Amazfit PowerBuds Pro true wireless noise cancelling earphones teardown


Zepp Health Corporation is a cloud-based health service provider with the world’s leading smart wearable technology. In the TWS earphone market, its own brand Amazfit has successively launched Amazfit Powerbuds true wireless sports earphones, Amazfit ZenBuds sleep earbuds, and the Amazfit Powerbuds Pro noise-cancelling earphones to be disassembled this time. With the application of sports health monitoring function, it has differentiated characteristics from other products on the market.

Amazfit Powerbuds Pro is a new product launched by Zepp Health Corporation at the Amazfit 2021 global annual new product launch event held recently. The appearance is inspired by quarter notes, and the overall look is unique and fashionable. The functional configuration adopts a customized high-sealing independent acoustic module to provide rich and detailed sound quality. It supports ANC/side listening, has a variety of noise reduction modes including adaptive, and supports Sanmai AI call noise reduction.

In terms of health management function, it supports smart running recognition and automatically records exercise data, which can be viewed on the “ZEPP” APP. During exercise, the built-in heart rate monitoring module can track heart rate data in real time, remind of abnormalities, and support hearing protection and cervical spine protection. Let’s take a look at the detailed dismantling report of this product.

|1. Amazfit Powerbuds Pro true wireless earphones unboxing

The Amazfit Powerbuds Pro packaging box has a simple design, the front is embossed with a rendering of the headphones, and the text message includes the “AMAZFIT” brand LOGO and product name.

Product parameter information on the back of the box, model: earphone A2030/charging case A2031; charging case input: 5V-0.8A; waterproof and dustproof rating: earphone IP55; charging case output: 5V-0.3A; wireless connection: Bluetooth 5.0, Ble; Manufacturer: Anhui Huami Information Technology Co., Ltd.

The side display has four functional characteristics of multi-scene active noise reduction, AI call noise reduction, side listening mode, and custom sound effects.

On the other side are the four functional characteristics of exercise heart rate, intelligent running recognition, hearing health, and cervical spine protection.

The items in the box include earphones, charging cables, eartips and product manuals.

Three pairs of transparent silicone eartips are additionally distributed to meet the wearing needs of different groups of people.

USB-A to Type-C charging cable.

The overall appearance of the Amazfit Powerbuds Pro charging case adopts a vertical rounded square design with overly rounded edges and a delicate touch of the body.

There is an indicator light and the “AMAZFIT” brand LOGO on the front.

There is a function button on the back of the charging case.

The bottom of the charging case is provided with a Type-C charging interface.

Open the charging case cover and display the headset placement status.

Amazfit Powerbuds Pro Earbuds

The overall appearance of Amazfit Powerbuds Pro true wireless earphones.

The information printed on the inside of the charging case cover has model number: A2031, made in China; capacity: 510mAh/1.94Wh, input: 5V-0.8A, output: 5V-0.3A.

The other side is printed with the prohibition of discarding mark, recyclable mark and CE certification.

Amazfit Powerbuds Pro earphones adopt a handle-like in-ear design. The curve of the earphone handle is inspired by quarter notes, which is highly recognizable.

The back of the earphone handle is designed with red dots, and the other side is brown to distinguish the left and right ears. Next to it is the microphone opening.

The call microphone opening at the bottom of the earphone handle.

The pressure-sensitive button area of ​​the earphone is provided with bar-shaped bumps, which is convenient for blind operation.

The appearance of the inside of the earphones.

The optical in-ear detection sensor opens the hole.

The pressure relief hole on the top of the earphone is printed with the L/R logo next to it.

The metal tail plug for charging the earphone adopts a unique curve design and has a certain decorativeness.

Tone cavity tuning hole.

The heart rate monitoring module opens the window and is located at the sound tube of the right ear.

The sound mouth is protected by a metal dust-proof net to prevent foreign objects from entering the sound cavity.

After actual measurement, the overall weight of the Amazfit Powerbuds Pro true wireless earphones are about 55.0g.

The weight of a single earphone is about 6.8g.

Use a portable power tester to perform a wired charging test on the Huami Amazfit Powerbuds Pro true wireless earbuds, and the power is about 2.5W.

|2. Amazfit Powerbuds Pro charging case teardown

Through disassembly, we can see that this product is very distinctive in appearance design, with strong texture and recognition. Next, enter the disassembly section to see the internal structure configuration information.

Pry open the cockpit and remove the charging case shell.

Indicator light guide.

Type-C charging interface metal decorative ring.

The front structure of the charging case cockpit, the battery unit is fixed inside the bracket.

In the back structure of the cockpit, the motherboard is fixed on the bracket by screws.

Cockpit bottom structure.

Side structure of the cockpit.

Remove the battery cover.

Remove the screws, remove the battery and motherboard.

A number of FPC cable circuits are also provided on the bracket, all of which are connected to the main board through a BTB connector. On one side there is a flat cable for Hall element and Type-C power input.

On the other side is an indicator light and a metal shrapnel cable for charging the headset.

The main components in the charging case are disassembled.

In the cockpit side structure, four magnets are fixed inside to absorb the earphones and the charging case cover.

The structure on the other side of the cockpit.

The metal shaft of the charging case cover is designed with a prismatic magnet, which makes it difficult to automatically close after opening the cover through magnetic adsorption in different directions. It is stable after the cover is closed and has a very smooth opening and closing feel.

The bracket structure of the fixed component in the charging case.

The metal shrapnel for charging the earphone is welded on the bracket, and the positive and negative pole connecting cables are attached to the bracket.

The metal shrapnel is welded to the cable, and the cable is also provided with a bluetooth pairing function button.

The flat cable is connected to the motherboard through the BTB connector.

The front circuit of the Type-C power input cable is welded with overvoltage and overcurrent protection circuits.

Type-C power input cable back circuit.

The power input cable is connected to the motherboard through the BTB.

Type-C interface female seat.

A circuit protection board is arranged on the cable, and an input protection circuit is arranged on the protection board.

WillSemi ESD5641D12 Unidirectional TVS, with self-recovery fuse for input overvoltage protection.

WillSemi SD5641D12 detailed information.

Hall element FPC cable back circuit.

Hall element FPC cable front circuit.

The FPC cable is connected to the motherboard through the BTB connector.

LED indicators are also set on the cable, which is wrapped in a black sponge frame to prevent light leakage.

For the Hall element of silk-screen AL1N1, the magnetic field changes when the charging case cover is opened and closed will be sensed by the Hall element, and the charging case MCU will be notified to control the pairing or disconnection of the headset with the connected device.

The charging case uses a soft pack battery inside, with a silk-screened two-dimensional code and a no-discard sign on the front, from EVERPOWER TECHNOLOGY.

Soft pack battery model: PL631833V, from Hengtai Technology. Capacity: min510/typ525mAh, 1.94Wh, charging voltage: 3.8V/4.35V, it is a high-voltage battery.

According to 52audio, there are already true wireless headset charging cases of Redmi, Bull, Jabra, Zepp Health Corporation and other brands that use EVERPOWER TECHNOLOGY soft pack batteries. Cleer TREK active noise reduction in-ear wired headphones also use a small square battery from EVERPOWER TECHNOLOGY.

The battery is equipped with a circuit protection board.

The protection board is connected to the main board through three wires.

The integrated lithium battery protection IC of silk screen 191VBEB, the protection board has a thermistor to detect the battery temperature.

The circuit on the side of the main board is charging case.

Circuit on the other side of the motherboard.

Holtek HT50F32000 single-chip microcomputer, used for charging case control.

Silergy SY6282 low-loss load switch, used for earphone charging control.

Another SY6282 corresponds to another interface.

TI TPS62743 5.5V input, 400mA output synchronous buck regulator, used to power the MCU chip inside the charging case, with ultra-low quiescent current.

Silergy SY6918CQDC (silk screen CFABXA) is a high-efficiency two-way mobile power regulator for single-cell battery mobile power.

Silkscreen 4ALd IC.

Willsemi WPM2006 built-in Schottky PMOS tube for circuit output control.

Willsemi WPM2006 details.

TI TPS61252 synchronous boost converter is used to boost the built-in battery to charge the earphone and supports the input current limit function.

TI TPS61252 detailed information.

BTB connector female seat on the motherboard.

|3. Amazfit Powerbuds Pro earphones teardown

Enter the disassembly part of the earphone, pry open the cavity along the clamping line, and connect the front and rear cavities with the BTB through the flat cable.

The internal structure of the back cavity is provided with battery cells, and glue is applied to fix the surroundings.

The internal structure of the front cavity, the internal components are fixed in an independent plastic frame.

The sound cavity pressure relief hole on the frame allows air circulation in the cavity and improves the acoustic performance.

The sound cavity has a sound hole.

Take out the internal components of the front chamber.

The back of the bracket is fixed with an FPC cable, which has an inward noise reduction microphone and an infrared optical sensor.

The internal structure of the front cavity.

The inner side of the loudspeaker output tube is provided with a rubber gasket for sealing.

Open the frame and take out the speaker unit.

One side of the internal components of the front cavity.

The other side of the internal components of the front cavity.

The front of the dynamic driver.

The back of the dynamic driver is soldered to the small board, which is connected to the headset motherboard through the BTB.

After actual measurement, the size of the speaker unit is about 11.43mm.

Laser carving 120 ANC MEMS noise reduction microphone, used to pick up the internal noise of the ear canal.

Optical sensor module for in-ear detection function.

Pry off the back cover of the headphone handle.

The LDS laser antenna is printed on the inside of the cover for bluetooth signal transmission.

The inside of the noise reduction microphone opening is protected by a dust-proof net.

The internal structure of the earphone handle, the main board adopts the soft and hard board combination technology, and the earphone handle is provided with a bracket.

The pressure sensor module is fixed on the side of the bracket.

Plastic bracket, the right end is the acoustic structure of the microphone, which improves the sound reception performance.

Remove the motherboard and battery. The glue coated inside the back cavity is isolated from the main board in the earphone handle.

The back cavity is used to adsorb the magnet of the charging case on the cavity wall.

The solder joints on the inner side of the metal tail plug for charging the earphones are soldered on the motherboard to input power for the earphones.

A steel button battery is used inside the earphone.

The front side of the steel shell button battery, the upper nickel sheet and the middle contact are the positive and negative poles of the battery.

The model number is engraved on the back of the battery: MC1254B-S, capacity: 68mAh, from MBT.

MBT is the industry’s first steel shell battery manufacturer with a fully sealed shell and cover structure, which is very representative in terms of battery performance. According to 52audio, there are already true wireless headsets of OPPO, Nothing and other brands that use MBT button batteries.

Circuit on the motherboard side.

Circuit on the other side of the motherboard.

The PMIC of AIROHA AB2550 is used to power the headset.

Laser carving 113 ANM’s MEMS noise reduction microphone is used to pick up external environmental noise.

The accelerometer with silk-screened QR code is used for motion recognition.

Silkscreen 3460 IC.

Laser carving 113 ANMMEMS microphone, used for voice call pickup.

The pressure sensor module is used for man-machine interactive operation control.

Connect the two metal shrapnels of the bluetooth antenna.

There is a black sticker on the main control chip.

AIROHA AB1555 bluetooth audio SoC. AB155x is Airoha’s next-generation bluetooth audio solution, providing 6mA ultra-low power consumption performance, coupled with Airo’s unique MCSync TWS bluetooth stable transmission mechanism, which can provide stable connection, reduce intermittent sound skipping, low latency, and power consumption in both ears. More balanced, suitable for multiple mobile phone platforms. In terms of bluetooth audio, AB155x supports bluetooth 5.1 dual mode, and supports bluetooth low energy mode, supports A2DP, HFP, AVRCP, SPP and other functions. In terms of software, it supports voice assistants such as Google/AMA/Siri.

The AB155x chip integrates the function of active noise reduction filter, which can make noise reduction adjustments according to different environmental sounds. For the audio processing part, the audio decoder supports 24bit 192KHz high-definition sampling rate decoding, supports environmental sound detection, dual-mic voice call noise reduction and active noise reduction. AB155x has built-in CM4 processor and Tensilica HiFi mini DSP on the hardware, embedded 4MB flash memory, integrated lithium battery charge controller and power management integrated circuit, and provides a variety of flexible package sizes BGA, CSP and other options.

According to 52audio, there are already bluetooth headsets from Sony, Redmi, Beats, TOZO, OPPO, ZMI, RHA, Zepp Health Corporation, 1MOEW, realme, FIIL, Edifier, Plantronics, earsopen and other brands that have adopted AIROHA. plan.

The memory chip of the silk screen 6AJI.

The crystal oscillator that provides the clock for the bluetooth chip.

The second crystal oscillator.

CHIPSEA CSU18M65 pressure sensing IC is a bridge sensor conditioning chip with integrated 24-bit ADC and dual-channel input. Support I2C communication interface, built-in 8-bit RISC core, MTP memory, support user programming, can be used for pressure, gas and other sensor conditioning.

Silkscreen ALT KAD IC.

The call microphone pickup hole on the motherboard is protected by a dust-proof net.

Compared with the left earphone, the internal structure of the right earphone cavity has an extra FPC cable connection with a heart rate monitoring sensor module.

Remove the sensor module cover.

The heart rate monitoring sensor module is used for running recognition function to detect the heart rate status. GOODiX GH300 low-power heart rate measurement chip is a heart rate sensor module that integrates 2 LEDs, an optical receiver (PD) and an analog front end. It has ultra-small size and ultra-low power consumption. It is suitable for smart headphones, Products that have strict requirements on size and power consumption, such as smart rings.

For smart headset applications, the GH300 integrates a wearing detection function, and supports access to an external light receiver (PD) and LED module to achieve higher precision wearing detection requirements.

The internal components of the right earphone.

Except for the difference in circuit layout, the left and right earphone motherboard units have the same configuration.

Comparison of the circuit on the other side of the motherboard.

All components of Amazfit Powerbuds Pro true wireless earphones.

|4. Summary

Amazfit Powerbuds Pro wireless noise-cancelling headphones are designed with a vertical rounded square design with rounded corners. The edges are overly rounded and the body feels delicate and comfortable. The handle-shaped in-ear headphones are inspired by the quarter note, with a unique and stylish look and feel, and are highly recognizable. The earphones are equipped with various sizes of silicone earplugs to provide a comfortable wearing effect.

In terms of internal structure design, the overall structure is complex and orderly, and the workmanship is very delicate. The components are fixed by brackets, and the components are connected by BTB connectors, which improves the convenience of assembly. The charging case uses Type-C interface input power, and Willsemi ESD5641D12 TVS is responsible for the power interface protection. Built-in EVERPOWER 3.8V high-voltage battery with a capacity of 510mAh, equipped with an integrated lithium battery protection IC.

Holtek HT50F32000 microcontroller is used on the charging case main board, which is responsible for the control of the whole machine. Two SILERGY SY6282 low-loss load switches are used for headset charging control, and one SILERGY SY6918CQDC is used for internal battery charging. TI TPS62743 synchronous buck regulator, powers the MCU chip inside the charging case, and TPS61252 synchronous boost converter, used to boost the built-in battery to charge the earphones, etc.

Amazfit Powerbuds Pro earphones have a regular internal look and feel. Custom acoustic modules are used in the front cavity, an independent sound cavity structure is set, and an 11.43mm dynamic driver is built-in. The flat cable is fixed on the outer wall of the sound cavity, and a back-feed noise reduction microphone and an optical in-ear detection unit are provided. There is also a GOODiX GH300 low-power heart rate measurement sensor unit with a cable extending to the output tube in the right earphone. A MBT 68mAh high-capacity steel shell button battery is set in the back cavity, and the positive and negative poles are directly connected to the main board.

On the motherboard, AIROHA AB1555 bluetooth audio SoC is adopted, which integrates an active noise reduction filter, supports environmental sound detection and active noise reduction, and is AIROHA’s new generation flagship bluetooth audio solution. The PMIC of AIROHA AB2550 is used to power the headset. CHIPSEA CSU18M65 pressure sensing IC, used for pressure sensing button control interaction. There are also two MEMS microphones on the motherboard, paired with the microphone in the front cavity for noise reduction and call functions.

Source: 52audio


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