Teardown Report: HUAWEI’s FreeBuds Wireless Headphones

On June 21, Huawei brought a new entry-level TWS headset, FreeBuds, which supports double-click touch and call noise reduction, and continues the design of Huawei FreeBuds in styling, with a hanging design, lightweight and rounded, and a simple and calm design for headphones from golf clubs. 52audio network did a teardown of  the Wireless Headset  FreeBuds, to see what’s different from the previous FreeBuds.

First, HUAWEI’s FreeBuds FreeBuds wireless headphones out of the box

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

On the front of the package, the name of the product is: HUAWEI FreeBuds Free Free Premium wireless headset and Huawei’s petal logo, with a rendering of the headset in the middle, a feature icon at the bottom, compatible with Android and iOS system instructions.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The feature icon on the back has one more voice assistant to summon than the front. Below are marked with product packaging tips, battery tips, can not be discarded, recyclable, using soybean ink printing.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Packing list: Quick guide, product warranty card, extra silicone earbuds three pairs, silicone ring pair, headphones, charging cable.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Comes with a USB-A to Micro-USB charging cable.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The charging box top sits, with Huawei’s capital letters printed in dent.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Close-up at the bottom of the charging case, model: CM-H1C, input: 5.2V x 1.1A, output: 5V x 0.11A, SN: 2155030888RL95007065, CMIIT ID: 2018DP8900, Huawei Technologies Co., Ltd., Made in China.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Close-up on the front of the charging case with an indicator light under the opening and closing.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Close-up on the back of the charging case, micro-USB charging port below the hinge, a button to the left of the charging port, press to see the remaining charge of the headset charging case.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the open status of the charging case.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Charging seat compartment charging pin and microswitch, microswitch is used to detect whether the headset is in, start charging.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

52audio using ChargerLAB POWER-Z KT001 to carry out wired charging tests on HUAWEI’s Huawei FreeBuds wireless headset. The charging current is 0.641A.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Weight of charging case and headset: 52.3g.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Charge box weight: 41.3g.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Headset Weight: 11.2g.

SECOND, HUAWEI’S FREEBUDS WIRELESS HEADSET DISMANTLING

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

We detach the seat compartment connected to the snap and open the inside of the charging box.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the inside of the seat compartment with several magnets for magnetic ally positioning headphones and magnetic suction closed charging cases.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the internal component layout of the charging box.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

THE LED INDICATORS AND THE HALL ELEMENT SUBPLATE ARE INDIVIDUALLY ATTACHED TO THE PLASTIC FRAME.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the three-color LED indicating the charging status and connection status.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Silkscreen HF9152 Hall sensing IC for detecting the opening and closing status of the charging case.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A view of the overall structure inside the charging case.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Battery and motherboard front close-up, the battery is welded on the motherboard by three lines, respectively, the positive and negative poles and the temperature detection line.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Battery close-up with the back of the motherboard.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Rechargeable lithium-ion battery, model 682723, rated capacity: 410mAh, 1.558Wh, nominal voltage: 3.8V, charging limit voltage: 4.35V. Manufacturer: Chongqing Zijian Electronics Co., Ltd.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Lithium polymer battery production date: April 19, 2019.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the battery’s protection circuit, with a self-recovering fuse to limit the current, is also connected to the MOS tube in series resistance to reduce the protection current.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the microswitch, pressed to detect if the headset is in place.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the Motherboard Pogo Pin charging pin.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Tap the key close-up and press to see the amount of power remaining in the headset charging case.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Shanghai Weir WS4612 load switch, supports overcurrent protection and short-circuit protection.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Shanghai Weir WS4612 Details.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Silkscreen cKBEB boost IC.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Silkscreen ZdAYB battery charge and discharge management IC.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Shanghai Weir WS3210C overvoltage protection load switch for input protection.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Shanghai Weir WS3210C Details.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

HOLTEK Hetai HT50F32002 32-bit microcontroller.

The HOLTEK microcontroller series is a 32-bit high-performance, low-power microcontroller based on the Arm Cortex-M0 Plus processor core. The Cortex-M0 Plus is a next-generation processor core that combines nested vector interrupt controllers (NCSCs), system beat timers (SysTick Timer), and advanced debugging support. The series of microcontrollers can operate at frequencies up to 20 MHz with the help of flash accelerators for maximum performance. It provides up to 32 KB of embedded Flash memory for program/data storage, and up to 4 KB of embedded SRAM memory for system operation and application application. This series of single-chip implements has a variety of peripherals, such as hardware divider DIV, ADC, I2C, UART, SPI, GPTM, PWM, BFTM, RTC, WDT, SW-DP (Serial Line Debug Port) and more. Several power-saving modes are available to optimize the flexibility of wake-up delay and power consumption, which is a consideration for low-power applications. These features make the series of microcontrollers can be widely used in a variety of applications, such as white goods application control, power monitoring, alarm systems, consumer products, handheld devices, data recording applications, motor controllers and so on.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Let’s look at the headphone symbles section.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The microphone at the bottom of the headset has a hole in the microphone and a filter.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The noise-cancelling microphone on the edge of the headset is open.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the infrared sensor’s open window.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the headphone charging metal contacts.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the headphone relief hole used to balance the air pressure inside and outside.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The headphones are a close-up of the sound hole, covered with a metal mesh cover.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

We start disassembling the headset, first separating the top of the headset and the bottom of the headset.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The inside of the headset’s top is at a glance.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The headset positions the magnet close-up and is flanked by charging contacts.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the headset speaker unit.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The headset charges a close-up of metal shrapnel, the battery is fixed inside the plastic frame, and the circuit board is hot-melted on the plastic frame.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the infrared distance sensor to detect the user’s wear status.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the battery’s positive shrapnel.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The bottom of the headset is glued together.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The bottom structure is nested with black rubber ring, which enhances tightness and effectively waterproofs water.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The bottom structure consists of four devices: silicon wheat, black rubber ring, metal dust mesh cover, plastic bottom cover.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Laser k 94153 MEMS call silicon wheat close-up.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The headset uses a button-down lithium battery.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A comparison of the button lithium battery with the one-dollar coin.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Button lithium battery one side close-up, the battery from Zijian electronic, charging limit voltage: 4.2V.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the button lithium battery on the other side, model: LIR ZJ1254C, 3.7V, 55mAh, 0.204Wh.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The overall structure of the top of the headset is at a glance.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The FPC of the top structure is connected to the headphone board through a line socket.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

We separated the close-up of the headset board.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the overall structure on the top of the headset.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Silkscreen AD9R1 IC for distance sensor detection.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Silkscreen 7 L01 IC for magnetic induction, acceleration detection.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Silkscreen MR2 J2C IC for lithium battery protection.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Close-up of the front of the battery board.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Close-up on the back of the battery board.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

A close-up of the headset ceramic Bluetooth antenna.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Beneath the blue plastic shell is noise-cancelling silicon wheat.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

Laser k 94376MEMS silicon wheat close-up.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

St. Bonway SGM40561 high-voltage input single lithium-ion battery charging chip. Up to 30V of input pressure, effectively preventing surge damage. Supports 4.2/4.3/4.35V lithium or polymer lithium battery charging. No external anti-back-tipper diodes required, the St. Bonway SGM40561 offers a space-saving TDFN-2 x 2-8L package, thanks to its small size and wide use in headphones.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

St. Bonway SGM40561 Details.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

The headset uses bess on BeS Hengxuan BES2000IZ Bluetooth Audio SoC. The BES2000IZ is a fully integrated adaptive dual-mode Bluetooth headset solution with fully integrated, high-performance, low-power features that support the classic Bluetooth V2.1 and BLE 4.2 dual-mode. Built-in high-performance Cortex-M4F core, up to 300MHz, integrated 4MB serial flash memory within the chip for user programming, support for Constant Secret wireless stereo, support for dual microphone noise reduction and echo cancellation, support for multi-band EQ and bass enhancement, support for temperature sensors, support for USB audio playback.

Dismantling Report: HUAWEI's FreeBuds Wireless Headphones

HUAWEI’S FREEBUDS WIRELESS HEADSET DISASSEMBLED THE FAMILY PHOTO.

Isummary:

HUAWEI Huawei FreeBuds has a streamlined design with a simple, compact overall design, and an ergonomic design that makes it easy to wear comfortably and securely. The headphone structure is tight, effectively dust proof and water. The left and right headphones are equipped with double-picksilicon wheat, matching call noise reduction technology, collecting and filtering the sound of the environment, and picking up more clearly, and the internal speakers use composite diaphragm to bring good sound quality performance. The interior is equipped with a BES Hengxuan 2000 Bluetooth audio chip, with full ymme, high performance, low power consumption and so on, so that the headset as a whole has a good experience.

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