Electronic Enthusiasts Network reported (text/Wu Zipeng) With the release of more and more RISC-V chip products, the combination of RISC-V and terminal applications has become more and more close. For RISC-V, because it directly benchmarks the ARM architecture, RISC-V may be involved in almost every mature application field of ARM architecture chips, of course, including the field of wearable devices.

In early June, according to data released by the global data analysis agency IDC, the global wearable device market declined for the first time in the first quarter of 2022, with total shipments of 105.3 million units, down 3% year-on-year. However, for the entire industry, this does not mean that there has been a “ceiling effect” in wearable devices, and the future potential of this industry is still huge. As predicted in the “2021 Global Smart Wearable Device Industry Research and Trend Analysis Report”, it is expected that the global wearable device shipments will reach 800 million units by 2025, and at the level of 533 million units in 2021, there will still be A relatively large increase, the CAGR will still be higher than 10%.

The entire RISC-V industry is also very optimistic about the development of wearable devices, and many manufacturers have launched related products.

The most well-known should be Huami Technology. On July 13, 2021, the company officially released a new generation of smart wearable chip “Huangshan 2S” at the Next Beat 2021 conference. Since September 17, 2018, Huami Technology released the world’s first AI chip for wearable devices – “Huangshan No. 1”, the company has continued to deepen the application of RISC-V in the field of wearable devices, and integrated the RISC-V architecture Features such as high performance, low power consumption, small size, and easy expansion are actively introduced into the wearable field.

At the recently held RISC-V “Xiangshan On Core” forum, Meng Jianyi, vice president of Pingtouge Semiconductor Co., Ltd., said that commercial RISC-V chips should be well integrated with vertical fields, and more subdivisions should be made. Obviously, Huami Technology has been well versed in this since it entered the game. According to the needs of smart bracelets and smart watches, the company added the AON (Always On) module to “Huangshan No. 1” to achieve a lower System power consumption, faster storage performance, and accelerated localized AI task processing by integrating neural network acceleration modules. The realization of the above functions makes the “Huangshan No. 1” based on RISC-V very competitive in the wearable device market, and with the release of Huami AMAZFIT smartwatch 2 and other devices, the “Huangshan No. 1” chip is also smooth. Commercialization has been completed.

Huangshan 2S is an upgraded version of “Huangshan No. 2”. The large-core computing efficiency is increased by 18%, and the operating power consumption of small cores is reduced by 56%. It also integrates a 2.5D GPU, and the image processing efficiency is higher than that of “Huangshan No. 2”. 67%, and with the optimized algorithm, Huangshan 2S sleep power consumption has been reduced by 93%, reaching the international leading level.

The above is the application of smart watches. Let’s take a look at another popular application, TWS earphones. The main manufacturers are Andes Technology, UNISOC and Lanxun.

Everyone knows that Andes Technology is the core, but the company has publicly stated that it is optimistic about the application of RISC-V in the field of TWS headsets, and has also specially launched RISC-V solutions suitable for this field. This solution integrates D25 and customer extensible commands (Andes Custom Extension; ACE), which can be widely used in voice, audio, image processing and other applications.

Ziguang Zhanrui has long been optimistic about the development of TWS headphones, and launched the quite interesting Ivy 5882 in 2019. The chip adopts the TWS Bluetooth headset technology independently developed by UNISOC, and solves the delay problem of Bluetooth audio through the audio device group solution. Compared with the competing TWS solutions on the market, Ivy 5882 reduces the delay of both ears by more than 30%, truly achieving ultra-low delay. To sum up, the main competitive advantages of the Ivy 5882 when it was released at the time were regardless of the main and auxiliary ears, low power consumption and long battery life, ultra-low latency and good noise shielding technology.

Looking at Lanxun, the company mentioned in the prospectus that the company immediately adopted the RISC-V instruction set architecture as a technology development route to develop and design chips. The instruction set tool chain is complete, modularly designed, and has design Simple, open source and free. At present, in terms of TWS headphones, Lanxun has the BT892x series, AB561x series and BT889x series based on RISC-V. The first two series use 40nm process, and the BT889x series use 55nm process.

In addition to Huami Technology, Ziguang Zhanrui and Zhongke Lanxun, Telink Micro has also done a good job in introducing RISC-V into the field of wearable devices. The company is committed to providing wearable devices based on RISC-V. Wireless connected products.

As can be seen in Telink Micro’s application solution page, TLSR921x and TLSR951x are both wireless connection chips based on RISC-V, which are suitable for the field of hearable and wearable devices. According to public information, Telink Micro TLSR 9 series integrates a 32-bit RISC-V MCU (Andes D25 core), the standard version runs at a maximum speed of 96MHz, supports a 5-stage pipeline, and has a computing power of 2.59 DMIPS/MHz. 3.54/MHz, and also integrates DSP extension instructions and floating-point operation modules to facilitate the development of audio algorithms and Sensor algorithms.

Facing the future, although the current wearable device market has encountered some challenges, the future prospects are still optimistic. Whether it is chip manufacturers or equipment manufacturers, wearable devices are given high priority, basically surpassing smartphones. second to automotive applications. Wearable devices are a typical AIoT application scenario, and RISC-V is a new star in this field. With the advantages of open source, low power consumption, low cost, and modularity, it is believed that more and more manufacturers will choose to build based on RISC-V. Wearable Chip.

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