At the Bose Audio New Product Launch Conference in 2020, Bose released 6 new products at one time, including Bose QuietComfort Earbuds, Bose Sport Earbuds and Bose Sleepbuds II. The product line is fully upgraded.
Today 52audio will disassemble the Bose Sport Earbuds. The full name of the product is “Bose Sport Earbuds”. This product adopts the same new design as the Bose noise canceling earbuds, but is smaller and lighter. A single earphone weighs 6.75g. Equipped with advanced version of shark fin earwings to ensure the stability of sports wear, IPX4 waterproof level is suitable for sports and outdoor use.
Bose Sport Earbuds supports Bose dynamic sound quality equalization technology, which automatically enhances the bass and treble effects; the earphone supports double-click, long-press and touch interaction modes, and it has a built-in Tencent small and micro voice assistant; the Bose Music App can customize the settings for the above functions. In terms of battery life, Bose Sport Earbuds has a battery life of about 5 hours in a single time, and it can last up to 15 hours with a charging case. The earphone supports fast charging for 15 minutes and 2 hours of listening to music. Please see the detailed disassembly below.
Bose audio products disassembled by 52audio include: Bose QuietComfort Earbuds true wireless noise reduction headphones, Bose SOUNDSPORT FREE true wireless bluetooth headphones, Bose NC700 active noise reduction bluetooth headset, Bose QuietComfort 35 II active noise reduction bluetooth headset and Bose smart audio glasses.
| 1. Bose Sport Earbuds charging case teardown
After unpacking the box, we have a comprehensive understanding of the exterior design of the Bose Sport Earbuds. The charging case is similar in appearance to the Bose noise-cancelling earbuds, but it is lighter in weight and has a more compact internal layout. Next, we will enter the dismantling process. Which chips are used.
Pry open the charging cockpit and connect multiple physical buckles. There are multiple cushioning foams where the battery and the casing are in contact.
The physical switch structure of the box cover, the edge of the box is filled with waterproof glue.
The two PCBAs are connected through a flexible flat cable and a connector.
In the inner structure of the charging cockpit, the Pogo Pin is connected to the PCBA through a wire.
The solder joints between the Pogo Pin and the wire are sealed with glue.
The solder joints between the Pogo Pin wire and PCBA are reinforced with blue glue.
The other side of PCBA.
Remove the silicone keycaps of the physical keys.
Micro-motion button, long press can make the earphone quickly pair with a new device.
TI DRV5032 low-power Hall sensor is used to detect charging case when the cover is opened to realize the function of connecting when the cover is opened.
Charging case internal structure display.
Light guide at the position of the battery indicator.
The material information and coding information on the inside of the shell are made of PC+ABS material.
The battery is fixed on the motherboard and removed together.
The other side structure.
The PCBA where the charging interface is located is connected to the motherboard through six wires.
The other side of the charging interface PCBA.
There is a dustproof and waterproof rubber ring inside the USB Type-C charging interface.
The input terminal is protected by TVS and self-recovery fuse.
Charging case The circuit on the main PCBA side, exposed copper vias at the chip for heat dissipation.
charging case The other side of the main PCBA circuit.
NXP QN9080 32-bit ARM Cortex-M4 bluetooth low energy microcontroller.
QN908x is a high-performance bluetooth low energy SoC single-chip platform with 10mW peak power, suitable for bluetooth smart applications. NXP QN9080 integrates bluetooth low energy (v5.0) compatible radio, link controller, Host protocol stack and multiple GATT profiles, thus providing a single-chip solution for bluetooth smart applications. The integrated 32-bit ARM Cortex-M4F MCU with on-chip flash memory and a variety of analog and digital peripherals can provide a more efficient data fusion engine. This feature makes it an excellent solution for computing applications that require a large number of sensor fusion.
Other system features of the NXP QN908x include a fully integrated DC-DC converter, LDO, low-power sleep timer, battery monitor, high-resolution ADC and GPIO. These features can reduce overall system cost and size. The power supply voltage range of QN908x is 1.62 V to 3.6V. It has very low working current and ultra-low power consumption sleep mode, which can extend battery life.
NXP QN908x functional block diagram.
A printed snake-shaped bluetooth antenna is used to transmit wireless signals.
BSS138DW dual NMOS.
The earphone charging case adopts TI BQ24079 1.5A linear charger, supports 28V input withstand voltage, built-in overvoltage protection function, and supports path management for power input protection and charging case built-in battery charging.
Silk screen 4F IC.
TI TPS610997 synchronous boost IC, used to boost the built-in lithium battery to charge the earphone.
TI TPS62743 synchronous rectification step-down converter, used for battery output step-down to supply power for MCU and other chips.
The charging case uses a soft pack battery, model AHB572535, with a rated capacity of 1.85Wh.
The label information on the other side of the battery, model AHB572535, rated voltage 3.7V, rated capacity 500mAh/1.85Wh, made in China.
The battery protection board is protected by glue to provide battery overvoltage, overdischarge and overcurrent protection.
Five LED indicators are separated by a black shell to avoid light leakage.
| 2. Bose Sport Earbuds teardown
Let’s continue to disassemble the earphone part of Bose Sport Earbuds. Compared with Bose denoising earbuds, Bose Sport Earbuds are smaller and lighter.
On the surface of the shell, there is the Bose brand Logo. The left earphone supports double-click, and the right earphone supports long-press and double-click. The volume adjustment function can be enabled in the mobile APP.
The design of the left and right earphones is different. There are a little array of openings on the right earphone shell, which are used to pick up ambient sound during a call and assist the noise reduction function of the call.
There are also a few holes on the bottom shell of the right earphone, while the left earphone does not. The common dot opening is the indicator light.
There is a microphone in the dot matrix opening to pick up human voices during a call.
The opening of the infrared optical sensor is used for ear detection.
The strip pressure relief hole balances the air pressure inside the earphone.
There is also a strip-shaped pressure relief hole near the infrared optical sensor near the mouthpiece for tuning.
A fine dust-proof net at the mouthpiece.
The charging contacts of the earphone and the magnets that absorb the charging case.
The word “IPX4” on the shell represents the waterproof level of the earphone.
The advanced version of shark fin silicone earmuffs, the earwings part provides support, the auricle part is designed to fit the curve of the human ear, and the umbrella structure of the earphone sound hole fits the ear canal, improving the airtightness of the ear canal.
There is the Bose logo on the inside of the earmuffs.
Disassemble the earphone shell along the parting line.
The speaker unit, sensor, and charging contacts in the sound cavity are connected to the main board through FPC and connectors.
The internal structure of the right ear.
Let’s take apart the left earphone again.
The internal structure of the left earphone.
Comparing the left and right earphone shells, the left earphone does not have a capacitive touch sensing FPC, so it only supports double-click operation.
The internal structure of the sound cavity of the left and right earphones is similar. There are two microphones in the right earphone for calls.
The layout of the left and right earphone motherboard circuits is slightly different.
Let’s first take a look at which chips are used in the right earphone.
The FPC used for touch detection has coded information on it.
The sound pickup holes of the call microphone are arranged in a dot matrix with a dust-proof net inside.
The mezzanine in the housing integrates a bluetooth antenna, which transmits signals through the contact and the Pogo Pin on the motherboard.
The touch detection FPC is pasted on the shell using double-sided tape.
Cypress PSoC 4000S series MCU for touch detection.
The Pogo Pin connected to the bluetooth antenna is thinner.
The Pogo Pin connected to the positive terminal of the battery is slightly thicker.
The gold-plated contacts connected to the negative pole of the battery are cleverly placed on the edge of the motherboard.
The size comparison between the motherboard and RMB coin.
Circuit on the motherboard side.
Circuit on the other side of the motherboard.
A protective cover is designed at the microphone to improve the pickup ability.
Laser carving VN20 1808 MEMS silicon microphone.
Silkscreen O4P NP IC.
The integrated battery protection IC of silk screen 651RF1M9.
Silkscreen 157 T942 004 IC.
The memory IC of the silk screen Q128J WYIQ 1949.
Silkscreen 73 SE IC.
The main control chip of Bose Sport Earbuds is Qualcomm QCC5127. Qualcomm QCC5100 series chips integrate digital active noise cancellation technology, quad-core processor architecture, built-in dual-core DSP audio subsystem, support the latest TWS+ technology, that is, dual-channel synchronous transmission technology, wireless latency is lower, and more valuable is that in the voice Compared with previous calls and music streaming, the power consumption can be reduced by up to 65%. However, Bose wireless earplugs do not support active noise reduction. Qualcomm QCC5127 mainly plays the role of audio processing, call noise reduction and bluetooth signal processing.
It is understood that BOSE, SONY, 1MORE, Edifier, vivo and other brands have adopted Qualcomm solutions in large numbers.
Qualcomm QCC5127 details.
Continue to disassemble the sound cavity part.
The nickel sheet on the positive electrode of the battery is in contact with the edge of the main board.
The nickel sheet on the negative pole of the battery is in contact with the Pogo Pin on the motherboard.
A large amount of sealant is used at the joints of the shell to improve the ability of dust and water resistance.
Remove the button battery.
The size comparison of button battery and RMB coin.
The button battery supplier comes from VARTA, model CP1254 A3, diameter 12mm, height 5.4mm, rated voltage 3.7V, rated capacity 0.2Wh.
According to 52audio, many world-renowned brands including Apple, Samsung, Sony, BOSE, B&O, Microsoft, Amazon, Jlab, etc. have adopted VARTA button batteries in large numbers.
The other side of the battery is covered with yellow high temperature insulating tape.
The internal circuit of the sound cavity.
Laser carving VN20 1814 MEMS silicon microphone.
Three LED indicators, the white gasket on the top plays a soft light effect.
There is a large amount of sealing glue in the sound cavity to fix the FPC and the battery. This position is the charging contact of the earphone.
Infrared optical sensor for in-ear detection function.
The connector of the speaker unit FPC and the motherboard.
The unit’s inverting hole part uses a separate plastic module.
Disassemble the shell at the ear, there is a speaker unit inside.
The shell is also sealed with a large amount of glue to improve dust and water resistance. There is a small magnet in the middle of the shell to strengthen the magnetism of the speaker, and the opening is used to pass the speaker cable.
The bass reversal hole located at the edge of the sound cavity.
On the side of the speaker unit, an infrared distance sensor is also placed under the unit for in-ear detection. The in-ear detection component configuration is the same as the Bose QuietComfort Earbuds true wireless noise-cancelling headphones.
The speaker unit size is about 9mm.
Let’s take a look at the components in the left ear. There is no FPC for touch detection inside the shell, and the shell has an integrated antenna.
Circuit on the motherboard side.
Circuit on the other side of the motherboard. Most of the ICs on the left earphone motherboard are of the same model as the right ear, except that an acceleration sensor has been added (see the figure below).
An acceleration sensor with silk-screen FA CN8 detects the tapping operation.
All components of Bose Sport Earbuds true wireless bluetooth earphones.
Bose Sport Earbuds is Bose’s new generation of basic true wireless bluetooth earphones. It was released at the same time as Bose Sleepbuds™ II. There are many similarities in appearance design to structural design and materials, and they are distinguished in function.
The Bose Sport Earbuds charging case is relatively flat. The power is input through the USB Type-C interface. The charging case has a built-in NXP QN9080 high-performance bluetooth low energy SoC single chip, which is responsible for battery charging and discharging, charging case control and other functions, and can pass bluetooth It is connected to the mobile phone for easy firmware upgrade. The charging case also uses TI Hall sensors, linear chargers, synchronous boost ICs, synchronous rectification and step-down converters to realize complete power management; soft pack battery capacity is 500mAh. The charging case does not support wireless charging. Although it is not waterproof, there are protective measures at the joints of the charging interface and the charging cockpit.
In the earphone part, Bose Sport Earbuds uses Qualcomm’s flagship chip QCC5127, supports bluetooth 5.1, is responsible for audio processing, call noise reduction and bluetooth signal processing, etc.; the right earbud uses two microphones for calls, supports multiple touch operations, and the left earphone If there is no microphone, the accelerometer supports tapping operation. Pay attention when using it; the earphone retains the dual optical in-ear detection design of Bose Sleepbuds™ II. The speaker unit size is the same 9mm but the materials are different, and the bass port takes up less space; The button battery comes from VARTA with a rated capacity of 0.2Wh and 54mAh.
From the disassembly point of view, Bose Sport Earbuds retains some of the selling points of the Bose QuietComfort Earbuds flagship product. For example, the charging case uses a bluetooth SoC chip, the earphone uses advanced shark fin earwings, supports dual optical in-ear detection, and bass inverted holes to enhance sound effects Wait. And the product is smaller in size and lighter in weight. It supports IPX4 waterproof and sweat proof. Like the product name, it is suitable for consumer groups who like sports and do not need active noise reduction.