HUAWEI FreeBuds Pro 2+ adds heart rate and body temperature detection functions on the basis of full-link high-resolution sound quality and smart dynamic noise cancellation 2.0. Through infrared and green light dual-band heart rate monitoring sensors, combined with HUAWEI TruSeen heart rate fusion algorithm, it supports high-precision real-time heart rate measurement, continuous heart rate monitoring, and abnormal heart rate reminder functions.
Through the 3D three-dimensional temperature measurement framework, the temperature of the ear canal, ear surface and ear rod are respectively detected, and the intelligent temperature measurement software algorithm is integrated to provide users with body temperature data. Cooperate with Huawei Sports Health App to help users keep abreast of their physical status and manage their health.
We have teardown Huawei products before, including: Huawei FreeBuds Pro 2, Huawei FreeBuds Pro, Huawei FreeBuds 4E, Huawei FreeBuds 4, HUAWEI WATCH GT Cyber, HUAWEI WATCH GT3, Huawei Band 7, Huawei Sound Joy, Huawei AI Speaker 2e and HUAWEI Tag. Let’s take a look at the detailed teardown report of this product.
01/ Charging case teardown
Take off the golden nameplate, and take out the charging cockpit structure along the buckle of the charging case.
The inner structure of the charging case shell, and the optical structure of the indicator light is set at the bottom. There is a shielding sticker on the wireless charging position on the side.
The structure on one side of the charging cockpit is protected by a plastic cover on the outer layer, and the indicator light and the Hall element cable are pasted.
There is a wireless charging receiving coil attached to the other side of the charging cockpit.
The bottom of the charging cockpit is the motherboard unit.
Pop open the connectors, remove the screws, and remove the motherboard.
The circuits and components on one side of the motherboard are coated with glue for protection.
The circuit on the other side of the motherboard is only equipped with a connector for charging the earbud.
The wiring circuit of the bluetooth pairing button.
Metal dome connector for charging earbuds.
Silk screen AEKR’s IC.
Silkscreen CB IC.
Connect the BTB connector of the battery cable.
LED indicator for feedback charging status.
Nations N32G4FRHE MCU microcontroller. The N32G4FR series uses a 32-bit ARM Cortex-M4 core with a maximum operating frequency of 144MHz. Support floating-point operations and DSP instructions, built-in cryptographic algorithm hardware acceleration engine, integrated up to 512KB encrypted Flash memory, 144KB SRAM, which can be used to safely store fingerprint information. Support mainstream semiconductor fingerprint and optical fingerprint sensors. Supports up to 18 channels of capacitive touch keys, and integrates rich U(S)ART, I2C, SPI, QSPI, USB, ADC, DAC, SDIO and other general peripheral interfaces.
The crystal oscillator of the laser carving T240 provides the clock for the MCU.
The BTB connector that connects the indicator light and the Hall element cable.
Silk screen 224 62149 IC.
Silkscreen A26 AD IC.
Screen printing N6S Z IC.
Silk screen RZR DJH’s IC.
Silk screen P14 MOS tube.
Renesas DA9168 battery charge management chip, built-in dual independent LDO and reverse boost function. Supporting the USB On-The-Go (USB-OTG) standard, it features extremely low quiescent current consumption and a very compact footprint, making it ideal for space-conscious battery-powered consumer applications.
Silkscreen 7R6 boost IC.
Screen printing JMK’s IC.
Renesas IDT P9221 wireless charging receiver chip, highly integrated, Qi-compliant, suitable for 15W applications. The P9221 uses magnetic induction charging technology, where the receiver converts the AC power signal from the resonant tank into a regulated 9V or 12V DC output voltage. An integrated low RDS(ON) synchronous rectifier and ultra-low dropout regulator provide high efficiency, making it ideal for battery-powered applications.
Remove the battery frame structure on the charging cockpit.
The bottom structure of the charging cockpit is equipped with a Hall element to detect the state of the switch cover, and multiple magnets are used to absorb earbuds and charging case cover.
Hall element and indicator light wiring circuit. The indicator lights are sealed by black plastic parts to prevent light leakage.
The BTB connector that connects the cable to the motherboard.
Circuit after removing the sealing cover.
The silk-screen mH 2kD Hall element is used to sense the magnetic field change when the charging case is turned on/off, and then notify the charging case MCU and earbuds to pair or disconnect the connected device. The yellow part is the LED indicator, which is used to feedback the bluetooth pairing status.
Take out the battery inside the cavity.
The charging case has a built-in lithium-ion polymer battery, model: HB781937ECW-A, rated capacity: 580mAh, rated voltage: 3.82V, charging limit voltage: 4.4V, made in China.
Tear off the outer label, and the silk screen information on the inner battery comes from LISHEN.
The circuit on one side of the battery protection board is equipped with a lithium battery protection IC and a thermistor, which are protected by black hard glue.
02/ HUAWEI FreeBuds Pro 2+ earbuds teardown
Enter the earbuds dismantling section and open the right earbud head.
The internal structure of the front cavity of the earbud is provided with transparent plastic parts to fix the components on the wall of the cavity.
Inside the rear cavity of the earbud is the battery unit.
Remove the transparent cover and the heart rate monitor sensor.
The front of the heart rate monitoring sensor.
Open the heart rate monitor sensor optical Fresnel lens cover.
Infrared and green light dual-band heart rate monitoring sensors, combined with HUAWEI TruSeen heart rate fusion algorithm, provide high-precision heart rate detection and continuous heart rate monitoring.
Take out the dynamic speaker inside the front cavity of the earbud.
Micro-panel tweeter and noise cancellation microphone structure inside the cavity.
The front of the four-magnet dynamic driver, the low frequency can be extended to 14Hz.
On the back of the four-magnet dynamic driver, the model number “559G” is silk-screened.
After actual measurement, the size of the four-magnet dynamic driver is about 11mm.
Take out the cable inside the front cavity of the earbud.
The MEMS microphone of Leidiao S811 is used for ANC function to pick up noise from inside the ear canal.
On the front of the micro-plate tweeter, the treble can reach up to 48kHz.
The optical in-ear detection sensor is used to automatically pause the music playback when the earbud is taken off, and automatically resume the playback function after wearing it.
Take out the steel shell button battery inside the rear cavity of the earbud.
The battery is engraved with a QR code and model number “3266AXM718XF17D5”.
Remove the back cover of the headset stem.
The motherboard structure inside the cavity, the main IC is protected by a metal cover.
Take out the main board and the internal structure of the cavity. Connect the cables of the components in the earbud head to the motherboard through the BTB connector.
The acoustic structure of the microphone is equipped with a dust-proof net and a sealing rubber ring to improve the radio performance.
Take out the inner cable of the headset stem.
The cable board is protected by a shield.
The motherboard circuit after removing the shield cover.
GOODi GH3020 health monitoring IC, integrated multi-channel PPG. It has heart rate (HR), heart rate variability (HRV) and blood oxygen saturation (SpO2) monitoring functions, as well as ultra-low power consumption and ultra-high precision features. Suitable for high-end smart watches, smart bracelets, professional sports equipment, medical equipment, etc.
Silkscreen MU6 L3D IC.
Screen printing CW6305B low-power linear charging chip.
Screen printing JM MRAY’s IC.
Pressure sensitive sensor on the side of the cavity. Supports pinch and slide controls. The NDT pressure-sensitive solution is adopted.
The BTB connector for the pressure-sensing sensor to connect to the motherboard.
Take off the shield cover on the main board, the circuit on one side of the main board.
The circuit on the other side of the motherboard.
Laser carving G325 2B15 MEMS microphone, used for noise cancellation function to pick up external environmental noise, from Goermicro.
The Goermicro MEMS microphone on the other side of the motherboard. Both microphones are of the same model.
The metal dome that connects to the bluetooth antenna.
Connect the BTB connector of the pressure sensing sensor.
ST LSM6DSV16BX 6-axis IMU, bone conduction two-in-one chip. The 6-axis IMU is used for the spatial audio function, and the bone conduction is used for the noise cancellation of the uplink call. At the same time, the software can support head tracking and VAD algorithm.
AWINIC AW86862 pressure sensing IC, the size is 1.41mm×1.41mm, which is 67% smaller than the previous generation. It has the functions of pressure sensing signal acquisition, amplification and processing. Integrates 1 I²C communication module, 1 system control module, 1 power management module and 1 AFE module (including 2 analog input differential channels and multiplexers, 2-stage PGA, 11-bit offset calibration DAC, 14 bit ADC and intelligent pressing logic processing module).
Connect the BTB connector of the flex cable.
Screen printing AQ2F IC.
The crystal oscillator of the laser carving YL240 provides the clock for the bluetooth chip.
BES BES2700YP bluetooth audio SoC has the characteristics of ultra-low power consumption and high integration. Using 12nm process technology, it integrates dual-mode Bluetooth 5.3. Support BT&BLE, the main processor has built-in Arm Cortex-M55 CPU and Tensilica HiFi 4 DSP, which greatly improves the computing performance of the chip. The sensor hub subsystem has built-in STAR-MC1 MCU and BES self-developed neural network processor BECO NPU. Enables rich application processing capabilities while significantly reducing power consumption.
The power inductor around the bluetooth chip supplies power to its internal circuit.
Silk screen TL IC.
Remove the left headset stem cover.
Take out the motherboard unit, the internal structure of the cavity is the same design as the right earbud.
Comparing the motherboard circuits of the two earbuds, the main configuration is the same, and there is an extra temperature sensor on the motherboard of the left earbud.
The temperature sensor is used to detect the temperature of the headset stem.
Comparison of the circuits on the other side of the motherboard of the two earbuds.
Disassemble the earbud head cavity.
Compared with the right earbud, the motherboard circuit on the back of the battery lacks a health monitoring IC.
The internal structure of the front cavity of the earbud. Compared with the left earbud, the heart rate monitoring sensor is replaced by a body temperature detection sensor.
Take out the dynamic driver and body temperature detection sensor.
Temperature detection sensor.
Micro-panel unit and microphone inside the cavity.
Take out the wiring inside the cavity.
The temperature sensor structure is protected by a metal cover.
The temperature sensor inside the ear canal, together with the temperature sensor inside the ear meter and ear rod, can obtain user body temperature data.
All components of HUAWEI FreeBuds Pro 2+ TWS noise cancellation earbuds.
03/ Summary
The appearance of HUAWEI FreeBuds Pro 2+ continues the design of the previous generation, with a “pebble” charging case and square headset stem in-ear earbuds. The difference is that the edges of the nameplate, LOGO, and headset stem are treated with gold-plated technology, which further improves the overall texture.
In terms of internal structure and configuration, the charging case structure is similar to the previous generation, but the power solution is different. The built-in battery capacity is 580mAh, and the batteries are from LISHEN. Both wired and wireless charging methods use Renesas products, including Renesas DA9168 battery charging management chip and Renesas IDT P9221 wireless charging receiving chip. The MCU still uses the Nations N32G4FRHE chip for the overall control of the charging case.
Inside the earbuds, heart rate and body temperature detection sensors are added on the basis of the previous generation. Including the infrared and green light dual-band heart rate monitoring sensor inside the right earbud and the three temperature sensors inside the left earbud. Equipped with GOODiX GH3020 health monitoring IC, it provides ultra-low power consumption and ultra-high-precision heart rate detection function.
In other respects, earbuds is equipped with 11mm four-magnet dynamic + micro-panel tweeter unit, 2 external ear + 1 internal MEMS microphone. The main control chip is BES BES2700YP bluetooth audio SoC. It also uses AWINIC AW86862 pressure sensing IC, and ST LSM6DSV16BX 6-axis IMU and bone conduction two-in-one chip for spatial audio and call noise cancellation functions.
Source: 52audio
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