< 概要>
ROHM Group's Lanbishi Semiconductor Co., Ltd. develops the world's smallest wireless power supply control chipset 'ML7630 (receiver/terminal)' 'ML7631 (transmitter/charger terminal)' for wearable devices.
This chipset is a wireless power supply control LSI that is suitable for wireless power supply of smart earphones*1 such as Bluetooth® headsets that have installation space limitations in wearable devices. To enable support in smart ear-mounted devices For the application, Lanbishi Semiconductor miniaturizes the antenna (coil) by performing power transmission at a high frequency of 13.56 MHz, and integrates the functions required for charging into one chip, making it available as a SoC*2 (system-on-chip). , which greatly reduces the installation space (50% compared to the area of the MicroUSB connector). The wireless power supply of the smart ear-worn device, which was previously difficult to achieve, not only contributes to the miniaturization of the device, but also helps Improve the convenience of charging, waterproof and dustproof.
Even if the battery is depleted, the receiver's 'ML7630' can use the antenna's magnetic field to generate power and start working. In addition, although the small WL-CSP package is only 2.6mm square, it achieves wireless power supply up to 200mW output power. Not only that , Also meet the NFC Forum Type3 Tag v1.0 ※ 3 specification, support NFC-based Bluetooth® pairing and other functions. Moreover, the transmitter's 'ML7631' can work through the 5V power provided by the USB power of mobile phone battery, which is very conducive to mobile charging The development of the device.
The chipset has already begun to sell samples, and it is expected to begin mass production in May 2018. The production base for the previous process is Rinpoche Semiconductor Miyagi Co., Ltd. (Miyagi Prefecture), and the production base 'ML7630' for the latter process is BLUEBILI. Ishimi Miyazaki Co., Ltd. (Miyazaki Prefecture), 'ML7631' is ROHM Integrated Systems (Thailand) Co., Ltd..
In the future, Lanbishi Semiconductor will continue to develop wireless power supply products and provide solutions for small electronic devices, contributing to the intelligent development of the society.
< 背景>
In recent years, the 'smart earphone device' worn on the ear has attracted much attention as a new generation of wearable devices. However, due to the ultra-compact size of the smart ear-worn device, the terminals for power supply such as the Micro USB connector are made compact. With the big problem of further space saving.
Under this background, wireless power supply can be used without terminals, which will greatly facilitate the miniaturization of the device. In addition, there is no terminal to improve the waterproof performance, dustproof performance, etc., which is very effective for ultra-small devices. system.
ROHM Group has been developing and supplying products that meet the wireless power supply standards (WPC Qi, etc.) for terminals such as smartphones and tablet PCs. As a key member of the NFC Forum, ROHM Group is a member of the ROHM Group. Actively participates in the development of the 13.56 MHz wireless power supply standard for wearable devices that require ultra-small wireless power systems. < 新产品特点>
1.Wireless power supply saves space in the power supply department
By using the 13.56 MHz wireless power supply, the chipset can use a small antenna of about 1 μH, which is very helpful for the wireless power supply of wearable devices such as smart ear-worn devices. The terminal-less configuration is beneficial to the device. Further miniaturization. For example, using an ultra-small antenna (such as the MNA4040 produced by MARUWA Co., Ltd.) can reduce the area by 50% (the area ratio calculated by the company) compared with the area occupied by the power supply unit that used the MicroUSB connector.
2. No microcontroller, more space-saving, no need to develop software to build the system
The 'ML7630' and 'ML7631' integrate the functions required for power transmission and reception into one chip, respectively, enabling wireless power control without the need for a microcontroller. Therefore, not only is software development unnecessary, but also because the microcontroller installation is saved. Space helps further miniaturization. Special PC tools can be used to customize the charge voltage level and recharge.
3. Rich functions, support smart ear-wearing devices
1 The battery can start working even when the battery is dead. The 'ML7630' on the receiving end can use the magnetic field generated by the antenna to supply power, so even if the battery runs out, it can start working.
LDO and Temperature Management with 2200mW Output Lithium-Ion Batteries The 'ML7630' has a built-in 200mW output LDO and uses a charge IC to charge the Li-Ion battery. In addition, it utilizes a built-in 10-bit AD converter and The comparator can be programmed to implement temperature management (temperature detection, threshold management), which is very important for lithium-ion batteries, so that reliable charge control can be performed.
3 Meet the NFC Forum Type 3 Tag specification 'ML7630' supports the NFC Forum Type3 Tag v1.0 specification. It can read tag information written in the Flash ROM of the 'ML7630' from a device that uses NFC technology such as a smartphone. Features such as NFC touch Bluetooth® pairing without screen operation or switch operation.
< 开发支持>
The chipset is also equipped with the 'ML763x' evaluation kit, which allows easy start of wireless power evaluation. In addition, configuration tools are provided and the antenna supports related documents. Using these documents enables user-specific settings via the PC, supporting various charging methods. .
■13.56MHz Wireless Power Supply (NFC) Chipset Engineer's Technical Information Website (Support Page) http://www.lapis-semi.cn/cn/datasheet/wpt.html ■13.56MHz Wireless Power Supply (NFC) (Ad hoc page )http://www.lapis-semi.cn/cn/semicon/wpt/landing/ml7630_31.html
'Application area' wearable devices, smart ear wearing devices
< 术语解说> *1: Wearable device Wearable device worn on the ear, including wireless headphones, wireless in-ear headphones, etc. In recent years, with the development of high-performance smartphones, the rapid development.
*2: SoC (System on a Chip, System-on-Chip, System-on-Chip) generally refers to an IC that integrates functions required for system operation. Here it refers to the integration of wireless power, charging, and temperature management functions into one chip.
*3: NFC Forum Type3 Tag v1.0 NFC (Near Field Communication) refers to a near field communication technology that communicates at a proper distance using a frequency of 13.56 MHz. The specification is defined by the NFC Forum. Type 3 is one of its specifications.