OBC (Onboard charger), i.e., onboard charger, is generally a low-power charger; DCDC (DC - DC converter) is a device that changes the electrical energy of one voltage value into the electrical energy of another voltage value in a DC circuit, i.e., it converts a DC voltage into another DC voltage4.

DSP sound module is a kind of integrated digital signal processing (Digital Signal Processing, DSP) technology audio processing module, mainly used to adjust the audio signal frequency response, equalization, compression, delay and other parameters, in order to improve the sound quality and control the audio output.5 The core of the DSP sound module lies in its powerful processing capabilities, able to make fine adjustments to the audio signal to achieve better sound effects. adjustments to the audio signal, thus realizing a better quality sound effect.

The full name of the Fascia Gun is Myofascial Relaxation Massage Gun (English name: Fasciagun), which is based on the principle of massaging the fascia through the high-frequency vibration generated by the motor to reduce the adhesion and knots between the muscle and the fascia, to alleviate the muscle aches and pains, and to reduce the sports injuries and the lactic acid buildup. Below is information about the Fasciagun program: The principle of the fascia gun program is very simple, it controls the high-frequency motor through the microcontroller PWM square wave signal to produce a variety of vibration modes, through the massage head to act on the muscles, to promote local muscle blood circulation as well as relaxation of the muscle effect. Square wave signal is characterized by simple control and powerful motor. The disadvantage is that the sound is large, the highest speed is difficult to break through 100,000 rpm. The main control chip of this fascia gun program adopts 32-bit microcontroller KYLIN32a, and the vibration mode can be adjusted in 3 gears by touching the button. Timer shutdown function, scientific calculation of massage time. Pressure sensor function to prevent excessive pressure. Fascia gun program PCBA involves a number of technical areas in electronic engineering, including power management, motor control, microcontroller applications and circuit design. The following is a detailed explanation of several key knowledge points: 1. 5V Boost 12.6V Chip: The FS4059C is a .... Write a functional program through the software Battery power: 1.5v2A2. point amount of indication: the voltage is higher than 10V when the green light amount, the voltage is lower than 10V on the yellow light, the voltage is lower than 9.0V on the red light, the voltage is lower than 8.0V product disconnect.3. charging process indicator light red light flashes, the charging voltage up to 12.6V green light is always on, and at the same time to stop charging.4. charging time: from the red light of the battery is on to the full charge Completion time is about 2 hours. 5. The motor can not be started under the charging state. Working mode: 1. 4 gears in total. 2. 1600 rpm in first gear, 2100 rpm in second gear, 2600 rpm in third gear, 3100 rpm in fourth gear. 3. Long press 2S to turn on the machine, the first gear will start to work, and the indicator light of the first gear will be on. Then press the second gear work, the second gear indicator light. Press again to work in third gear. From the technical principle, in fact, the main control of the fascia gun many domestic MCU can play, mainly 20pin 003 series chip is enough resources. For example, in the micro 5880/6990. dynamic micro 0010 or 003 (32-bit), and so on, all of these, in fact, can be done to do the main control chip fascia gun. Most of the previous fascia gun program is the motor drive board is independent of the main control MCU performance requirements are relatively low, just to achieve the control function is good, and the motor control part, in fact, also needs a separate MCU or a dedicated motor driver chip to deal with the motor speed, start and stop, strength and so on. Such a program, characterized by the control part of the program is simple, do not have to pay attention to the algorithm of the brushless motor, the control of the brushless motor all depends on the motor driver chip algorithm to coordinate, such a program debugging cost is high, the overall cost is high.

Toy Voice IC Program Introduction VCI WT588F(C013) Voice Chip Solution Features and Functions VCI WT588F(C013) voice chip brings rich interactive experience to smart toys. Its peripheral interfaces include one-line communication and recording line. The one-line communication interface realizes fast communication between the chip and external devices, which is convenient for smart toys to expand their functions; and the recording line allows toys to have voice recording function. The main functions include voice playback, recording, voice operation by the host computer, power consumption and volume adjustment. Voice playback supports up to 127 segments of audio, supports WAV, ADPCM format, clear and beautiful sound; recording function can record the voice of the child or parent to increase the fun and interactivity of the toy; support for the host machine to create voice, suitable for customized voice requirements; hibernation power consumption is only 5 μA, energy-saving effect is excellent; the volume adjustment function allows the user to adjust the sound level according to the needs. Application program content The solution includes circuit realization principle, PCB layout and program flow. In terms of circuit realization principle, the chip is connected to a microcontroller (e.g. Arduino or RaspberryPi), utilizing its audio processing capability to realize the voice playback and recording functions, and expanding the application scenarios through the one-line communication interface to communicate with external devices. NRK3301 Offline Voice IC Solution Chip Features and Functions NRK3301 voice recognition chip is used in children's robot toys to provide offline voice interaction experience with high recognition rate, supporting 5-meter far-field recognition. It belongs to the offline voice technology, which is free of internet connection, and can process and respond to voice recognition locally.The NRK330X series adopts a highly efficient 32-bit RISC core with a number of advanced technical features. Application Effect Robot toys through the chip's voice recognition technology can allow users to talk to the toy, issue commands by voice, and complete simple tasks, which can fully stimulate and satisfy children's curiosity, and strengthen the interactive experience between consumer groups and toys. VTech Knowledge WT2003HX Speech Chip Solution Chip Features and Functions WT2003HX is a powerful and high-quality voice chip with high-performance 32-bit, maximum frequency up to 120MHz, featuring low cost, low power consumption, high reliability and strong general performance. The output supports SPK and DAC output (DAC output occupies one IO port), there is a remote control decoder and four-channel PWM output. Customers can choose the appropriate Flash according to the size of the built-in voice of the product, the audio output can be selected according to the volume requirements of the SPK or DAC output, DAC output adjustable gain, but also provide the corresponding amplifier chip and circuit. The chip is connected to a simple MIC circuit and supports up to 24K sample rate recording. Application Program Advantages In the infrared remote control toy program, the use of infrared remote control decoding, decoding up to 21 buttons, accurate decoding, fast response, but also through the PWM output to control the motor forward and reverse and speed adjustment. For battery products, low voltage can be achieved, with low battery voice announcement to remind the user to replace the battery. Its peripheral circuit is simple and low-cost, four-channel PWM output can control breathing lights, motors, servos, etc., providing more possibilities for the development of toys. CI1302 Intelligent Voice Chip Program Chip features and functions CI1302 voice chip adopts 220MHz high main frequency, larger SRAM, algorithms can be fully provided to the host application. Highly integrated, peripheral streamlining, in addition to the MIC, speaker, board level only need to resistor, PA chip. In terms of voice algorithm, 85dB strong noise can still have 85% recognition rate and 90% wake-up rate, support 300 offline command words. Application program features Adopting CI-D02GS01J voice recognition module, the module is compact in size, the working voltage is 3.6V - 5.5V, on-board amplifier, with one way microphone, one way speaker, and one way 5V power supply and UART interface, plug in the microphone and the speaker direct power supply can be used. You can log into the Qiyintailun voice AI platform for command words, wake-up words, playback tones, serial protocol changes, the platform to create the firmware and then download it to the voice module to complete product development. The program sets up light touch interaction, induction interaction and voice dialog interaction for toys, which is available anytime and anywhere without internet connection and enhances the children's experience.

Analysis of parallel connection boost protection scheme for multiple lithium batteries of sprayer Analysis of multiple lithium batteries in parallel Parallel connection of multiple lithium batteries can increase the capacity of the battery to meet the demand for continuous work of the sprayer. For example, if multiple lithium batteries with a nominal voltage of 3.7V are connected in parallel, the total voltage is still 3.7V, but the overall power storage capacity is increased. Boosting Requirements and Solutions Reasons for Boosting In some sprayer application scenarios, a higher voltage may be required to drive the spraying device for better spraying effect, such as boosting from the common 3.7V or 3.7V to 8.4V after paralleling multiple cells. Boost Converter Options Boost converters such as the PW5300 or PL7501C can be used, which are capable of converting the lower input voltage to the higher output voltage needed to meet the operational requirements of the sprayer. Protection Functions and Realization Options Importance of protection function During the use of multi-cell lithium batteries, over-charging, over-discharging, over-current and reverse connection may cause damage to the battery, and even cause safety problems, so there must be appropriate protection measures. Protection circuit design Protection chip selection Design of multi-cell lithium protection circuit, according to the actual requirements and functions of the selected protection chip, such as for two lithium battery protection can choose HY2120, PL7022 and other protection chips, through the protection chip to the peripheral circuit design. Overcurrent protection The overcurrent protection threshold of the protection chip circuit is usually determined by the switching MOS tubes, such as 8205A8TS, if you think that the overcurrent threshold is small, you can operate multiple MOS tubes in parallel to increase the overcurrent current. Charge and Discharge and Voltage Regulation Connect the lithium battery protection chip circuit and charging circuit together to form a charging and discharging circuit, together with the lithium battery output circuit, it can realize the function of charging and discharging at the same time. At the same time, because the supply voltage of Li-ion battery is not fixed and constant, it is necessary to use a step-down or step-up DC-DC chip or LDO to achieve the required voltage. For example, PW2162, input 4V - 16V, output current 2A, adjustable output; PW6206, input 3V - 40V, LDO linear, output 3V, 3.3V, 5V. Other Related Chips PL5920 This is a synchronous step-down DC/DC converter providing a wide input range of 4.5V to 21V with fault protection including week-by-week current limit, UVLO, output overvoltage, etc. The device uses a current-mode control scheme to provide an adjustable output. The device utilizes a current mode control scheme to provide fast transient response, and the internal compensation feature reduces external compensation components and simplifies the design process. In shutdown mode, the supply current is less than 1μA. FS4059 Series FS4059A: 5V2A input boost charging 8.4V1A to dual-cell lithium battery charging chip, input small current will not pull dead, built-in adaptive loop, you can intelligently adjust the charging current to prevent pulling the adapter, but also has the output over-voltage short-circuit protection, short-circuit protection of the input under-voltage, the chip is over-temperature protection and other functions. FS4059B: 5V2A input boost charging 8.4V1A, withstand voltage 18V, with NTC thermal temperature and current protection, using asynchronous switching architecture, the application only requires a very small number of peripheral devices, which can effectively reduce the overall program size and BOM cost. FS4059C: 5V input boost charging 12.6V1.2A charging chip for three lithium batteries, the same input small current will not pull dead, built-in adaptive loop, can be intelligently adjusted to the charging current, using 8-pin ESOP8L package type, suitable for digital cameras, MP3, MP4 players and other portable devices. Protection Chip Working Principle Main Components IC: It is the core of the protection chip, which first samples the battery voltage and then issues various commands through judgment. MOS tube: It mainly plays the role of switching. Normal operation trigger The MOS tube on the protection chip may be in the off state at the beginning, after the battery is connected to the protection chip, the MOS tube must be triggered first, and there will be output voltage only at the P + and P - terminals, and the commonly used triggering method is to use a wire to shorten the B - and P - terminals. Overcharge protection Connect a power supply higher than the battery voltage on P + and P -, when the battery voltage reaches 4.25V, IC sends out a command to make the pin CO low, MOS2 shut down, the whole circuit is shut down, the circuit plays a protective role. Over-discharge protection After connecting suitable loads to P + and P -, when the battery is discharged to 2.5V, IC samples and sends out a command to make MOS1 cut off, the circuit is disconnected and the battery is protected.

Audio Bluetooth Module IC Solutions With the development of Bluetooth technology, audio Bluetooth module IC solutions continue to emerge to meet the needs of different application scenarios. The following are some common audio Bluetooth module IC solutions: Broadcom BK3254 Wireless Bluetooth 4.1 Audio IC Solution Applicable products: stereo, headphones and other audio devices. Solution Provider: Shenzhen Zhilian Information Technology Co., Ltd, the company's main IC-related product sales and services. How to get the information: If you are interested in this program, please contact us by phone or leave a message online. In addition, you can also scan the QR code to enter the Tiger Ease small program to put business cards, to get a lot of exposure at a lower cost. ANS - BT301M Audio Bluetooth Module Solution Mixing Console Application Pain point solution: to solve the mixing console demand mobile device audio access, how to convenient and effective. Solution process: mixing console plus audio bluetooth module (ANS - BT301M); mobile device sound source through bluetooth to audio bluetooth module ANS - BT301M; bluetooth module ANS - BT301M through the analog or digital signal output to the console's main control for processing; mixing console signal processing output to the next level of equipment as an input signal. Module features: It is a BLE + SPP + Audio Bluetooth module, supports analog audio, DRC, 10-band EQ, and at the same time, it supports various functions and protocols such as BLE, SPP, AVRCP, I²S and so on. Using UART as the programming interface, customers can use AT commands to read or write the configuration of the module via UART. TWS Audio Application Function realization: Portable Bluetooth stereo can realize TWS, AUX, TF/USB, microphone and other functions by using this module. Bluetooth Mode: Power on and automatically enter Bluetooth mode, then enter Bluetooth pairing mode; there is an automatic return connection, no connection within 5 minutes, automatic shutdown. TWS Pairing Mode: In the state of no Bluetooth connection, double-click the pause button of any one unit to start or disconnect TWS, open TWS/TWS pairing successfully/TWS disconnected. AUX - IN mode: Plug and Play. TF/USB mode: The specific features of this mode are not described in detail in the text. Microphone Mode: Plug and Play with microphone inserted. RB103 (CSR8640/8645 Bluetooth 4.0) Module Stereo Bluetooth Solution Applicable products: Advanced stereo speakers, advanced stereo headphones. Supported protocols: Supports Bluetooth protocols such as music playback (A2DP), streaming control (AVRCP), hands-free calling (HFP), and so on. KT1026BTM Chip IC Module Solution Module features: Dual-mode chip IC module with integrated Bluetooth audio playback and data transmission functions, which not only supports Bluetooth audio playback function, but also supports Bluetooth low power consumption. QCC3040 Main Audio Bluetooth Module + Treadmill Bluetooth Solution Application Scenario: Mainly used in treadmills or exercise bikes, involving audio transmission and wireless control, providing a seamless and wireless exercise experience.

WIFI audio IC program related introduction Some of the WIFI audio IC program products on the market Marco Polo's BOWA/BH - BT38M01 Solution This is a program launched by Marco Polo from Zhongshan, Guangdong, China, the main products cover Bluetooth module, WIFI solutions, etc. This program can be used to design Bluetooth wireless WIFI speaker, which can bring shocking sound quality, and its speaker brand is BOWA, the model number is BH - BT38M01, and the item number is 003. SmarTone AC7911BA - QFN48 Solution This is a program for WiFi speakers launched by Jelly, PCBA hardware and software development, applicable to the field of digital home appliance IC, with a variety of functions such as microcontroller chip development, and also involved in electronic components and other aspects of the order. WiFi based wireless speaker solution development case A few years ago, we developed a WiFi based wireless speaker solution. At that time, the company's chip was used as the main chip to realize the cell phone configuration speaker connected to a wireless router, after both the cell phone and the speaker are connected to the same wireless router, the cell phone music player can play the music on the wireless speaker, and it supports pushing the local songs of the cell phone or the songs in the cloud to the speaker for playback. Supports DLNA and Airplay protocols, mainstream music players (such as QQ Music, Cool Dog Music, NetEase Cloud Music, etc.) as well as Apple music player (Airplay) can be adapted. If there are two such speakers, with the music playback APP developed by the company, the left and right channel data can be pushed to different speakers, producing a strong stereo effect. Software realization The software of the wireless speaker is developed on openWrt, the wireless related software is already available, only the audio related software needs to be developed. Audio-related mostly based on open source development, as follows: Function Use of open source tools DLNA protocol sharepoint AirPlay protocol gmediarender Music format parsing and decoding FFMPEG Audio playback ALSA Software Process The implemented process is called mediaplay, which communicates with the protocol (DLNA/AirPlay) through shared memory to realize music play, pause, stop, etc. Mediaplay calls FFMPEG API to parse the music format, decodes frame by frame to get the PCM data and puts it into the ring buffer, and then blocks the mediaplay with a mutual exclusion lock. Mediaplay registers a callback function with ALSA, which is called once every frame to take one frame of PCM data in the buffer and unlock the mutex lock, so that mediaplay continues to decode the next frame in a loop. Team Division of Labor The team consists of 4 people with a clear division of labor: ALSA leader: responsible for ALSA (including driver and ALSA - Lib calls). Responsible for the software framework: implement the mediaplay process and the control logic inside. Protocol porting leader: responsible for DLNA/AirPlay protocol porting and communication with mediaplay. FFMPEG related person in charge: responsible for FFMPEG, decoder optimization and integrating the optimized decoder library into FFMPEG, as well as post-processing (mainly EQ). Decoder optimization On the ARM chip (CPU only 500 megabytes), we investigated the required decoders (MP3/AAC/APE/OGG/WMA/FLAC/ALAC) and found that AAC/OGG/WMA were floating point implementations, which led to slower playback, so we searched for fixed-point implementations of these decoders to replace them. After optimization, the AAC fixed-point implementation library is integrated into FFMPEG, which reduces the chip running load from more than 2000 MCPS to less than 200 MCPS. Steps to add decoder library to FFMPEG Modify FFMPEG's configure. Add REGISTER_DECODER() to allcodecs.c to register this decoder. Add the adapter file (*.c) of this decoder to the libavcodec directory, and modify the makefile under libavcodec so that this adapter file can be programmed. Modify . /configure to enable the decoder, and tell the library path and header file path.

Introduction to Offline Voice Control IC Programs With the development of science and technology, offline voice control IC program has been widely used in many fields, the following for you to introduce several common programs: WTK6900H - C - 24SS Offline Speech Recognition IC Solution Application Areas: WTK6900H - C - 24SS Mainly used in eye massager, also can be used in various product fields such as player, tea bar machine, light tape, headset, dryer, neck massager, projector, eyebrow embroidery machine, hood, toilet and so on. Features Cost-effective: with more reliable wake-up recognition rate, longer distance wake-up, lower false wake-up rate, richer number of voice control instructions, stronger noise resistance, faster response recognition time. Long-distance recognition: It can realize long-distance voice recognition with a coverage range of 3 - 5 meters, allowing users to easily control the function switching of the eye massager and other products without having to get close to the device. Simplified design: No crystal oscillator is required, and the integrated crystal device simplifies the product design and reduces the cost. Personalized customization: Users can replace the words (self-learning function), can be based on personal needs, through self-learning to replace the recognition instructions, so that the product more closely match the personalized needs, to enhance the user experience. NRK3301 Speech Recognition Chip Solution Application Fields Children's safety chairs: Add this chip to children's safety chairs to realize the artificial intelligence interaction function, parents can operate by voice shouting, no need to press the remote control, no need to network, no need to download apps, direct offline can be easily operated. Smart Air Conditioner: As the core component of the Smart Air Conditioner offline voice control program, it provides offline voice control function for the air conditioner. Features Offline recognition: Users can control the relevant devices without the need for an APP or internet connection, which provides great convenience when there is no internet or you don't want to use a mobile app. Accurate recognition: Adopting advanced neural network (TDNN) algorithms, it has the advantages of high recognition accuracy and low misjudgment rate, and can reliably recognize the voice even at a distance of 5 meters. It also adopts voice noise reduction algorithm, which can filter out steady state noise and has good suppression effect on dynamic noise, ensuring that commands can be accurately recognized even in noisy environments. Low-cost and high-performance: It adopts a high-performance 32-bit RISC core and a processor with a main frequency of up to 240MHz, supports hardware floating-point operation, and has a built-in 1MB SPI FLASH, which realizes an effective combination of high-performance and low-cost. WTK6900H Offline Speech Recognition Chip Solution Application Fields WTK6900H offline voice recognition chip is commonly used in intelligent desk lamps and other lighting products, allowing consumers to enjoy a better intelligent interaction experience. Features Accurate recognition: Adopting the latest neural network algorithm, it has the advantages of accurate recognition, low misjudgment rate, and reliable recognition in 5 meters far field. Strong noise reduction ability: Adopting AI voice noise reduction algorithm, it can filter out the steady state noise, and also has a good suppression effect on dynamic noise, and can accurately recognize under the noise. High-performance configuration: High-performance 32-bit kernel, 240MHz, supports hardware floating-point operation; built-in 1MB SPI Flash. Audio decoding support: supports MP3, WAV audio decoding. Bluetooth: Compliant with Bluetooth V5.1 + BR + EDR + BLE specifications, meets Class1, class2 and class3 transmission power requirements, provides +6dbm transmit power. SZYF89 SOP16 Speech Recognition Solution Application Areas Suitable for power switch, smart home, small home appliances, medical supplies, smart toys and other fields. Features Program customization services can be provided, but the document does not mention more detailed technical characteristics, the specific transaction price may vary depending on the product to participate in the activities, the number of purchases or the specifications selected.

Alexa WIFI Module IC Program Introduction Loxin ESP32 - PICO - V3 - ZERO Module Solution Module Features Compact and integrated: ESP32 - PICO - V3 - ZERO is a small module (16×23×2.3mm) based on ESP32 - PICO - V3 system-in-package (SiP), equipped with ESP32 (ECOV3) chip, integrated with 4MB SPI Flash, crystal, filtering capacitor, and RF matching link, and built-in PCB on-board antenna. Communication features: 2.4GHz 802.11b/g/n Wi - Fi, Bluetooth and low power Bluetooth connectivity for host MCU. The host MCU can connect to the module through the UART interface. Chip Process: Based on the ESP32 (ECOV3) chip as the core, it integrates the Xtensa® dual-core 32-bit LX6 microprocessor, and utilizes TSMC's 40nm low-power process. Fully certified: Certified with FCC, CE, SRRC, IC and RCM certificates. Program Advantages Alexa Support: Provides Alexa connectivity and support features such as Frustration - Free Setup (FFS) and Dash Replenishment Service (DRS), which are built into the ESP32 - PICO - V3 - ZERO - DevKit development boards to seamlessly connect to ACK cloud services. The ESP32 - PICO - V3 - ZERO - DevKit development boards include this module, which seamlessly connects to the ACK cloud service, providing users with a solution for quickly building Alexa voice-controlled devices. Convenience: The architecture of the ACK module is designed to minimize the effort of software development and maintenance, while providing rich product functionality. The development board is pin-compatible with the Arduino Zero development board, which can be directly connected or easily connected to other motherboards and peripherals. It supports users to easily build Alexa-enabled IoT devices without the need to manage cloud services, write Alexa Skill, mobile apps or other complex devices. Modules are shipped with ACK firmware burned in and pre-configured to connect to ACK hosted cloud service licenses. Product Design Flexibility: Users can choose a certified SoC based on their product requirements and quickly design a product with minimal external components.The ESP32 and ESP32 - C3 SoCs are pre-configured to connect to the ACK module when building Alexa connected devices. KFWF - 008266 Module Solution Module Overview Functional design: It is a Wi-Fi module supporting Amazon Alexa Skill with a high-performance wireless System-on-Chip designed for users and designers who want to implement IoT and Amazon Alexa features. It not only supports common IoT applications, but is also specifically designed for Amazon's Alexa Skill function, making it a low-cost and feature-rich Wi-Fi module. Operating Modes Standalone: When working independently, it runs a specially designed program through an externally connected Flash memory, which fully supports Alexa Skill's various control protocols. Co-operation: It can also be used with an external processor to accomplish more complex Alexa Skill applications. Module Features Network protocols: supports 802.11b/g/n protocols, Wi-Fi Direct (P2P), soft-AP, integrated Alexa stack. Technical features: antenna diversity, SDIO2.0, SPI, UART support, STBC, 1x1 MIMO, 2x1 MIMO technology, 1.0mW power consumption in sleep mode (DTIM3). Protocol certification: Certified Alexa smart home protocol and Alexa customization protocol. Application Scenarios Suitable for LED controllers, LED downlights, LED table lamps, LED bulb lamps, smart switches, smart home devices, self-organizing network devices, etc. Smart WIFI Module General Program Features Module Advantage Miniaturized design: Adopting advanced packaging technology to achieve a small and exquisite design to meet the demand for compact installation in various scenarios. Low power consumption and high performance: through the optimization of chip design, it can achieve low power consumption and long working hours at the same time of high performance. External interface standards: adopting common interface standards, convenient to integrate into various smart devices and systems for rapid development. Application Scenarios Smart home: It can realize the networking and remote control of smart home devices to enhance the comfort and convenience of home life. Intelligent medical care: It can realize the data transmission and monitoring of medical equipment, and improve the level of medical technology and services. Industrial control: It plays an important role in industrial automation, realizing wireless communication and remote monitoring between devices. Development Support Development tools: Provide rich development tools, including development boards, debugging tools and development documents, to help developers quickly start development. Development process: there is a detailed development process, so that developers can easily understand the development steps and deepen their understanding of the principles. API support: provide a wealth of APIs to facilitate developers to customize the function and secondary development, to meet the needs of various types of application scenarios.

2.4G Wireless Audio Module IC Solution 2.4G Wireless Audio Solutions from Different Companies AlfaPlusSemiconductor's 2.4G Wireless Audio Solution The 2.4G wireless audio solution developed by AlfaPlusSemiconductor is an advanced audio transmission technology focused on achieving low audio latency and providing high quality connectivity for audio devices such as wireless speakers, wireless headphones and wireless microphones. The transmitter module in this solution, model DIO - T010L02, manufactured by ELANsat Technologies Inc. is designed for close-range audio transmission and supports high-quality, uncompressed digital audio signal processing with a 48kHz digital audio sampling rate. Xun Tong Technology's 2.4GHz Wireless Solution XunTong's 2.4GHz wireless solutions cover a wide range of application scenarios, including wireless headsets, remote control solutions, VOIP solutions, wireless audio solutions for LCD TVs, etc. These solutions all utilize 2.4GHz wireless audio. These solutions all use the 2.4GHz frequency band, which can be used worldwide without any obstacles, and have a high anti-interference ability. In addition, in order to meet the wireless audio transmission needs of home theater systems, it also provides 2.4GHz home theater point-to-multipoint wireless audio solutions, which support point-to-point or point-to-multipoint (e.g., 1-to-2, 1-to-4, etc.) CD-quality sound quality wireless audio transmission, eliminating the trouble of wiring, and meeting the needs of home theater systems such as 5.1, 7.1 channels, and so on. 2.4G Wireless Audio Transmission Solution from TENWAYS Tmicro has a 2.4G wireless audio transmission solution, but the search results do not mention the specific features and advantages of this solution in detail. Components of 2.4G Wireless Audio Module Solution The 2.4G wireless audio solution is mainly composed of a radio frequency (RF) module, a power management unit (PMU), a microcontroller (MCU), and an audio processing module. Among them, the RF module is responsible for wireless transmission and reception of audio signals; the power management unit (PMU) ensures stable power supply to the whole system; the microcontroller is used to control the operation of the whole system; and the audio processing module processes the audio signals to ensure the audio quality. 2.4G wireless audio module application scenarios and corresponding program features Wireless microphone, game headset, KTV microphone, musical instrument wireless transmission scenarios Taking M01 module as an example, it is a 2.4G wireless audio transmission device suitable for these scenarios, with unique software frequency hopping mechanism, which can enhance RF anti-interference and transmission distance. The module has a built-in high-performance audio converter, supports high-quality uncompressed audio transmission, and also has a microphone noise reduction function, and can replace some of the U-band and V-band wireless audio solutions. TV Wireless Audio Transmission Scenario It can realize wireless transmission of HD audio from TV set to external audio equipment, which requires the module to have good audio performance, compatibility and stability to ensure high quality audio transmission effect. Smart home, remote control, drones and other fields In these fields, 2.4G wireless communication modules can be used to realize wireless control and data transmission of various devices. For example, the module is used to realize wireless control of smart light bulbs, or image transmission on drones. For this type of application, the module needs to have stable and reliable short-range data transmission capability, fast frequency hopping calibration and other functions. Examples of module performance and specifications JF24D Module Application scope: It is suitable for wireless data transmission of MCU, data acquisition, wireless remote control, wireless mouse, wireless keyboard, wireless electronic label, wireless remote control toys, intelligent control of household electrical appliances, industrial wireless automatic control, wireless meter reading and so on. Performance introduction: it is a special small volume lower cost 2.4G wireless module, transmission rate up to 1M, with fast frequency hopping calibration and other functions, 80 channels can be set up for stable and reliable short-distance data transmission, working in the global open ISM band, free license to use the product in line with ROHS standards. Performance parameters: frequency range of 2397 - 2483Mhz, programmable output power of - 35, - 25, - 15, - 5, 0, 5 (dbM), operating voltage of 2.1 - 3.6V, modulation mode GFSK/FSK, transmit current 14mA (0dBm), the maximum rate of 1M, receive current 21mA (1Mbps), receive sensitivity of - 85dBm, sleep current is 3.5uA, maximum distance is 80 meters (remote control), 20 meters (digital transmission), standby current is 410uA, programming interface is SPI digital interface, antenna form is PCB antenna, module size is 21X12.5X2mm (LXWXT). M01 module Power supply part: supply voltage is 3.3V, consumption current is 52mA. DAC sound signal part: full output level is 1.6Vpp.

Bluetooth Loss Prevention IC Solutions Program Overview Bluetooth Loss Prevention Device Solution is a wireless positioning system based on Bluetooth technology, which is used to prevent the loss of items or track the location of items. It consists of two parts, the Loss Prevention Device and the smartphone application, which realizes the connection between the item and the cell phone through Bluetooth signal transmission, and provides real-time positioning and alarm functions. Performance Features Accurate positioning: With Bluetooth positioning function, it is more accurate, and can also be combined with GPS positioning to narrow the search range and improve the search efficiency; it can locate the position of the lost equipment to prevent any omission. Voice Alert: Adopting voice IC to broadcast alerts, with anthropomorphic voice, more natural and clearer. Real-time alarm: When the item is out of the safety range, an alarm will be issued immediately. Other advantages: with the advantages of real-time positioning, remote control, long-distance communication and strong compatibility, it can be compatible with various mainstream smartphones and tablet devices. Users can also remotely control the anti-loss device through smartphone apps to realize the functions of remotely switching on/off the device and setting alarms. Voice chip selection According to the evaluation of one-time voice chip development engineers, YSV58020A of OTP voice chip series can be used as the main control chip. Technology Realization Principle of Bluetooth technology Bluetooth is a wireless communication technology that transmits data through short-range radio waves. It has low power consumption, low cost, high reliability and a wide range of applications and is suitable for communication between various small electronic devices. Frequency Hopping Spread Spectrum (FHSS) or Time Division Multiplexing (TDM) modulation is used to achieve reliable data transmission. Hardware Design It mainly includes Bluetooth module, sensor module and power module and other parts: Bluetooth module: responsible for communicating with cell phones or other Bluetooth devices to realize remote control and data transmission of the anti-loss device. Sensor module: used to detect whether the items are lost or not, usually using UHF radio waves or ultrasonic sensors. Power supply module: provides power for the anti-loss device, usually using rechargeable lithium batteries or button batteries. Software Design It mainly includes Bluetooth communication protocol, sensor data processing algorithm and user interface: Bluetooth communication protocol: used to realize data transmission and control commands between the anti-loss device and cell phone or other Bluetooth devices. Sensor data processing algorithm: used to analyze the sensor data, determine whether the item is lost, and trigger the corresponding alarm or prompt message. User interface: Used to display the status information and operation control of the anti-loss device, usually using cell phone APP or web interface. Application Scenarios Travel and outdoor activities: can be used to prevent the loss of luggage, backpacks and other items. Home and office: Can be used to track important items such as keys, wallets, documents, etc. Pets and children: Can provide security for pets and children, convenient for parents or owners to keep track of their location. Program Advantage Functions Account-based management: Account-based management of the MAC address of the Bluetooth Loss Prevention Device provides the security of Bluetooth communication. Customized APP interface: simple and easy to understand, user-friendly operation. Customized Settings: Users can set the alarm distance and alarm ringtone by themselves through the interface of Bluetooth anti-loss device. Distance Calculation: According to the Bluetooth Loss Prevention APP, you can calculate the distance between the lost object and the Loss Prevention device by yourself, for example, judging the distance of the lost object according to the size of the ringtone. Lost and Found: If the device is lost, the next time someone is equipped with the same device, the device and the cell phone APP will sound, which is helpful for the owner to find the lost device. Group management: APP can add multiple devices for group management. Multiple management: Multiple mobile APPs can manage one Bluetooth Loss Prevention Device at the same time. Test and Verification Test environment and equipment The test environment includes indoor, outdoor, and complex environment (such as shopping malls, railway stations, etc.); the test equipment includes loss prevention device, smart phone, Bluetooth adapter, and test software. Test Content Signal Coverage: Test the signal coverage of the anti-loss device in different environments, record the effective distance and signal attenuation. Connection Speed and Stability: Test the connection speed between the Loss Prevention Device and smartphone, and the stability of the signal in the mobile state. Positioning accuracy: Test the positioning accuracy of the anti-loss device in different environments to evaluate its accuracy and error range. Function test: Verify whether the functions of the anti-loss device, such as sound alarm, vibration reminder, two-way search, etc., work properly. Result analysis and optimization Based on the test results, analyze the advantages and shortcomings of the Bluetooth solution of the anti-loss device, identify the existing problems and potential room for improvement, and put forward targeted optimization suggestions, such as improving the signal transmission technology, enhancing the positioning algorithm, etc., in order to improve the performance and user experience of the Bluetooth solution of the anti-loss device. Future Outlook Low-power Bluetooth technology: with its continuous progress, the Loss Prevention Device will be able to realize longer standby time and more stable connection. Higher versions of Bluetooth: Bluetooth 5.0 and higher versions will bring faster transmission speeds and longer communication distances, improving the performance of loss prevention devices. Application Scenario Expansion: The application scenarios in asset management and other aspects may be further expanded. Unification of technical standards: Currently, there are many Bluetooth technical standards, and in the future, there is a need to unify the standards in order to improve the compatibility and interoperability of anti-loss devices.

Wireless charging module IC program introduction MP268 Li-ion battery wireless charging special chip program Applications MP268 Li-ion battery wireless charging chip has a wide range of applications, covering wireless charging modules for game peripherals (such as wireless dual charger for wii controller battery, wireless charger for PS3 controller battery, etc.), consumer electronic products (wireless rechargeable electric shaver, wireless rechargeable electric toothbrush, etc.), and digital products (wireless cell phone charger, wireless iPhone charger, etc.). Pros. Adopts fashionable wireless charging control technology, easy to install, safe and convenient, universal finished set can be used for most small electronic products wireless power supply. Utilizing intelligent special charging detection algorithm, it automatically enters standby state after full, energy saving and safe and reliable. Able to wirelessly deliver more than 500MA high-current charging, charging low temperature. Transmitter and receiver are equipped with customized magnetic isolation and efficiency improvement magnetic isolation sheet, which comprehensively improves the efficiency of power conversion and effectively passes the international CE, FCC, ROHS and other safety certifications, which facilitates the export of products. Adopting 12bits high-precision AD, the battery charging rate reaches more than 95%, with intelligent charging index. Wireless charging module peripheral line is streamlined, only one capacitor, low cost, ready to use. Provide a full range of technology, support for personalized programs specially customized and peripheral increase in intelligent management functions. Performance Parameters Parameter Details Input voltage DC12V Input current 300mA Output Voltage DC5V Output Current 500MA or more Output power 2.5 - 4W Center Resonance Frequency 125KHz Wireless charging module transmitter-receiver distance 2 - 6mm Wireless charging module main application Wireless power supply for portable electronic products (e.g. MP3, MP4, etc.); electric toothbrush, electric razor, telephone wireless charging. XKT - 801 chip wireless charging module program Main Parameters Parameter Details Transmit voltage 24V Sensing distance 0 - 30mm Receive Output Each receive output is 5V DC voltage (can change sampling resistor to change voltage). Transmitter module size 16mm * 24mm Transmitter coil O.D. 200mm Receiver coil OD 23mm * 0.3mm wire Driving capability Multiple receivers can be used at the same time Operating range 0mm - 60mm Output current 5 - 20mA Configuration and Usage The module can be powered by the microcontroller or directly charged with a miniature battery. The module comes with 3 receivers, additional receivers are $18 each. Ingex IP6816 Integrated Qi Wireless Charger Receiver Solution Introduction of IP6816 IP6816 is a multi-functional power management SoC that integrates Qi wireless charging reception, 5V boost converter, Li-ion battery charging management, and battery level indication, providing a complete power solution for wireless charging TWS Bluetooth headset charging bin. A 5V output, synchronous rectified boost DC-DC with built-in power tubes provides 300mA output current with boost efficiency as high as 93%.The DC-DC converter switching frequency is at 1.5MHz, which can support low-cost inductors and capacitors. Features Synchronous Switching Discharge Enables 300mA synchronous boost conversion. Boost efficiency up to 93%. Built-in power path management, supports charging and discharging at the same time. Charging Provides 500mA linear charging with adjustable charging current. Support Qi protocol wireless charging receiving function. Can automatically adjust the charging current to match the adapter and wireless charging. Provides some output capacity, supports 4.20V, 4.30V, 4.35V and 4.4V batteries. Battery level display Built-in 10bitADC to accurately calculate the battery power level. Support 4/3/2/1 LED power display. ST wireless charging program chip Qi wireless charging transmitter chip IC program The power of the program is 5w, with a foreign object detection function, but the search information does not introduce more detailed parameters and features.