52audio recently got the new “Bowie E2 True Wireless Earphones” from consumer electronics brand Baseus. The earphones adopt the appearance design of mini candy beans, and the weight of a single earphone is about 4.4g, which is suitable for young people who like high level of appearance earbuds.
The earphones have built-in high-elastic PU composite diaphragm dynamic, which can bring users a more balanced hearing. Earphone adopts Bluetooth 5.2 main control chip and Baseus dual-channel low-latency technology, which compresses the latency to 60ms to improve the user’s film and television experience. At the same time earphones also support the function of single ear positioning within the range. In terms of battery life, the earbuds have a single battery life of up to 5 hours. With the charging case, a total of 25 hours of long battery life can be obtained, and it supports fast charging of “10 minutes of charging and 2 hours of listening to songs”. Baseus Bowie E2 earbuds are also equipped with the “Baseus Smart” App, which supports earphones operation customization.
|1. Baseus Bowie E2 charging case teardown
First remove the earphone bottom case along the parting line.
The charging case motherboard and the battery are fixed at the bottom of the headphone cockpit.
The main board of the charging case is fixed on the back of the headphone cockpit by screws, and the battery wire is soldered to one side of the main board and fixed with white glue.
Unscrew the screw and remove the charging case motherboard.
On the back of the headphone cockpit, there are 4 magnets for attaching the earphone.
The front of the charging case motherboard.
The back of the charging case motherboard.
The button board connected to the main board, there is a micro button on the small board corresponding to the button on the cockpit of the charging case, which is used for earphone pairing.
The charging case battery is from JHY, model 702025, rated voltage 3.7V, rated capacity 300mAh/1.110Wh.
Type-C charging interface female socket.
Pogo pin connector for charging earphone.
3R3 boost inductor, cooperate with the power management chip to boost to charge the earphones.
TPS SY8801 TWS earphone charging case SOC, specially designed for TWS earphone charging case. Based on 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, segmental adjustment of battery current, TWS earphone entry and 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 power management chip of TPS has been adopted by Xiaomi, OPPO, OnePlus, realme, Transsion, MEIZU, 1MORE, Baidu, Edifier, JBL, Harman, Lenovo and other brands.
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 battery is equipped with a circuit protection board, which has ICs, MOS tubes and thermistors to protect the circuit.
|2. Baseus Bowie E2 earbuds teardown
First, pry open the front and rear shells of the headphone along the parting line.
The internal structure of the earphone’s back shell, and the upper part is the acoustic sealing structure corresponding to the microphone pickup hole, which enhances the pickup performance of the microphone. A touch-sensitive touch patch is arranged in the middle of the rear shell, and the periphery of the touch patch is a bluetooth antenna.
The earphone motherboard is set above the earphone front shell.
Take out the earphone motherboard and fix the battery on the back of the motherboard.
The magnet inside the earphone’s front shell is fixed with transparent glue.
Remove the earphone battery, the front of the earphone motherboard.
The back of the earphone motherboard.
Soft pack battery silk screen information, model 451012, rated capacity 37mAh.
A metal post for charging earphones.
BLUETRUM BT8922D bluetooth audio SoC, using 40nm ULP process, built-in 32-bit high-performance RISC-V CPU, supports DSP instructions and neural network accelerators, built-in multiple small cores to form a multi-core architecture, effectively reducing power consumption. Built-in 2MB Flash storage unit, support FOTA, end users can upgrade earphone firmware through APP. Built-in GPIO pins, flexibly programmable pull-up or pull-down, support GPIO wake-up or interrupt. Built-in high-performance bluetooth RF circuit, the wireless receiving sensitivity reaches -94dBm, and the transmit power is greater than 10dBm, which meets different product designs and antenna structures.
BT8922D supports sound plus single MIC DNN call algorithm, providing users with a clear call experience. It supports Bluetooth 5.2 dual-mode, integrates step-down and lithium battery charging functions, and has built-in low-power touch buttons, which helps to achieve a streamlined earphone design.
According to 52audio, brands such as Monster, HYMALAYA, MEIZU, NOME, Transsion, LeTV, Lenovo, Philips, 360, Fantini, and AMOI have adopted BLUETRUM solutions in large numbers.
The clock crystal oscillator of silk screen “J.G” provides the clock for the bluetooth chip.
A step-down inductor outside the chip.
Integrated battery protection IC with silkscreen “0uB3”.
Laser engraved “G481 0J99” MEMS microphone for earphone’s voice call pickup.
The metal dome used to connect the earphone’s front shell touch patch, and the back is the bluetooth antenna contact.
EShine CT8233LF single-key touch IC, with LDO, reset time 16S, used for earphone touch control.
Remove earphone speaker housing.
Back of earphone speaker.
Take the earphone speaker out of the speaker housing, and the internal structure of the speaker housing.
After actual measurement, the size of the Baseus Bowie E2 earphones speaker unit is about 11.80mm.
All components of Baseus Bowie E2 true wireless earphones.
In terms of appearance, the Baseus Bowie E2 true wireless earphones have a more compact internal layout of the charging case to achieve a smaller overall volume. The design of earphones is similar to candy beans, and the weight of a single earphone is only 4.6g, which can bring users a lightweight wearing experience.
In terms of internal configuration of the charging case, the battery comes from JHY, model 702025, with a rated capacity of 300mAh/1.110Wh, which can provide users with an additional 20 hours of battery life. Using TPS SY8801 TWS earphone charging bin SOC, which is specially designed for TWS earphone charging bin, can realize the fast charging technology of earphones “charging for 10 minutes and listening to songs for 2 hours”, while also ensuring the stability of charging. The charging caseMCU adopts CHIPSEA CSU32P20, 8-bit RISC OTP MCU with 12-bit ADC, built-in 2K×16-bit OTP program memory, and 104-byte SRAM, bringing a smooth interactive experience.
In terms of internal configuration of earphones, the bluetooth SoC adopts BLUETRUM BT8922D bluetooth audio SoC, built-in 32-bit high-performance RISC-V CPU, supports FOTA, and end users can upgrade earphone firmware through APP. Support Sound+ single-MIC DNN call algorithm to provide users with a clear call experience. It supports Bluetooth 5.2 dual-mode, integrates step-down and lithium battery charging functions, and has built-in low-power touch buttons, which help to achieve a streamlined headphone design. The earphone touch chip comes from EShine CT8233LF single-button touch IC with built-in LDO, which can effectively prevent earphone from accidentally touching.