HUAWEI FreeBuds Pro 4 is equipped with hybrid dual drivers and Kirin A2 chip. It supports the upgraded NearLink technology and L2HC 4.0 codec, can achieve 2.3Mbps lossless transmission capability, and has obtained HWA Lossless and Hi-Res Wireless certification. It supports spatial audio, and the head delay is reduced by 50% compared to HUAWEI Free Buds Pro 3, and the smoothness of head movement sound is improved by 85%, presenting a more immersive listening experience.
Supports Active Noise Cancellation (ANC), based on the new third-order memory eartips and upgraded noise cancellation algorithm, combined with intelligent dynamic noise cancellation technology to achieve better noise cancellation effect. Supports AI call noise cancellation, and the algorithm is upgraded again, with three microphones and reverse bone conduction microphone pickup, it can provide clear and clean call voices in 100dB noise and 10m/s wind speed. In other aspects, it also supports NearLink finding, hearing protection, language translation, multi-device connection, smart charging and other functions.
We have previously disassembled HUAWEI products including: HUAWEI FreeClip, HUAWEI FreeBuds Pro 3, HUAWEI FreeBuds SE 2, HUAWEI FreeBuds 5, HUAWEI FreeBuds Studio, HUAWEI FreeLace Pro 2, HUAWEI FreeLace Pro, HUAWEI Sound SE, HUAWEI Sound Joy, HUAWEI WATCH GT5, HUAWEI WATCH FIT 3, HUAWEI WATCH Buds, HUAWEI WATCH GT Cyber, HUAWEI WATCH GT3, HUAWEI MateBook X Pro 2024, HUAWEI Pocket 2, HUAWEI Mate 50, etc. Let’s take a look at the detailed teardown report of HUAWEI FreeBuds Pro 4.
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$209 – HUAWEI FreeBuds Pro 4 Review
01/ HUAWEI FreeBuds Pro 4 Charging Case Teardown
Pry open the charging case shell and take out the charging bin structure. A gray bracket is set on the front of the cockpit to fix the FPC.
The wireless charging receiving coil is fixed by a bracket on the back of the charging bin.
The mainboard is fixed by screws at the bottom of the charging bin. The light blue speaker on the right side of the mainboard is used for the search function, and a sponge pad is set to seal it.
Remove the wireless charging receiving coil.
Remove the speaker structure and take out the internal speaker.
After actual measurement, the length of the built-in speaker of the charging case is about 15mm and the width is about 6mm.
Remove the screws and remove the mainboard. The circuit on one side of the charging case mainboard.
The circuit on the other side of the charging case mainboard, the wireless SoC on the left is protected by a shielding cover.
IC with silkscreen 4616.
Remove the shielding cover on the charging case mainboard.
Wireless SoC with silkscreen N283323W1120, used for wireless communication with the mobile phone to realize the search function.
A crystal oscillator that provides a clock for the wireless SoC.
A metal dome that charges the earbuds.
An IC with screen printing NZDX9F.
Southchip SC8753 is a high-efficiency direct charging chip designed for TWS charging cases.
An IC with screen printing RZR HQQ. A MOS tube with screen printing 2F. A MOS tube with screen printing P14.
Renesas DA9168 battery charging management chip, built-in dual independent LDO and reverse boost function, supports USB On-The-Go (USB-OTG) standard, has extremely low static current consumption and very compact footprint, making it very suitable for a large number of space-conscious battery-powered consumer product applications.
Another Southchip SC8753 high-efficiency direct charging chip, two chips charge two earbuds respectively.
BTB connector female socket connected to FPC.
Maxic MT5705 wireless charging receiver chip, supports Qi protocol. It uses an embedded ARM Cortex M0 processor, 2KB SRAM, 8KB OTP, and fully complies with the latest WPC Qi specification (version 1.3.3) of BPP. It can provide up to 5W output power, support output voltage 5V and current maximum 1A, and AC to DC conversion efficiency of 95%.
The high efficiency of MT5705 ensures its very low temperature rise, and the wide FOD setting range makes it easy to pass WPC’s BPP certification. MT5705 also has a complete overvoltage, overcurrent, and overtemperature protection mechanism.
TVS tube with silkscreen PA3 is used for input overvoltage protection.
Remove the gray bracket and FPC on the charging bin.
There are two sets of magnets at the bottom of the charging bin, which are used to attach and fix the earbuds and charging case lid.
The circuit on one side of the charging case FPC.
The circuit on the other side of the charging case FPC.
BTB connector for connecting the FPC to the motherboard.
LED indicator for feedback of bluetooth pairing and charging status.
Micro switch for bluetooth pairing function.
Hall element with silkscreen AQ AB, which is used to sense the change of magnetic field when the charging case is opened/closed, and then notify the charging case MCU and earbuds to pair or disconnect with the connected device.
Remove the metal cover and take out the charging case battery.
The charging case has a built-in lithium-ion polymer battery, model: HB751834ENW-11, battery parameters: 510mAh/1.97Wh/3.87V, charging limit voltage: 4.45V. Tear off the external insulation protection, the battery manufacturer is LIWINON.
02/ HUAWEI FreeBuds Pro 4 Earbuds Teardown
Disassemble the cover on the back of the earbud stem. There is also a cover inside the cavity, on which a large area of ​​LDS laser antenna is printed for wireless transmission.
Remove the cover of the bluetooth antenna. The FPC of the pressure sensor is fixed to the inside of the cover with glue.
The pressure sensor on the earbud supports pinching and sliding control, and the FPC is connected to the motherboard through the BTB connector.
The motherboard structure inside the cavity is connected to the FPC through the BTB connector.
Take out the earbud motherboard inside the cavity. The internal structure of the earbud stem cavity, the microphone pickup holes on both sides are equipped with sealing sponge pads and dustproof nets.
The circuit on one side of the earbud motherboard.
The circuit on the other side of the earbud motherboard.
The MEMS microphone of the laser engraving S811 is an external noise cancellation microphone, which is used for the noise cancellation function to pick up external environmental noise.
The metal dome connected to the bluetooth antenna.
The BTB connector female socket connected to the pressure sensor FPC.
Pressure sensing IC with screen printing MHGY AAH2. Six-axis gyroscope with screen printing T1000, used for spatial audio tracking of head movement.
BTB connector female connector for connecting the components FPC inside the front cavity.
IC with screen printing mH 4GY.
MEMS microphone of laser engraving S811, which is a call microphone and is used to pick up voice calls.
Huawei’s self-developed Kirin A2 chip with screen printing “Hi1132”, SiP system-level packaging. According to official introduction, Kirin A2 chip can achieve 8M bluetooth physical transmission rate, bringing high-resolution lossless transmission of audio signals.
IC with screen printing TQQ T81.
Disconnect the solder joints between FPC and charging contacts, and open FPC.
Disassemble the earbud head cavity. The battery is fixed inside the front cavity by a bracket. There are opposite magnets fixed inside the back cavity.
Take out the battery fixed on the front cavity, and weld the positive and negative nickel sheets of the battery to the FPC.
The information on the label of the built-in steel shell button battery of the headset is model: HB110580ENW-11. Battery rated capacity: 55.5mAh, charging limit voltage: 4.48V, nominal voltage: 3.89V.
Take out the transparent bracket inside the front cavity. The speaker structure inside the front cavity.
Take out the dynamic driver.
The bottom structure of the front cavity – the end of the FPC connects the treble driver and the noise cancellation microphone in the ear.
After actual measurement, the speaker diameter is about 11mm.
The circuit on one side of the earbud FPC, the middle IC is protected by a shielding cover.
The circuit on the other side of the earbud FPC.
The treble driver equipped with the earbud is responsible for the high-pitched part, which can reach up to 48KHz.
The third laser-engraved S811 MEMS microphone is used to pick up sound from the inside of the ear canal to further improve the noise cancellation effect.
The optical in-ear detection sensor is used to realize the automatic pause playback when the earbud is removed and the automatic resumption of playback after wearing.
The bone conduction VPU with a silk-screen QR code is used to accurately identify the bone conduction vibration sound, improve the sound pickup effect, and make the sound clearer during calls or videos.
Remove the shielding cover on the FPC. Southchip SC7289 linear charging IC.
WINSEMI WSDF2310 integrated lithium battery protection IC is a highly integrated solution for single-cell lithium-ion/lithium-polymer rechargeable battery pack protection. WSDF2310 includes advanced power MOSFET, high-precision voltage detection circuit and delay circuit, with overcharge, over-discharge, over-current, short-circuit protection functions, and very low power consumption during operation. Plus, it also supports CTL mode settings.
FPC connects to the BTB connector of the motherboard.
All components of HUAWEI FreeBuds Pro 4 true wireless noise cancellation earphones.
03/ Summary
HUAWEI FreeBuds Pro 4 continues the business style of the series, while incorporating ceramic materials and spectral silver string design to further enhance the product’s sophistication. It is also equipped with three-order memory foam eartips to better fit the ear canal and bring better noise cancellation effect.
The charging case is equipped with a LWN 510mAh lithium battery and supports both wired and wireless charging. It uses the Renesas DA9168 battery charging management chip and the Maxic MT5705 wireless charging receiver chip. It has a built-in 15x6mm square speaker and a wireless SoC for wireless communication with the phone to achieve the finding function.
The earphone has a built-in 55.5mAh 3.89V steel shell button battery and is equipped with a hybrid dual driver; it has three MEMS microphones + bone conduction VPU units for noise cancellation and voice call pickup. It uses Huawei’s self-developed Kirin A2 chip and WINSEMI WSDF2310 integrated lithium battery protection IC solution.
PS: Translated from 52audio
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