is also typically large, making it difficult to incorporate into wearable devices.

Lapis, part of Rohm, previously developed the ML763x chipset that uses the 13.56MHz frequency band to deliver 200mW of power and enable communication wirelessly. There were calls for increased power to support wearables with large battery capacities such as wristband blood pressure monitors, smart watches, and hearing aids.

An evaluation kit is available that makes it easy to immediately begin evaluation of this new 13.56MHz wireless power supply chipset. Rohm supports the configuration of charging systems that meet various customer requirements. For example, tools for individual user settings from a PC along with documents related to antenna design and adjustment are available.

Samples are available now with mass production planned for April 2022

www.lapis-tech.com/en/semicon/wpt/landing/ml7660_61.html

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