HUAWEI FreeBuds 6i continues the appearance design of the previous model, providing comfortable and stable wearing. Equipped with an 11mm four-magnet dynamic driver, the driving force is increased by 50%, the low-frequency extends to 14Hz, presents a more surging bass effect, and has obtained Hi-Res AUDIO WIRELESS certification. The app is equipped with multiple sound modes and supports 10-band equalizer custom adjustment to provide a personalized experience.
Huawei FreeBuds 6i has upgraded Smart Dynamic Noise Cancellation 3.0, with an average noise cancellation depth of up to 27dB in the entire frequency band; the ANC bandwidth is up to 5kHz, and the noise cancellation performance has been improved by 100% compared to HUAWEI FreeBuds 5i, providing a more immersive audio experience. It supports 3-MIC AI noise cancellation calls, and cooperates with the neural network call algorithm to accurately distinguish and eliminate noise. The single battery life is up to 8 hours, and the comprehensive battery life is about 35 hours. It supports fast charging function, and you can listen to music for 4 hours after charging for 10 minutes.
We have previously disassembled Huawei products including: HUAWEI WATCH FIT 3, HUAWEI WATCH Buds, HUAWEI WATCH GT Cyber, HUAWEI WATCH GT3, Huawei FreeClip, Huawei FreeBuds Pro 3, Huawei FreeBuds SE 2, Huawei FreeBuds 5, Huawei FreeBuds Studio, Huawei FreeLace Pro 2, Huawei FreeLace Pro, Huawei FreeLace, Huawei Sound SE, Huawei Sound Joy, Huawei MateBook X Pro 2024, etc.
01/ HUAWEI FreeBuds 6i Charging Case Teardown
Disassemble the charging case shell and take out the charging bin structure.
The charging bin side structure fixes the motherboard with screws and metal pressure plates. An FPC is set to weld with the motherboard.
The LED indicator light set on the FPC is sealed with a hood on the periphery.
The Hall element structure at the end of the FPC is fixed with a hot melt column.
The bluetooth pairing function button on the FPC on the right side of the charging bin.
The battery structure is set on the other side of the charging bin.
Take out the battery, weld the battery wire to the motherboard, and apply glue for protection.
Take out the motherboard and FPC on the charging bin.
The charging case has a built-in lithium-ion polymer battery model: HB751835ENW-11, battery parameters: 510mAh/1.97Wh/3.87V, charging limit voltage: 4.45V, made in China.
Tear off the external insulation protection, the information printed on the internal battery core, the battery comes from ATL.
The FPC circuit.
The metal dome for charging earbuds.
The Hall element with silkscreen AG3y is used to sense the magnetic field changes in the charging case lid state, and then notify the charging case MCU and earbuds to pair or disconnect with the connected device, realizing the open cover connection function.
The circuit on one side of the charging case motherboard.
The circuit on the other side of the charging case motherboard.
SGMICRO SGM41519 is a battery charger and system power path management device with integrated converter and power switch for single-cell Li-ion or Li-polymer batteries. This highly integrated 3A device is capable of fast charging and supports a wide input voltage range suitable for smartphones, tablets and portable systems. I2C programming makes it a very flexible power and charger design solution.
Nations N32G432CBL7 MCU. The N32G432 series uses a 32-bit ARM Cortex-M4F core with a maximum operating frequency of 108MHz, supports floating-point operations and DSP instructions, integrates up to 128KB embedded encrypted Flash, 32KB SRAM, and integrates a wealth of high-performance analog devices. Built-in 1 12bit 5Msps ADC, 1 12bit 1Msps DAC, integrated multi-channel U(S)ART, I2C, SPI, USB, CAN communication interfaces, built-in cryptographic algorithm hardware acceleration engine.
IC with silkscreen RZP HDK.
WillSemi ESD56241D TVS protection tube. The ESD56241DXX series is a transient voltage suppressor designed to protect power interfaces with high surge capability, suitable for replacing multiple discrete components in portable electronic devices. It adopts DFN2x2-3L package, and the standard product is lead-free and halogen-free.
IC with silkscreen ED and W12.
IC with silkscreen AH and AL Cy.
02/ HUAWEI FreeBuds 6i Earbuds Teardown
Remove the back cover of the earbud stem. The bluetooth antenna and touch detection sensor are set inside the cover. The motherboard is set inside the earbud stem cavity and connected to the FPC through the BTB connector.
Pick up the connector and take out the motherboard.
FPC connects to the BTB connector of the motherboard.
The circuit on one side of the earbud motherboard.
The circuit on the other side of the earbud motherboard.
The lithium battery charging IC with silkscreen 3GP4.
BES BES2700ZP bluetooth audio SoC, used for wireless connection and audio data processing.
The MEMS microphone of laser engraving G116 4ZWJ is used for voice calls and noise cancellation pickup.
The MEMS microphone of laser engraving G495 3ZVG is used for noise cancellation pickup. The two external ear microphones collect environmental noise together, and the in-ear microphone captures the noise in the ear canal, which increases the collection accuracy by 50%, thereby greatly optimizing the mid- and low-frequency noise cancellation effect.
BTB connector connected to FPC.
IC with silkscreen AG 3o.
24.000MHz crystal oscillator, used to provide clock.
Disassemble the earbud head. The battery is fixed inside the front cavity by a bracket, and there is a lot of glue sealing. There is a magnet inside the back cavity for adsorption and fixation with the charging case.
Take out the earbud battery. The right side is the cavity bracket structure, which is also the “resonance muffler” structure. According to the official introduction, the “resonance muffler” designed based on the Helmholtz resonance principle absorbs and attenuates the external environmental noise, can absorb the external mid-high frequency noise, and reduce the surrounding noisy sound entering the ear.
Take out the bracket and speaker unit.
Earbud speaker – According to the official introduction, it uses an 11mm four-magnet dynamic driver. Compared with the previous model, the driving force is increased by 50%, and the low frequency extends to 14Hz, bringing fuller bass performance. The low-frequency response ability is increased by 50% compared with the previous model, and it can emit reverse sound waves for multi-band noise, bringing better noise cancellation effect.
After actual measurement, the speaker diameter is about 11mm, which is consistent with the official propaganda.
The bottom structure of the front cavity, with an in-ear microphone fixed by a bracket. The in-ear detection sensor on the cavity wall is fixed by a metal plate and a positioning column.
Remove the in-ear detection sensor. The optical in-ear detection sensor is used to automatically pause the music playback when the earbud is removed, and automatically resume the music playback function after wearing.
Remove the microphone inside the front cavity. The MEMS microphone of the laser engraving G493 3ZTD is used to pick up noise from inside the ear canal.
Built-in steel shell button battery and FPC circuit.
Battery rated capacity: 55.5mAh, nominal voltage: 3.89V, charging limit voltage: 4.48V.
The battery FPC board circuit uses multiple Sunlord SDCL0603Q series multilayer ceramic inductors. This product achieves high Q value and high self-resonant frequency (SRF) through carefully designed coils and electrodes. Made by laminated dry process, it can provide high-precision and high-consistency products to meet the stringent requirements of precision electronic components.
Integrated lithium battery protection IC with silk screen ZFLA.
All components of HUAWEI FreeBuds 6i ANC wireless earphones.
03/ Summary
HUAWEI FreeBuds 6i continues the appearance design of the series, with an oval charging case, which is small and light, easy to carry. Plus, the matte texture is not easy to get fingerprints and scratches. The earbuds are designed with a smooth glossy surface and come with three different sizes of skin-friendly silicone eartips, providing a comfortable and stable fit.
The built-in battery capacity of the charging case has been increased to 510mAh, and it uses a Nations N32G432CBL7 microcontroller to control the entire device. It is also equipped with a WillSemi ESD56241D TVS protection tube and a magnetic Hall switch.
The earbud has a built-in 55.5mAh steel button battery, an 11mm four-magnet dynamic driver and three MEMS microphones. They use an optical in-ear detection sensor to achieve automatic pause/play function. They use the BES BES2700ZP bluetooth audio SoC for wireless connection and audio data processing. They are also equipped with components such as the Sunlord SDCL0603Q series multilayer ceramic inductor.
PS: Translated from 52audio
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