~With the industry's ultra-small system size, the wearable device has both wireless power supply and non-contact communication functions~

Lambi Stone Technology Co., Ltd. (hereinafter referred to as "Lapi Stone Technology"), a subsidiary of the world-renowned semiconductor manufacturer ROHM Group, has developed wireless power supply chipsets "ML7661" (transmitter) and "ML7660" for wearable devices. "(Receiving end).

In recent years, there has been a high demand for improving the safety of small electronic equipment, especially small medical equipment, against electric shock. The wireless power supply does not require a power connector, and its sealed housing can improve waterproof and dustproof performance, so it can greatly improve the safety against electric shock when charging and sweating. Although there is a very popular Qi standard*2 in the field of wireless power supply, the power supply is large, up to 15W, but its system size including antenna size and chipset is also large, so it is difficult to install in wearable devices. middle.

In response to this problem, Lambishi Technology, a subsidiary of ROHM Group, uses 13.56MHz as the wireless power supply frequency band to develop a wireless power supply chipset "ML763x" with built-in wireless power supply function and non-contact communication function, and the power supply is 200mW. Mass production will begin in June 2020. Since the product was put into the market, it has been highly praised by users. At the same time, users hope that the chipset can be used in wearable devices with large battery capacity such as wrist blood pressure monitors, smart watches and hearing aids, and the voices that can increase the power supply are also increasing. Come higher. In this context, Lambishi Technology has developed a new set of products with a small size and a power supply of up to 1W, which further expands the application range of wireless power supplies.

The new product has built-in control circuits required for power transmission and reception, without the need for an external microcontroller. At the 1W power supply level, the industry's ultra-small system size is achieved. The new product is very suitable for wearable devices with large battery capacity that need to be worn for a long time, such as wrist blood pressure monitors, smart watches, hearing aids, etc. In addition, since the new product uses a high frequency band of 13.56MHz, it also supports contactless communication of the near field communication standard "Near Field Communication (NFC)*1" with the same frequency. Because of wireless power and communication with 1 chipset, in devices with rotating mechanisms that limit design flexibility in wired power systems, such as in industrial equipment, computer cooling fans, and torque in electric bicycles In applications such as sensors, it helps to improve product designability and design flexibility.

Samples of the new product have been sold in September 2021 (sample price 500 yen/piece, excluding tax), and it is planned to start mass production with a monthly production of 100,000 pieces from April 2022. The production base of the pre-process is the LAPIS Semiconductor Miyagi Plant (Miyagi, Japan), the production base of the post-process "ML7661" is ROHM Integrated Systems (Thailand) Co., Ltd., and the "ML7660" is the LAPIS Semiconductor Palace Saki Factory (Miyazaki Prefecture, Japan).

In the future, LAPIS will continue to promote the development of high-quality wireless power supply LSIs and contribute to the creation of an intelligent society that is livable for human beings.

<New product features>

1. Achieve up to 1W wireless power supply with the industry's smallest system size

The new product can optimally control the transmission power according to the required power supply, thus suppressing the heat generation of the LSI body, enabling wireless power supply of up to 1W. In addition, due to the use of 13.56MHz high frequency band for power supply, the antenna size can be smaller. Compared with ordinary products, the system size can be reduced by 30%, so it is very suitable for small electronic devices such as wrist blood pressure monitors, smart watches and hearing aids. In addition, since communication protocols supporting the I2C interface*3 and SPI interface*3 are built-in, digital sensors, etc. equipped with these functions can be controlled without a microcontroller. In this way, the installation space of the microcontroller can be reduced, and the system size of the new product is the smallest in the industry even compared with ordinary products with the same 1W power supply.

2. With both wireless power supply and contactless communication functions, it helps to improve the designability and design flexibility of application products

Since the wireless power supply of the new product adopts the 13.56MHz high frequency band, contactless communication with products that also support the 13.56MHz near field communication standard "Near Field Communication (NFC)" can also be realized. Since both wireless power supply and non-contact communication functions are combined, devices with rotating mechanisms (which limit design flexibility in wired power supply systems), such as industrial equipment, computer cooling fans, and electric bicycle torque sensors*4 In other applications, it helps to improve product designability and design flexibility. In addition, by adopting LAPIS Technology's own communication format, the data communication interval is shortened from 4ms in ML763x to 1ms in ML766x, so as to realize more real-time speed control and monitoring.

3. Microcontroller-free systems can be constructed, reducing development man-hours

When using a new product, it is only necessary to adjust the amount of power transmission to improve the power supply efficiency, and to set parameters such as the temperature threshold according to the specifications of the secondary battery, and the system can be easily constructed. This eliminates the need for a microcontroller for system control and program development, which greatly contributes to reducing development man-hours. At the same time, the new product also has a low power consumption mode, which greatly reduces the power consumption when the system is in standby.

<Development Support>

This chipset is equipped with "ML766x" evaluation kit, which can easily start the evaluation of 13.56MHz wireless power supply. In addition, configuration tools and documents related to antenna design and antenna adjustment are also available. Users can set these individually through a computer, and can build various power supply systems according to customer needs.

<Product Specifications>

<Field of application>

・Wearable medical devices in the following medical device fields: Hearing aids, wrist sphygmomanometers

・Wearable devices: Smart glasses, smart watches

・Rotating equipment: Cooling fans and torque sensors for electric bicycles, etc.

<Explanation of terminology>

*1: Near Field Communication Standard "Near Field Communication (NFC)"

NFC is a short-range communication technology that uses a frequency of 13.56MHz to communicate over a short distance. The specifications in the standard are developed by the industry standards organization "NFC Forum". ROHM is an associate member of the NFC Forum.

*2: Qi standard

An international standard for wireless power supply developed by the Wireless Power Consortium. Wireless power supply for smartphones.

*3: I2C interface, SPI interface

I2C is the abbreviation of Inter-Integrated Circuit, and SPI is the abbreviation of Serial Peripheral Interface, both of which are one of the synchronous serial communication methods between devices used inside the computer. Compared with the asynchronous serial communication method, high-speed communication is possible, and multiple slaves can be connected.

*4: Torque sensor

A sensor that converts the magnitude of the force (torque) during rotation into an electrical signal. In electric bicycles, it is used to detect the braking force and feedback the detection result to the motor.

Edit: fqj

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