Baseus Bowie M2 Teardown: Bluetooth 5.2+Class 10 Custom Adjustment ANC


Baseus is an emerging consumer electronics brand that has launched a number of hot-selling products in the fields of charging, audio, car products, smart home, and smart home appliances, and is recognized by many fans around the world. Baseus started its full-scale efforts in the audio field in 2017, and has continuously launched dozens of products such as TWS earbuds, neckband headphones and over-ear headphones. What 52audio will teardown this time is its recently released true wireless noise cancelling headphones.

Baseus Bowie M2 continues the family-style simple and fashionable design style in appearance, and introduces gradient layered color to break the boundaries. In terms of functional configuration, it adopts a 10mm composite diaphragm unit, is equipped with Bluetooth 5.2 version, supports three noise cancelling modes, 4-mic ENC call noise cancelling, active noise cancelling has a 10-level custom adjustment level; it also supports dual-device intelligent connection, open It has functions such as connecting the cover, listening when you put it on, and fast charging, and has a comprehensive battery life of 30 hours.

The Baseus TWS earbuds disassembled by 52audio include: Baseus Bowie E2, Baseus AirNora, Baseus Encok W01, Baseus Encok W04 Pro, Baseus Encok W07, Baseus Encok W09 and Baseus Encok WM01 true wireless earbuds. Let’s take a look at the detailed disassembly report of this product.

01/ Baseus Bowie M2 true wireless earbuds unboxing

The packaging box is still based on Baseus’s minimalist design, and the front shows the design of earbuds, the product name “Baseus Bowie M2 true wireless earphones” and the Baseus brand LOGO.

The back of the box introduces some parameter information of the product through various texts, model: Baseus Storm Lite, battery capacity: 40mAh/0.148Wh (earbuds), 400mAh/1.48Wh (charging case), rated input of earphones: DC5V-80mA, charging Case rated input: DC5V-600mA, frequency response range: 20Hz-20kHz, charging interface: Type-C. Below are company information and various certification marks.

The pictures and texts on the side of the box show three functional features of the product: Active noise cancelling, Baseus rapid charge and Baseus dual channel low latency.

The other side is Bluetooth 5.2, 30 battery life and ENC call noise cancelling.

The packaging and interior items include earphones, eartips, charging cables and product manuals.

The white charging cable uses a USB-A to Type-C interface.

There are two different sizes of silicone eartips, and one pair is pre-installed on the earphones, with a total of three specifications to meet the individual needs of users.

Baseus Bowie M2 charging case appearance, pure white body, rounded square design. The front opening is designed with a chamfered corner for easy opening, and there is an indicator light below it to feedback the remaining power information of the charging case.

There is a bluetooth pairing button on the back of the charging case, as well as the Baseus brand LOGO.

The Type-C charging interface is located at the bottom of the charging case and is protected by a silver metal ring.

Open the charging case cover, and display the placement status of earphones.

The parameter information of the product is silk-screened on the inside of the box cover. Earphone battery capacity: 40mAh/0.148Wh, input: 5V-80mA; charging case battery capacity: 400mAh/1.48Wh, input: 5V-600mA; FCC ID: 2AY37-LITE, made in China.

The other side is printed with the CE certification mark, which prohibits discarding and can be recycled.

The L/R logo is engraved on the cockpit, which is placed in the left and right order, and can be worn without adjustment after taking it out.

Baseus Bowie M2

Take out the earphones from the charging case.

The metal contacts for charging the earphone are located at the bottom of the cockpit of the earphone stem.

Baseus Bowie M2

Baseus Bowie M2 true wireless noise cancelling earphone overall appearance.

Baseus Bowie M2 earphones use a handle-shaped in-ear design, which is consistent with the texture of the charging case.

The outer appearance of the earphone. The earphone handle adopts a more square design, and the overall look and feel is more three-dimensional.

The outer side of the earphone handle is provided with an opening for a voice pickup microphone.

The bottom of the earphone handle is set to the metal tail plug for earphone charging.

Inside appearance of earphone.

The L/R logo is printed on the inside of the earphone handle, which is convenient for users to distinguish quickly.

Two oval pressure relief holes ensure air circulation in the cavity, reduce the pressure difference between inside and outside, and improve wearing comfort.

The earphone eartip comes with a layer of protective holes to isolate larger foreign objects.

The sound mouth is also covered with a layer of fine dustproof net to prevent foreign objects from entering the sound cavity. There is an inward noise cancelling microphone inside, which works with the call pickup microphone to improve the clarity of voice calls.

Inward-facing microphone pickup opening on the sound tube.

After actual measurement, the overall weight of Baseus Bowie M2 is about 44.5g.

A single earphone weighs only 4.2g, making it light and comfortable to wear.

Wired charging test for Baseus Bowie M2 earphones using a portable power tester, the charging power is about 1.92W.

02/ Baseus Bowie M2 charging case teardown

Through unpacking, we have a detailed understanding of the design of this product. Let’s go to the dismantling part to see the internal structure design and configuration information.

Pry open the charging case and take out the charging case cockpit.

The indicator light guide column and the anti-leakage sponge on the charging case shell.

One side of the cockpit structure of the charging case. The indicator light and the Hall element cable are connected to the main board through the connector, and the battery is located in the middle of the structure, which plays a good protective role.

An isolation plate is arranged on the other side of the cockpit, and the bluetooth pairing function button is fixed on the isolation plate.

The motherboard unit is fixed by screws at the bottom of the cockpit.

Remove the screws and remove the main components from the cockpit.

The bottom structure of the cockpit is provided with 4 screws for fixing the charging case cover and earphone.

The main circuit inside the charging case.

The charging case has built-in lithium battery model YJ851730K-2C, rated voltage: 3.7V, rated capacity: 400mAh.

The battery is equipped with a circuit protection board, which is equipped with DW01 lithium battery protection IC, 8205A MOS tube and thermistor.

Circuit on the motherboard side.

Circuit on the other side of the motherboard.

Indicator light and Hall element wiring circuit.

Two LED indicators with different colors are used to feedback the charging case power information and the bluetooth pairing status.

The hall element of the silk-screen AR1x1 is used to sense the magnetic field change when the charging case is turned on/off, and then notify the charging case MCU and earphones to pair or disconnect from the connected device.

Bluetooth pairing function button.

Type-C charging interface female socket with orange tongue.

TPS SY8801 TWS earphone charging case SOC, specially designed for TWS earphone charging case. On the basis of the design to ensure safety and high reliability (supports 28V input withstand voltage, built-in full-function charging and discharging overvoltage, overcurrent, overtemperature, short circuit protection, etc.), it also integrates I2C communication function and internal communication isolation function . Through the I2C interface, the MCU of the system can read and configure the internal functions of the power supply and the parameters of battery charge and discharge management, and easily realize such as NTC protection, segment adjustment of battery current, TWS earbuds warehouse entry, warehouse exit detection, and automatic power output. and other functions.

The integrated internal communication isolation module of TPS SY8801 greatly optimizes the functional design of the smart TWS charging compartment. No complicated peripheral circuits are required, and the MCU can be realized by connecting and controlling the SY8801. It can not only realize the function of charging the earphone, but also transmit data through the POGO PIN of the power supply connected to the earphone, and realize functions including uploading the power of the charging compartment, clearing and pairing the earphone in the charging compartment, restoring the factory settings, and upgrading the earphone software.

According to 52audio, the TPS power management chip has been adopted by Baseus, Xiaomi, OPPO, OnePlus, realme, Transsion, MEIZU, 1MORE, Baidu, Edifier, JBL, HARMAN, Lenovo and other brands.

3R3 inductor, with power management chip boost to charge earphone.

ZIF connector for connecting Hall element cable, from Yaqi Technology Co., Ltd, model OK-F501-06325.

CHIPSEA CSU32P20 8-bit RISC OTP MCU with 12-bit ADC, built-in 2K×16-bit OTP program memory, 104-byte SRAM, used for charging case function control.

The charging case is a metal shrapnel for charging earphones.

03/ Baseus Bowie M2 earbuds teardown

Enter the earphones disassembly section. Pry open the cavity along the earphone head parting line.

The internal structure of the sound cavity includes speakers, microphones, and in-ear detection patches.

A battery unit is arranged inside the rear cavity.

The bottom of the rear cavity is sealed and isolated by a large amount of glue, and the components in the front cavity and the rear cavity are connected to the main board in the earphone handle through cables and wires.

A magnet for attaching to the charging case.

Take out the speaker, and there is an inward-facing microphone unit below.

Remove the front chamber internal components.

Pry open the back cover of the earphone handle, the internal structure of the cavity.

The inner side of the cover is provided with a touch detection patch and a bluetooth antenna.

The internal cable of the front cavity is connected with the main board through the BTB connector, and a sponge pad is set above the connector to fill it, which plays a fixed role.

The positive and negative wires of the battery are welded on the motherboard.

The main circuit inside the front cavity.

Male BTB connector for connecting to the motherboard, model OK-114GM008-35, from Yaqi Technology Co., Ltd.

Capacitive in-ear detection patch, used to automatically pause when the earphone is removed, and automatically resume playback when the earphone is worn.

The MEMS microphone of the laser carving R130 A510, from RAYKING, is used to pick up the sound of the noise cancelling function of the call.

On the back of the speaker, there is a cable connection attached.

Front of the speaker.

After actual measurement, the speaker size is about 10mm.

The earphone uses a steel shell button battery, model: LIR1040, also from YANJOO.

Circuit on the motherboard side.

Circuit on the other side of the motherboard.

Yaqi BTB connector female socket for connecting speaker cable on the motherboard, model OK-114GF008-35.

Metal dome used to connect the touch detection patch.

Silkscreen 1wC3 lithium battery protection IC.

Silkscreen BE’s IC.

Metal shrapnel for charging earphones.

Laser engraving R120 A51D MEMS microphone, used for voice call pickup.

Bluetrum BT8922H bluetooth audio SoC with built-in 32-bit high-performance CPU and DSP instructions. Equipped with high-performance stereo DAC and dual-channel high-performance ADC, it supports Hybrid ANC and sound plus DNN call algorithm. Built-in 16Mbit Flash, support customer APP and OTA upgrade. Support Bluetooth 5.2 and BLE specifications, support TWS communication, TWS master-slave switch. Supports AAC, mSBC audio decoding and low-power touch buttons and in-ear detection. It also integrates step-down and lithium battery charging functions, helping to achieve a streamlined earphone design.

According to 52audio, the products of Baseus, Monster, HYMALAYA, NOME, Transsion, LeTV, AMOi, NOME, Lenovo, Philips, UGREEN, 360, Audio-Technica, Fantini, Defunc, Coocaa and other brands have adopted the Bluetrum solution.

Bluetrum BT8922H details.

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

TianYiHeXin HX9023 touch detection IC integrates capacitive sensing AFE for specific absorption rate (SAR) applications. Support 1.8V power input, output data through I2C bus. The HX9023 supports up to three sensor inputs with offset compensation capacitors up to 400pF. HX9023 has high sensitivity and can detect human body approaching. Suitable for earphones and smart wearable products.

TianYiHeXin HX9023 details.

A metal tail plug for connecting the charging case and earphone, for charging earphone.

All components of Baseus Bowie M2 true wireless noise cancelling earphones.

04/ Summary

The Baseus Bowie M2 charging case has a rounded square design with a pure white clean body. earphone is a handle-shaped in-ear design, weighing only 4.2g, with three different sizes of soft silicone eartips to provide a comfortable and stable wearing experience.

In terms of internal structure and configuration, the charging case has a built-in YANJOO 400mAh battery and uses a Type-C interface for input power. The lithium battery is charged by the TPS SY8801 TWS earphone charging bin SOC, and has built-in full-function charging and discharging overvoltage, overcurrent, overtemperature, short circuit protection and other functions. Integrated I2C communication function and internal communication isolation function. CHIPSEA CSU32P20 MCU is also used for charging case function control.

The earphone is equipped with a YANJOO 40mAh steel shell button battery, a 10mm dynamic driver, two MEMS microphones for a single earphone and a capacitive in-ear detection unit. On the motherboard, BLUETRUM BT8922H bluetooth audio SoC is used, which supports Bluetooth 5.2 and AAC audio decoding. Integrated step-down and lithium battery charging functions for a streamlined earphone design. TianYiHeXin HX9023W touch detection IC is also used.

Source: 52audio

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