SiliconWisdom SWU254N Hall Switch And SWD1811A IC In AWEI T29 Pro Earbuds

When using TWS true wireless earbuds, with the phone’s Bluetooth turned on, simply opening the earphone case usually allows the earbuds to connect to previously paired devices, eliminating the hassle of re-establishing the connection. This feature is made possible by the application of the Hall sensor, providing users with a smooth connection experience due to its high precision performance.

Recently, I Love Audio Network disassembled the AWEI T29 Pro true wireless earbuds and found that its charging case is equipped with the SiliconWisdom SWU254N N-channel ultra-low-power Hall effect switch, which enables the earbuds’ open-to-connect feature; the earbuds themselves are equipped with the SiliconWisdom SWD1811A lithium battery protection IC, which protects the battery from overcharging, over-discharging, and over-current anomalies.

The AWEI T29 Pro true wireless earbuds’ charging case contains two vertical PCB boards, with a colorful light board carrying 8 RGB light beads, and the SiliconWisdom SWU254N N-channel ultra-low-power Hall effect switch for the open-to-connect feature. The main board is equipped with a Bluetooth earphone charging case SoC that integrates both charging and discharging modules. The charging case has a built-in 300mAh capacity battery.

The SiliconWisdom SWU254N N-channel ultra-low-power Hall effect switch is a micro-power, high-sensitivity N-channel unipolar Hall switch sensor device. Its internal circuit includes a Hall plate, voltage regulation module, signal amplification processing module, dynamic offset cancellation module, and CMOS output stage.

The SWU254N utilizes advanced Bi-CMOS technology, optimizing the circuit structure for extremely low input error feedback; it employs dynamic offset cancellation technology to eliminate offset voltage caused by packaging stress, thermal stress, and temperature gradients, improving device consistency. Notably, this product features a miniaturized packaging technology that enhances performance and market competitiveness.

Detailed information about the SiliconWisdom SWU254N.

According to the disassembly by I Love Audio Network, brands such as Baseus, SANAG, HiBy, iWalk, and VANKYO have adopted SiliconWisdom’s products in their TWS earbuds.

The AWEI T29 Pro true wireless earbuds have a built-in 45mAh lithium battery, equipped with the SiliconWisdom SWD1811A lithium battery protection IC, which protects against overcharging, over-discharging, and over-current. The earbuds feature a Bluetooth audio SoC that supports Bluetooth 5.3, AAC decoding, and single/dual microphone noise reduction, along with a MEMS microphone for voice call pickup.

The SiliconWisdom SWD1811A lithium battery protection IC incorporates a high-precision voltage detection circuit, a delay circuit, and a MOSFET for protecting single lithium batteries/lithium polymer batteries from overcharging, over-discharging, and over-current. The product adopts a DFN1x1-4L small package, suitable for space-constrained TWS earbud products.

Detailed information about the SiliconWisdom SWD1811A.

The AWEI T29 Pro true wireless earbuds feature a futuristic design with seven colors of RGB breathing lights, making the overall shape eye-catching. The charging case has a rounded rectangular design, while the body is made of transparent material with a blue-gray matte coating to obscure light, creating an electric pattern effect. The earbuds have a stem-style in-ear design, with a smooth texture and a weight of only 3.9g, ensuring comfortable wear.

The earbuds utilize a 10mm dynamic driver with a titanium-coated diaphragm, effectively broadening the sound range and achieving a wider soundstage with high fidelity. Supporting Bluetooth 5.1, they also feature a low-latency gaming mode, touch controls, and a single charge lasting up to 7 hours. Additionally, they are rated IP67 for dust and water resistance, effectively resisting sweat and rain.

Besides the Hall switch sensor and lithium battery protection IC discussed in this article, SiliconWisdom has also launched the following products to provide lithium battery protection, charge/discharge management, over-voltage and over-current protection, connection sensing, and touch control for Bluetooth earbuds, as shown in the image below:

I Love Audio Network Summary

TWS earbuds are one of the most popular consumer electronics products today, playing an extremely important role in the smartphone era, and their intelligent and easy-to-use features rely on various components. Through the disassembly of the AWEI T29 Pro true wireless earbuds, we uncovered the secret behind the open-to-connect feature—the Hall switch sensor device, combined with the lithium battery management IC from SiliconWisdom, enhances the usability of the earbuds.

SiliconWisdom Co., Ltd. was established in 2010, with team members possessing years of experience in semiconductor discrete device R&D and packaging. The company began engaging in analog integrated circuit R&D projects in 2015, currently headquartered in Longhua New District, Shenzhen, with sales support centers established, showcasing leading domestic R&D capabilities, with R&D teams also located in Taiwan and Shanghai.

Over the past decade, SiliconWisdom has closely collaborated with various industry clients, accumulating numerous core technologies in circuit design, semiconductor devices and process design, and reliability design. In power management applications, it has developed many high-performance product series for lithium battery protection, charge/discharge management, over-voltage and over-current protection, and buck-boost management, as well as launched cost-effective products like digital decoding protocol chips and touch sensing chips. In the TWS industry, SiliconWisdom’s magnetic sensor chips (Hall switch chips) are leading in the industry.