On June 11, 2015, Uni-President Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary Pinjia has launched NXP Smart Audio audio chips-TFA9890 / TFA9897. This IC can provide more than 3.6 W RMS power (previously limited to 0.5 W) for micro speakers, which will bring higher volume, thicker bass and better sound quality to mobile phones, portable music players and tablet computers without There is a risk of damaging the speakers. TFA9890 & TFA9897 integrates intelligent CoolFlux DSP, its function is to protect the horn safely and effectively even if it has been in the near-peak output state.
Picture 1-NFA's TFA9890 / TFA9897 photo of the agent of UPU
With the rise of smart phones, its lighter, thinner, smarter, and more power-saving features have brought great challenges to the improvement of mobile phone sound quality. The Smart Audio audio solution proposed by NXP Semiconductors, represented by UGA Pinjia, has brought a real change. The revolutionary embedded algorithm in NXP's new audio system can increase the output power of micro speakers by more than 5 times, thereby greatly improving the sound quality of mobile devices and effectively protecting the speakers.
Figure 2-The block diagram of NFP's TFA9890 / TFA9897 program of the agent of Daliandapinjia
Advantages of TFA9890 / TFA9897:
• Embedded processor
• With I2C and I2S for easy integration
• Class D——amplifier
• Integrated current check
• Very Small SoluTIon
Figure 3-NFA TFA TFA9890 hardware circuit block diagram of the agent of Daliandapinjia 
Figure 4-NFA's TFA9897 hardware circuit block diagram of the agent
Introduction of important features:
NXP monitors the working status of speakers in real time:
• Speaker temperature
• Film shift
• Power amplifier cutting
Real-time status purposes:
• Speaker protection
• Optimize audio features
Class D-the role of amplifier:
• Current check feedback system
• CoolFlux Audio DSP
Adaptive speaker mode:
According to the acoustic environment adaptive change mode, the following types are supported:
• Enclosed sound cavity
• Reflective sound cavity
• Open speaker
Because Smart PA is a chip with integrated DC / DC booster circuit, CLASS-D amplifier and smart speaker protection function, the connection of circuit diagram, the selection of chip peripheral devices and the PCB layout and wiring must meet the requirements to achieve better performance.
Figure 5-NXP's TFA9890 / TFA9897 development kit Demo Board represented by Dalian Dapinjia 
Picture 6-Successful case of NFP's TFA9890 / TFA9897 represented by the General Assembly Pinjia
About General Assembly Holdings:
General Assembly Holdings is the world's first semiconductor component distributor with a leading market share in the Asia-Pacific region. Headquartered in Taipei (TSE: 3702), it owns World Peace, Pinjia, Quanding and Youshang, and has nearly 6,000 employees. There are more than 250 agents and product suppliers, and more than 120 distribution locations worldwide (about 70 in the Asia-Pacific region). In 2014, the turnover reached 14.9 billion US dollars (self-consolidation). (* Market rankings are based on data published by Gartner)
General Assembly Holdings creates an industrial holding platform, continuously optimizes the front-end marketing and logistics support team, plays a professional partner in the industrial supply chain, and provides demand creation (Demand CreaTIon), turnkey solutions (Turnkey SoluTIon), technical support, warehousing logistics and IC Value-added services such as e-commerce meet the needs of different customers such as original equipment manufacturers (OEM), original design manufacturers (ODM), electronic manufacturing service providers (EMS), and small and medium-sized enterprises. With its international operation scale and localized sales channels, it has been cultivating the Asia-Pacific market for a long time, and has been selected as the "Best IC Distributor in Asia" by professional media.
In order to improve the localized service quality of the General Assembly and meet the differentiated needs of customers in the service area of ​​the Greater China Region, the six major areas of service provided by the General Assembly (China) include China-Based Manufacturers and Taiwan-Based Manufacturers ), Foreign (Electronic Manufacturing Service), Japanese (Japan-Based Manufacturers), Korean (Korea-Based Manufacturers) and Hong Kong (HongKong-Based Manufacturers) customers. In addition to providing customers with the best turnkey solution (Turnkey SoluTIon), and to meet the customer's small-batch component procurement needs, a specially-designed small-quantity service team (SQS, Small Quantity Service) was established. The General Assembly has established the General Assembly and Commerce, the General Assembly and Commerce (Shenzhen) and the General Assembly and Electronics (Hong Kong) in the Mainland and Hong Kong respectively. Taking "Industry First Choice. Channel Benchmarking" as the corporate vision, the company has fully implemented the "team, integrity, The core values ​​of "professionalism and efficiency", with professional services, achieve mutual benefit and win-win for suppliers, customers and shareholders.
Take a deep breath, close your eyes, the world has the freshest oxygen ...
Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier Air Cleaner Home air purifeir sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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