On January 14, 2021, Samsung Electronics released three smartphones in the Samsung Galaxy S21 series to the world, as well as Samsung’s new true wireless earphones Galaxy Buds Pro and Samsung Galaxy Smart Tag tracker. Samsung mobile phones no longer come standard with AKG wired earphones.
Today we are going to teardown the Samsung Galaxy Buds Pro. 52audio has analyzed the design highlights of this product for you in the form of a long article. There are mainly the following three points: intelligent active noise reduction function, and at the same time Support voice detection, no need to take off the earphones when talking and talking; adopt a new type of dual dynamic driver design, support 360° sound effects, Dolby panoramic sound, auditory assistance functions, and richer audio experience; chip adopts SiP package, call noise reduction adopts three microphones + The hardware configuration of the voice pickup unit has been upgraded. Let’s take a look at 52audio’s detailed teardown report.
The Samsung headphones teardown by 52audio, including: Samsung Galaxy Buds Live, Samsung Galaxy Buds+, Samsung Galaxy Buds, Samsung Gear IconX 2018 and Samsung Gear IconX.
| 1. Samsung Galaxy Buds Pro charging case teardown
After opening the box, we have a comprehensive understanding of the appearance of Samsung Galaxy Buds Pro true wireless earbuds. Next, we will enter the disassembly process to see if its internal structure continues Samsung’s highly integrated and modular features.
Pry open the charging cockpit and connect the interior through multiple buckles. There is a FPC inside the charging cockpit shell to connect with the motherboard.
The FPC is connected to the motherboard through the BTB connector.
Disconnect the FPC and charge the inner structure of the cockpit shell.
Separate the bracket for fixing the FPC and the charging cockpit shell.
On the shell of the charging cockpit, the light guide at the indicator position has black rubber on the outside to avoid light leakage.
A close-up of the bracket holding the magnet and Pogo Pin. The two magnets that hold the earphones up and down have a certain arc.
There is a dustproof and waterproof rubber ring at the bottom of the Pogo Pin.
The structure on one side of the charging cockpit shell.
The Pogo Pin for charging the earphones, the flexible FPC is easy to adapt to the internal structure.
Two LED indicators, one is used to indicate the status of the earphones, and the other is used to indicate the charging status of the charging case.
Screen printing KZOmD Hall element. The magnetic field changes when the charging case cover is opened and closed will be sensed by the Hall element, and the charging case will be notified to the MCU and earphones to pair or disconnect with the connected device.
Internal structure of charging case. The battery module is placed obliquely. Below is the main board circuit. Both are fixed by a set of screws. The bottom is the wireless charging receiving coil module, which just jams the battery module.
Remove the screws and take out the battery module first.
On one side of the battery module, two square grooves just fix the FPC bracket.
The other side of the battery module.
The positive and negative contacts of the battery are on one side of the casing.
The battery module housing adopts a snap structure.
Open the case to see the battery inside.
The battery core is fixed on the shell with double-sided tape. Code on the inside of the shell, SM-R190 is the product model, and the shell is made of PC material.
The charging case uses a soft pack battery. The supplier is Tianjin Samsung Vision Co., Ltd., model “EB-BR190ABY”, with a nominal voltage of 3.85V ⎓/charging limit voltage of 4.4V ⎓.
The battery has a capacity of 472mAh and an energy of 1.81Wh.
Code information on the battery cell.
Battery protection board.
The protection board is an integrated lithium battery protection IC, which is reinforced with glue. Responsible for battery overcharge, overdischarge and overcurrent protection.
The internal structure after taking out the battery, the cover part of the box is fixed by screws, and the bottom part is the wireless charging receiving coil, which is also fixed on a bracket.
The structure of the box cover shaft, the magnet is used to adsorb and fix the box cover when it is opened, and keep it open.
The internal structure seen after removing the cover part. The USB Type-C charging port is reinforced with a metal protective cover and fixed with screws.
For the holes of the screws at the junction of the box cover, use a high-cost special copper nut for injection molding.
Fix the metal protective cover of the USB Type-C charging interface to improve the reliability of the charging cable when plugging and unplugging.
Take out the wireless charging receiving coil and main board.
charging case Light guide plate at the position of the charging indicator.
For various coding information on the shell, SM-R190 is the product model, and the shell is made of PC material.
Charging case internal main circuit.
The other side of the circuit structure.
The wireless charging receiving coil has number information in the middle.
Wireless charging receiving coil, single-strand enameled wire winding.
On the side of the motherboard circuit, there are mainly some RC components.
On the other side of the motherboard circuit, there is a highly integrated power management chip.
The supplier of the USB Type-C charging interface is South Korea JNTC.
There is a screen-printed HJKUG input protection chip at the charging interface.
The charging case main control chip is the integrated power management chip MUA01 developed by Samsung. This is the industry’s first solution to support wireless and wired charging in a single chip. The peripheral circuit is very streamlined. Previously, it was used in Galaxy Buds Live true wireless noise reduction headphones and Galaxy Buds+ true wireless bluetooth earphones have applications.
Samsung MUA01 supports the Qi 1.2.4 wireless charging standard of the Wireless Power Consortium (WPC). In order to provide effective power management, MUA01 integrates an efficient switching charger; MUA01 also has a built-in MCU and embedded flash memory (eFlash), which can upgrade firmware over the air , Reduce the use of peripheral components and reduce the board area.
The bottom left corner is the solder joint of the wireless charging receiving coil, and the capacitor used for wireless charging receiving on the periphery of the chip is protected and reinforced with glue.
The capacitive element on the back of the power management chip is protected and reinforced with glue.
The metal dome connecting the positive and negative poles of the battery, on the right is the 12Pin BTB connector.
| 2. Samsung Galaxy Buds Pro earphones teardown
Let’s continue to disassemble the Samsung Galaxy Buds Pro earphones. The earphones are designed with bean-shaped earphones. Compared with the previous generation, the shell has a larger curvature and a very smooth surface. The waterproof level of the earphones has also been increased to IPX7.
The earphone shell supports touch function, supports single click and long press.
The sound pickup hole on the top of the shell contains the feed-forward microphone of the earphone for active noise reduction, call noise reduction and environmental sound functions.
The dot matrix opening at the bottom of the earphone has a microphone for talking inside and a sound guide structure, which is designed for wind noise resistance.
The pressure relief/tuning hole on the top of the inner side of the earphone is officially advertised as a vent, which reduces obstruction and creates a wide range of sound effects.
The charging contacts of the earphones.
The opening window of the infrared optical sensor is in the middle of the two charging contacts, and there is the L/R logo of the earphone next to it.
Another infrared optical sensor is located at the bottom of the earphones.
The sound mouth is elliptical and adopts metal dust-proof net to prevent foreign matter from entering.
The silicone eartips of the earphones are also equipped with a dust-proof net for double protection.
Disassemble the earphone along the parting line, there are FPC inside to connect the components on both sides.
FPC connection.
Disconnect the FPC and see the internal structure. The FPC on the motherboard side is connected with the 20Pin BTB connector on the sound cavity side.
Let’s first look at the structure on the side of the motherboard. The earphone shell is an embedded design, and the inner ring has a thicker glue for sealing.
The motherboard does not completely occupy the internal space, so it is tilted to make room for the battery. The motherboard is fixed on the shell with screws, and the product model and L/R logo are on the motherboard.
The internal structure of the earphone shell after removing the motherboard. The shell adopts injection molding process.
Both microphone positions use a waterproof rubber ring and a special material that is breathable and impermeable. The bluetooth antenna and touch sensing device of the earphones are integrated inside the housing, and are connected to the main board through metal contacts and dome.
The size comparison of the earphones motherboard and CNY coin.
On the other side of the motherboard, there is a metal dome connecting the bluetooth antenna and the touch area on the side.
The main control chip of the earphones is a SiP (System in Package) chip with the Samsung brand name printed on it.
Laser carving 049 BFC’s MEMS silicon microphone is used for call pickup.
The MEMS silicon microphone of LaserDiao S259 0455 3010 is a feedforward microphone for earphones.
Silkscreen 356H IC.
Samsung’s self-developed MUB01 chip integrates five components (fuel gauge, DC/DC converter, linear charger, low dropout/LDO regulator and reset IC) into a single chipset, saving board space, and charging case The MUA01 in the kit supports firmware update. It was previously used on the Galaxy Buds Live true wireless noise reduction earphones and Galaxy Buds+ true wireless bluetooth earphones.
Cirrus Logic CS47L63 low-power audio digital signal processor.
According to 52audio, well-known brands including Apple, Samsung, Huawei, Amazon, Xiaomi, and Meizu have adopted Cirrus Logic audio chips.
ST LSM6DSL, a high-performance 6-axis sensor, integrated acceleration and gyroscope, mainly to achieve the tap function and head rotation tracking, used to achieve the 360-degree audio function of the earphones.
The ST LIS25BATR high-bandwidth voice acceleration sensor is applied to the voice detection function and call noise reduction function of the earphones. Compared with the traditional dual Mic solution, the bone vibration sensor has better suppression of wind noise/environmental noise.
According to 52audio, audio products from brands including Apple, Amazon, Samsung, Huawei, Xiaomi, vivo, and Edifier all use ST sensors.
The screen-printed KZOmD Hall element is used to more accurately determine the state of the earphones in/out of the charging case.
Let’s take a look at the structural layout in the sound cavity. There is an FPC in the sound cavity connected in series with internal components.
The solder joints of the positive and negative poles of the battery are on the side, and the solder joints are reinforced with glue, and at the same time play a role of insulation.
The FPC welding position of the speaker unit is also reinforced with red glue.
Weld the two solder joints and continue dismantling.
There is a pink frame inside the earphone to fix the battery and PCB, while separating the sound cavity of the earphone.
The other side of the button battery.
A small piece of plastic structure on the battery serves as a fixed side FPC and insulation.
The button battery supplier is Samsung SDI Co., Ltd. The battery model is NS1250, with a diameter of 12mm, a thickness of 5.0mm, a rated voltage of 3.85V, and a rated capacity of 58mAh.
The strip-shaped magnetic isolation sheet corresponds to the shape of the nickel sheet of the battery.
Take out the pink bracket holding the battery, you can see the internal structure of the sound cavity.
The pink bracket inside the earphones.
Magnetic isolation sheet at the position of the speaker unit.
The magnet that attracts the charging cockpit.
Information on the speaker unit, J0C21G C23A HF.
The location of the earphones charging contacts and the infrared optical sensor.
Dust net inside the tuning hole.
In the structure inside the mouthpiece, there is also a layer of black protective net woven more densely inside the metal dust cover.
The second magnet that attracts the charging cockpit.
The opening window at the second infrared optical sensor position is a filter protection cover.
The complete circuit display in the sound cavity is composed of multiple FPCs welded together.
The other side of the circuit.
The circuit in the sound cavity is finally connected to the motherboard through the BTB connector on the PCB.
Integrated battery protection IC with silkscreen 705010.
This FPC is connected to the two charging contacts of the earphones and two infrared optical sensors.
Infrared optical sensor for in-ear detection function.
The position of the back-feed microphone is near the sound hole.
Laser carving S259 0404 300K MEMS silicon microphone.
The tuning hole on the side of the dual speaker unit has a dust-proof protection net.
One side of dual speaker unit.
The coaxial double moving coil unit design is composed of an 11mm woofer + a 6.5mm tweeter, adjusted by AKG, and the sound effect has been certified by Harman.
The widest point of the dual speaker unit is about 11mm.
The thickness of the dual speaker unit is about 5mm.
All components of Samsung Galaxy Buds Pro TWS earbuds.
| Summary
Samsung Galaxy Buds Pro is a summary of the development of the Galaxy Buds series of true wireless earphones. You can see the shadow of many previous generation products on the hardware of this product. At the same time, it has a larger update in software functions, and it is matched with Samsung flagship mobile phones. Use will have a more complete audio experience.
The Galaxy Buds Pro charging case uses a square clamshell design with a matte texture and metallic luster. Its appearance and size are the same as those of the Galaxy Buds Live charging case, but due to changes in the shape of the earphones, the internal structure of the two is different. In the Galaxy Buds Pro charging case, the battery module is placed obliquely to make room for the earphones. Due to the high integration of the power management chip, the motherboard area is not large, and the remaining space can be effectively used. The battery, FPC and wireless charging receiving coil inside the charging case are all fixed with plastic brackets, the charging interface uses a metal protective cover, and the screw holes use injection-specific copper nuts and other detailed designs are also characteristics of Samsung true wireless earphones.
Galaxy Buds Pro charging case has built-in Samsung integrated power management chip MUA01, supports wireless charging and wired charging two power management solutions, and also integrates MCU, flash memory, etc., which is an ideal TWS charging case single-chip solution; soft pack battery The supplier of is Tianjin Samsung Vision, and the supplier of USB Type-C charging interface is South Korea JNTC.
In the earphone part, Samsung Galaxy Buds Pro adopts bean-shaped ear design, the shell has a large curvature, and the surface is very smooth. The ear shell has a progressive design to share the weight of the earphone and make it more comfortable to wear; the inner structure of the earphone is clear and waterproof Measures are in place, the sound cavity is independently sealed; core components have also undergone major upgrades, including: Samsung’s independent research and development of bluetooth audio SoC with SiP package, coaxial dual dynamic driver, Samsung SDI button battery, Cirrus Logic CS47L63 DSP, etc. .
Galaxy Buds Pro has three microphones, two of which are used for active noise reduction. Three microphones are used with ST voice acceleration sensors to achieve call noise reduction. The voice detection function also uses this sensor; the newly upgraded 360° sound effect of the earphones The data is collected through ST’s high-performance 6-axis sensor. The functions mentioned above need to be implemented in conjunction with related algorithms.
The above disassembly basically verifies that 52audio mentioned in the previous highlight analysis article that Samsung Galaxy Buds Pro integrates all the popular technical directions in the current true wireless earphones market, including hardware and software, and product design and production modules. The proportion of self-developed components is relatively high, and the appearance, quality and price of the final product are satisfactory. This may be the most complete form of the Galaxy Buds series of true wireless headphones.
Source: 52audio
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