HUAWEI FreeClip adopts a minimalist geometric design, which combines all-weather comfort and fashionable accessories. The headphone is equipped with 10.8mm dual magnetic circuit high-sensitivity drivers to provide strong power and reduce sound spillage through directional sound waves. It has three built-in microphones (call Mic + bone conduction Mic + windproof Mic), supports deep neural network (DNN) algorithm, and is designed with a windproof structure to ensure clear call effects in all scenarios.

Huawei FreeClip supports the adaptive left and right channel function – the two headphones are exactly the same, and there is no need to distinguish left and right when wearing them. Supports multi-area touch control, dual-device connection, offline search, audio sharing and other functions. The headphones have a single battery life of up to 8 hours, and the combined battery life of about 36 hours. Supports fast charging and wireless charging.

We have also teardown the HUAWEI products including: Huawei FreeBuds Pro 3, Huawei FreeBuds SE 2, Huawei FreeBuds Pro 2+, Huawei FreeBuds Pro 2, Huawei FreeBuds 5, Huawei FreeBuds 4E, Huawei Sound SE, Huawei Sound Joy, HUAWEI WATCH Buds , HUAWEI WATCH GT Cyber, HUAWEI WATCH GT3 and Huawei Band 7. Let’s take a look at the detailed teardown report of Huawei FreeClip.

01/ HUAWEI FreeClip Charging Case Teardown

Disassemble the charging case shell and take out the charging bin structure. The charging bin fixes all components through brackets.

The front structure of the charging bin is fixed with an indicator light FPC.

The structure on the back of the charging bin is equipped with a wireless charging receiving coil.

The bottom of the charging bin holds the motherboard and speaker.

Remove the screws, open the FPC connector, and separate the charging bin back bracket and speaker structure.

The bottom structure of the charging bin has an FPC connected to the metal connector, indicator light, Hall element and Bluetooth pairing button for charging the headphones.

Remove the FPC and set up a large area magnet at the bottom of the charging bin to ensure the stable fixation of the headphones.

The circuit on the FPC side.

The circuit on the other side of the FPC.

Pogo Pin connector for charging the headphones.

LED indicator for feedback on bluetooth pairing and charging status.

Micro button for bluetooth pairing.

The hall element of silk screen AJ0T1 is used to sense the magnetic field changes when the charging case is turned on/off, and then notify the charging case MCU/earphones to pair or disconnect with the connected device.

The BTB connector that connects the FPC to the motherboard.

The motherboard structure on one side of the bracket.

Take out the speaker. The charging case has a built-in square speaker, which is used to sound reminders for finding functions.

On the back of the speaker, it is connected to the motherboard through contacts.

After actual measurement, the length of the speaker is about 15mm and the width is about 6mm.

The other side of the stand is protected by a sponge pad and has a battery inside.

Remove the motherboard, battery and wireless charging receiving coil from the bracket.

The circuit on one side of the charging case motherboard is protected by a shielding cover on some circuits.

The circuit on the other side of the charging case motherboard.

FPC bluetooth antenna for communicating with mobile phones.

ConvenientPower CPS4019 high-efficiency wireless charging reception chip supports 5W wireless charging reception. The chip integrates a synchronous rectifier and a low-dropout voltage regulator to charge system equipment and batteries, providing a good experience for built-in battery-powered devices.

CPS4019 integrates an 8051 core, built-in 16KB MTP memory and 2KB SRAM. Supports advanced power management and ultra-low standby power consumption. The chip has I²C pins and GPIO pins to support output voltage adjustment. Built-in 12-bit ADC for input and output of all parameter acquisition. The chip has built-in rectifier overvoltage protection, LDO overcurrent protection and overheating protection, and is packaged in WLCSP-30.

Silk screen YCQA IC.

Silk screen 4616 IC.

Renesas DA9168 battery charging management chip has built-in dual independent LDO and reverse boost functions. Supports the USB On-The-Go (USB-OTG) standard, has extremely low quiescent current consumption and a very compact footprint, making it ideal for a large number of space-conscious battery-powered consumer product applications.

Silk screen P14 MOS tube.

Silk screen H23 MOS tube.

Connect to the BTB connector of the FPC.

After removing the shielding cover, the circuit below.

Southchip SC8753 is an efficient direct charging chip specially designed for charging cases. The device is paired with the Southchip SC7289 linear charging chip (headphone side) to enable charging or bidirectional UART communication via a 2-contact connection. A total of two chips charge two headphones respectively.

Silk screen 2670F04UHMTB wireless SoC is used for wireless communication with mobile phones to implement search functions.

The crystal oscillator that provides the clock for the wireless SoC.

Silk screen NZDX9F IC.

Silk screen ED 6 IC.

Silk screen 3241 IC.

The charging case has a built-in lithium-ion polymer battery, model: HB751834ENW-11, 510mAh/1.97Wh/3.87V, made in China.

Tear off the outer insulation protection and see the silk screen information on the inner battery cell, from ATL.

02/ HUAWEI FreeClip Headphones Teardown

First dismantle the comfortable bean cavity (bean-shaped battery system) – a large amount of glue is sealed inside to achieve IP54 waterproofing.

The internal structure of the comfortable bean cavity houses the battery.

The inner structure of the comfortable bean cover is equipped with a main board.

Disconnect the FPC and remove the battery.

The headphone uses a steel shell button battery, model: HB110580ENW-11. Battery rated capacity: 55.5mAh, charging limit voltage: 4.48V, nominal voltage: 3.89V.

The internal structure of the comfort bean cavity has FPC wires connecting the sound cavity components. The FPC is equipped with a windproof microphone and charging contacts.

A metal connector used to connect the charging case to charge the built-in battery.

Laser Engraving G494 3QHP MEMS microphone, used for voice call function pickup.

Take out the motherboard inside the cover. Below is the BTB connector connecting the internal FPC to the motherboard. There is a bluetooth antenna attached to the inside of the left cover.

The circuit on one side of the headphone motherboard.

The circuit on the other side of the headphone motherboard.

The headphones are equipped with WUQi WQ7036AX bluetooth audio SoC. As the most critical component of bluetooth headphones, the WQ7036 series chips have groundbreaking architectural innovations and leading system power consumption levels, and form a system-level application solution based on key features of the headphones.

The WQ7036 series is WUQi’s new generation of high-end bluetooth audio chips. Based on the previous generation, it has completely upgraded the underlying software and hardware solutions and built a more open Open DSP application ecosystem. It has powerful platform capabilities and leading performance advantages – including multi-protocol compatibility. Supports Bluetooth BT/BLE5.3 dual-mode mode and bluetooth multi-connection. Supports bluetooth broadcast Auracast (audio sharing that coexists with classic bluetooth). Supports LE Audio new technology standards and LC3 codec. Excellent radio frequency performance – the transmit power reaches up to 15dBm, and the receiving sensitivity reaches -99dBm. High-performance audio algorithm – supports adaptive Hybrid ANC and various uplink and downlink complex audio algorithms. Ultra-low power consumption level – Complex audio algorithms while still maintaining ultra-low power consumption. Rich ecosystem – larger SRAM and FLASH space to achieve wider coverage of application features. Open platform – supports more product forms.

The crystal oscillator that provides the clock for the bluetooth audio SoC.

ST LSM6DSV16BX 6-axis IMU, bone conduction two-in-one chip – used for tapping control and bone conduction call noise reduction function.

Connect to the BTB connector of the FPC.

Silk screen AG 3r IC.

Southchip SC7289 linear charging IC with system power path management and I2C interface for portable applications with limited space.

Silk screen integrated lithium battery protection IC.

Disassemble the listening ball cavity. There is a bracket inside the rear cavity to fix the FPC, which is sealed with a large amount of glue.

Take out the FPC inside the back cavity. The FPC is welded to the motherboard wires and is equipped with a bone conduction microphone and a wearing detection sensor. The bone conduction VPU with silk screen QR code is used to accurately identify bone conduction vibration sounds and improve the sound pickup effect.

Capacitive wearing detection sensor is used to automatically pause playback when taking off the headphones and automatically resume playback after wearing them.

Take out the front cavity internal speaker. The bottom structure of the front cavity is equipped with a call microphone on the FPC.

The laser-engraved G455 3QBG MEMS microphone is used to pick up human voices for voice call functions.

The diaphragm of the dual magnetic circuit high-sensitivity speaker was damaged during the disassembly process.

On the back of the speaker, there is a tuning hole in the middle, which is protected by a wire mesh.

After actual measurement, the speaker diameter is approximately 10.8mm.

All components of HUAWEI FreeClip open-ear headphones.

03/ Summary

The overall size of HUAWEI FreeClip is very small and light – the charging case adopts frosted processing technology, the body is rounded and the texture is excellent. The clip-ear headphones adopt a C-bridge design, which is minimalist in style and stylish and elegant to wear. At the same time, the structure is optimized based on the principles of ergonomics to bring a comfortable and stable open listening experience.

The charging case is equipped with a 510mAh lithium battery, and the battery cells are from ATL. It uses ConvenientPower CPS4019 high-efficiency wireless charging receiving chip, Renesas DA9168 battery charging management chip, and two Southchip SC8753 high-efficiency direct charging chips responsible for charging the headphones. It is also equipped with a wireless SoC for communicating with mobile phones to implement finding function. A built-in square speaker is used to sound reminders for finding function.

In terms of the internal configuration of the headphones, the listening ball is equipped with a 10.8mm dual magnetic circuit high-sensitivity driver, a bone conduction microphone and a call microphone. The comfortable bean has a built-in 55.5mAh steel case button battery, windproof microphone and motherboard. The motherboard is equipped with WUQi WQ7036AX bluetooth audio SoC, using ST LSM6DSV16BX 6-axis IMU, bone conduction 2-in-1 chip, Southchip SC7289 linear charging IC, etc.

PS: Translated from 52audio


Huawei FreeClip’s technological breakthroughs in appearance design, wearing experience, and acoustic system demonstrate Huawei’s emphasis on consumer wishes and Huawei’s strength as a technological innovator.

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