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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, says the company. This makes it ideal for wearables with a large battery capacity designed to be worn for long periods of time.

Typical products include wristband blood pressure monitors, fitness trackers, smart watches, and hearing aids, for example. Moreover, the adoption of the high 13.56MHz frequency band enables the support for Near Field Communication (NFC).

Providing wireless power and communication in a single chipset, says the company, contributes to improved 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. It also addresses a need to improve the safety of compact electronics (especially small medical devices) against electric shock.

A 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.

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.

LAPIS Technology
ROHM Semiconductor


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