Compared with the previous generation, Baseus Bowie M2s adopts a new open cockpit design in appearance. In terms of functional configuration, upgrade Bluetooth 5.3 and noise cancellation chips. Combined with acoustic design collaborative optimization, it achieves a maximum noise cancellation bandwidth of 4000Hz and a noise cancellation depth of 48dB, and provides three noise cancellation modes and 10 levels of custom adjustment.
In terms of calls, it supports dual-mic AI noise cancellation algorithm, intelligently separates human voice and background sound, reduces wind noise, and provides high-definition call effects.
Baseus Bowie M2s uses a high-dynamic bio-diaphragm speaker, ultra-wideband and high-resolution, and highly reproduced sound. Added BISA spatial sound effect, supporting two modes of music and movie. Provides more immersive audio effects through stereo enhancement technology. The battery life has also been improved, with a single battery life reaching 7 hours and a comprehensive battery life of 30 hours.
We have also teardown Baseus products including: Baseus Bowie M2, Baseus Bowie E9, Baseus Bowie E2, Baseus AirNora, Baseus Encok W01, Baseus W04 Pro, Baseus W07, Baseus W09 and Baseus WM01. Let’s take a look at the detailed teardown report of this product.
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$42 – Baseus Bowie M2s review
01/ Baseus Bowie M2s charging case teardown
Disassemble the charging case and take out the cockpit of the charging case.
The bottom structure of the charging cockpit, the main board is fixed by screws.
The battery unit is fixed on one side of the charging cockpit, which is cushioned and protected by a sponge pad.
Remove the components on the charging cockpit, including the motherboard, battery and FPC.
The bottom structure of the charging cockpit, blue glue fixes 6 magnets for fixing earbuds and charging case cover.
The circuit on the side of the motherboard of the charging case.
The circuit on the other side of the charging case motherboard.
LED indicator for feedback charging case remaining battery.
Bluetooth pairing button.
ZIF connector for FPC.
Metal connector for charging earbuds.
MCU microcontroller for charging case control.
TPS SY8801 bluetooth headset smart charging case solution, integrated charging module and discharging module, charging current and discharging cut-off current can be adjusted externally.
SY8801 uses the output power and ground to realize the communication between charging case and earbuds. The chip integrates standard I2C interface and interrupt signal to facilitate the communication between the chip and MCU. At the same time, the chip also provides load detection and load insertion identification. SY8801 is very suitable for the design of charging case, which greatly simplifies the peripheral circuit and components, and provides an easy-to-use solution for the application of charging case.
The 3.3μH boost inductor works with the power management chip to boost the battery to charge the earbuds.
FPC circuit.
The Hall element of the AR3C1 silk screen 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 with the connected device.
Lithium battery model: WEL 602035, nominal voltage: 3.7V, rated capacity: 400mAh 1.48Wh, production date: March 8, 2023.
The battery is equipped with a protection board circuit board, equipped with a lithium battery protection IC and MOS tube, and a thermistor for detecting the battery temperature.
Screen printing DW01AT lithium battery protection IC, used for battery overcharge, overdischarge, overcurrent and other protection.
The silk screen 8205A MOS tube works with the lithium battery protection IC.
02/ Baseus Bowie M2s earbuds teardown
Enter the teardown part of the earbuds, first remove the back cover of the headset stem.
The inside of the cover is provided with a bluetooth antenna and a touch detection patch.
The acoustic structure of the microphone at the end of the headset stem improves the sealing and brings better radio performance.
The motherboard structure inside the cavity, and the FPC inside the earbud head is connected to the motherboard through the BTB connector.
Open the earbud head and disconnect the battery wire.
The inside of the earbud uses a steel shell button battery, which is wrapped with high-temperature insulating tape.
Steel shell button battery model: M1040S2, nominal voltage: 3.85V, energy: 0.135Wh, from MIC-POWER. The negative electrode of the battery is engraved with a QR code for product traceability.
Remove the connector, take out the motherboard and the metal connector that charges the earbuds.
The internal structure of the front cavity, the FPC is connected to the speaker and the in-ear detection sensor.
Take out the speaker, and connect the feedback microphone to the end of the FPC.
The speaker is connected to the FPC, with a tuning hole on the edge and protected by a wire mesh.
After actual measurement, the speaker size is 10mm.
The MEMS feedback microphone of the laser carving R313 A51D is used for the noise cancellation function to pick up the environmental noise, from RAYKING.
The capacitive in-ear detection sensor is used to automatically pause music playback when the earbuds are taken off, and automatically resume playback after wearing them.
The BTB connector that connects the FPC to the motherboard.
The circuit on the side of the earbud motherboard.
The circuit on the other side of the earbud motherboard.
The motherboard is equipped with a RAYKING MEMS call microphone of Leidiao R313 A51D, which is used for voice calls to pick up human voice.
Bluetrum BT8952F bluetooth audio SoC belongs to the third-generation BT895x series, based on 22nm advanced low-power technology. Support the latest Bluetooth 5.3 LE Audio protocol and LC3 codec.
Bluetrum BT8952F has a built-in 32-bit high-performance RISC-V processor core and HIFI 4 DSP. The maximum speed of the processor is 125MHz, and the maximum speed of HIFI 4 is 270Mhz. Built-in 16Mbits flash memory, 892KB RAM, flexible GPIO pins with programmable pull-up and pull-down resistors. Support GPIO wake-up or interrupt.
Bluetrum BT8952F has built-in 24bit dual-channel DAC and 24bit mono-channel ADC, supports flexible audio equalizer adjustment and 2-way MIC amplifier input. BT8952F has a built-in dual-mic AI call noise cancellation algorithm, which can realize dual-mic beamforming call noise cancellation or 1+1 microphone call noise cancellation. Support feedforward, feedback and hybrid ANC functions. Integrate touch, PMU and other modules.
The precision winding inductor around the bluetooth chip supplies power to its internal circuit.
WINSEMI WSDF13E2N2H lithium battery protection IC, built-in advanced power MOSFET, high-precision voltage detection circuit and delay circuit. It has overcharge, overdischarge, overcurrent, short circuit and other protection functions required by all batteries, and the power consumption is very low during operation. Comes in a very small DFN4L-1×1 package, ideal for wearable devices.
Connect to the BTB connector of the FPC.
Connect the metal connector of the touch detection patch.
Silk screen 135 A38E touch detection IC for touch control function.
The 24.0MHz crystal oscillator provides the clock for the bluetooth chip.
Two metal components that connect to the bluetooth antenna.
The connector at the end of the headset stem is the metal component that charges the earbuds. In the middle is the sound pickup hole for the call microphone, and the double-sided foam glue is sealed with the acoustic structure on the cover.
All components of Baseus Bowie M2s true wireless noise cancellation earbuds.
03/ Summary
In terms of appearance, the charging case adopts a new open cockpit design, which is fixed by multiple magnets, making it stable and not easy to fall off. The fuselage is spliced with two processes of baking paint + frosting, which is more textured. The handle-shaped in-ear earbuds are similar in appearance to the previous generation. The square headset stem is matched with the fluorescent scatter design on the back panel – very recognizable.
In terms of internal configuration, the charging case has built-in 400mAh lithium battery, and is equipped with a circuit protection board responsible for overcharging, overdischarging, and overcurrent protection. The main board adopts the Type-C interface input power supply, and the TPS SY8801 bluetooth headset smart charging box solution is responsible for charge and discharge management. The charging current and discharge cut-off current can be adjusted externally, and integrates standard I2C interface and interrupt signal – convenient to communicate with MCU communication.
The earbud is equipped with a 10mm dynamic driver, and a single earbud has two RAYKING MEMS microphones built in for voice calls and noise cancellation. Capacitive touch detection and in-ear detection sensors are used to realize smart control. Built-in MIC-POWER 3.85V 0.135Wh steel shell button battery, equipped with WINSEMI WSDF13E2N2H lithium battery protection IC. The main control chip is Bluetrum BT8952F bluetooth audio SoC, which supports the latest Bluetooth 5.3 LE Audio protocol. Built-in dual-mic AI call noise cancellation algorithm, supports feedforward, feedback and hybrid active noise cancellation functions.
Source: 52audio
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