semiconductor

Ams launches world's smallest proximity sensor module to increase TWS headset usage time

来源:中国电子报、电子信息产业网 发布时间:2019-11-15 17:16 我要评论 Author: Zhang Xinyi Source: China Electronics News, the electronic information industry network Date: 2019-11-15 17:16 I want to comment

TWS (True Wireless Headphones) represented by Apple Airpods has driven the rapid growth of the wearable device market. How to improve the wearing experience and battery life has also become the focus of competition for TWS manufacturers. Recently, Ams Semiconductor has launched the world's smallest digital proximity sensor module, TMD2635, with a package size of only 1mm 3 , which helps audio manufacturers producing TWS earphone products to develop smaller and lighter industrial design earphones. Infrared proximity sensor can realize wireless earphone in / out ear detection, help extend battery life after a single charge, and can be used with another TMD2635 to achieve basic touchless gesture control.

The data shows that the earbuds market will maintain a compound annual growth rate of 27% by 2023. By then, wireless earbuds are expected to surpass all other wireless and wired product categories and become the world's most popular headset type. As users further embrace and integrate into the modern lifestyle, the usage rate of consumer audio wireless headphones will continue to grow. By integrating the TMD2635 module into the new TWS earbud design, wearable device manufacturers can meet consumer demand for smaller and more comfortable wearing products. Due to the reliable detection of earbuds in / out of the ear, these products can be used on a single charge Longer.

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Spencer Bai, Director of Market Application Engineering, Ams Greater China

According to Spencer Bai, director of market application engineering at Ams Greater China, ordinary Bluetooth headsets usually have a Bluetooth chip in the system. After TWS, because the two headsets are separated, the most basic TWS headset contains two Bluetooth chips. Everything needs to be matched. This means that although the size of TWS headsets is getting smaller and smaller, there is more and more stuff inside and the power consumption is getting bigger and bigger. In this case, consumers do not want to use TWS headsets to recharge for half a day. More usage scenarios of TMD2635 are that if the user of the headset is not normally worn, all the power-consuming parts of the system will be turned off immediately. Its standby power consumption is very low, which is equivalent to suspending the work of the entire system. The chip is turned on and turned off when not needed. From this scenario, it can greatly improve the use time of the TWS headset.

Ams TMD2635 module is a complete optical-digital sensor module that integrates a low-power infrared VCSEL (vertical cavity surface emitting laser) transmitter, two sensor pixels for near-field and far-field sensing, and digital Fast mode I 2 C interface, all in a micro-connected grid array (LGA) package.

Compared with the previous generation 2-in-1 infrared proximity sensor module, the TMD2635 is 6 times smaller in size. Because of the placement of separated near / far photodiode offset transmitters and detectors, designers of wireless earbuds and other wearable and portable devices have more flexibility in optimizing the size and shape of the sensor aperture required for industrial design, as well as optimizing the product's Comfort and performance-with 1.5mm diameter round holes or 1x2mm oval holes.

The data released on the site shows that the TMD2635 consumes 70µA on average in the operating mode and 0.7µA in the sleep mode. Currently, TMD2635 has achieved mass production.


Editor-in-chief: Zhang Xinyi
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