OnePlus launched the first Ace series true wireless earbuds – OnePlus Buds Ace at the recent OnePlus Ace 2 conference. This is specially designed for mobile game players and audio-visual lovers. It was recommended by the 2023 PEL, and created the “Game For Peace” personalized theme for the first time, providing exclusive notification sounds and “Game For Peace” personalized pop-up windows.
OnePlus Buds Ace is aimed at game scenes, and is also equipped with BassWave dynamic bass technology, which dynamically compensates for weaker low-frequency sound sources, and can independently adjust the bass intensity of the earbuds. Equipped with PEL sound effects, “Game For Peace” scene sound effects, gunshots, and footsteps are enhanced. Support Bluetooth 5.3 technology to provide faster and more stable connection. Game mode is supported, and the headphone latency is as low as 47ms.
OnePlus Buds Ace supports ANC function and is equipped with a dual-core noise reduction chip, which can effectively isolate noise by generating reverse noise reduction waves. Support transparent mode, wearing headphones can communicate without barriers. The built-in dual microphone unit accurately picks up sound and amplifies and enhances the human voice. With AI noise reduction algorithm and physical anti-wind noise design, clear and smooth game voice communication is guaranteed. In terms of battery life, the single battery life is up to 7 hours, and the comprehensive battery life is 36 hours. Support super fast charging – charge for 10 minutes, can play music for 5 hours.
52Audio has previously teardown the OnePlus’ products including: OnePlus Buds N, OnePlus Buds Pro, OnePlus Buds Z2, OnePlus Buds Z, OnePlus Buds, etc. Let’s take a look at the detailed teardown report of this product.
01/ OnePlus Buds Ace charging case teardown
First teardown the charging case, pry open the case, and take out the charging cockpit structure.
The bottom structure of the charging cockpit is fixed with 5 magnets by glue, which are used to absorb earbuds and charging case cover.
The internal structure of the cavity, the motherboard is fixed on the bottom by screws, and the battery is fixed on the side cavity wall.
Remove the screws, take out the motherboard and battery. The battery is wrapped with a sponge to prevent damage from falling.
The rechargeable lithium-ion battery equipped with the charging case, model: 751443, rated capacity: 480mAh 1.77Wh, typical capacity: 490mAh 1.81Wh, nominal voltage: 3.7V, charging limit voltage: 4.35V, manufacturer: Chongqing VDL Electronics Co. , Ltd.
Tear off the outer insulating plastic skin, silkscreen information on the cell, model: VDL 751443, nominal voltage: 3.7V, rated capacity: 480mAh 1.76Wh.
The circuit on the side of the motherboard of the charging case.
The circuit on the other side of the charging case motherboard.
The silk screen 4002 2rBT Hall element 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 the connected device.
Bluetooth pairing function button.
There are two Pogo Pin connectors for charging the earbuds, and the bottom is equipped with a sponge pad to seal and waterproof.
TPS SY8801 bluetooth earphone intelligent 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 charging case design, greatly simplifies peripheral circuits and components, and provides an easy-to-use solution for charging case.
According to 52Audio, TPS power management chips have been used by OPPO, vivo, realme, OnePlus, Edifier, QCY, Baseus, Soundcore, JBL, Philips, Jabra, Nothing, Marshall, DENON, Xiaomi, 1MORE, 233621, Sabbat, Creative, HARMAN, Lenovo and other brands use.
The peripheral power inductor of the power management chip cooperates with the power management chip to charge and discharge the battery.
Silkscreen 23P TVS for input overvoltage protection.
TPS SY8702 low-side overvoltage protection (OVP) IC, in SOT23-6 package, integrates 28mΩ switch NMOS inside. The low-voltage side switch topology is adopted, the extremely low on-resistance effectively reduces the input voltage drop, and the external setting of the protection voltage makes the application more flexible, providing the simplest and most practical low-cost OVP solution.
Screen printing UsG regulator IC.
Two LED indicators of different colors are used to feedback the bluetooth pairing and charging status of the charging case.
Cmsemicon CMS8S5889 MCU microcontroller for charging case control. It has a maximum 32KB program area, 256B RAM space, 2KB XRAM, and 1KB non-volatile data area. It supports three working modes: normal, idle, and sleep, which can effectively reduce power consumption. With 1 I2C, 1 SPI, 2 UART communication modules, it can realize data transmission between the system and other devices. With high-precision 12-bit ADC and optional internal reference voltage.
iCM CM1112-WAE lithium battery protection IC. CM1112 series 2-in-1 protection chip is specially designed for charging case battery, with built-in high-precision voltage detection circuit and delay circuit. By detecting the voltage and current of the battery, the overcharge, overdischarge and overcurrent protection of the battery can be realized.
iCM CM1112 series products are ultra-small and ultra-thin DFN2.2*2.9*0.5mm package, which can achieve ultra-low 1.5uA static power consumption and 10nA sleep power consumption. And built-in discrete NMOS with ESD protection, very suitable for lithium battery protection in charging cases, smart watches and other equipment.
According to 52Audio, iCM lithium battery protection IC has obtained products from OPPO, vivo, realme, IQOO, OnePlus, Soundcore, AUKEY, Skullcandy, realme, ZTE, Jabra, QCY, Monster, Huawei, Honor, Lenovo, Haylou and other brands use.
02/ OnePlus Buds Ace earbuds teardown
Enter the earbuds teardown section and open the headset stem cavity.
The internal wiring circuit of the earbud head, the battery inside the cavity is covered with a sponge pad to isolate it from the main board.
The bluetooth antenna and touch detection sensor circuit fixed at the bottom of the cavity are connected to the motherboard with exposed copper. An acoustic structure with microphones arranged at both ends.
Microphone rubber sealing cover, anti-wind noise design, avoid direct blowing. The other side uses the same structural design.
The circuit on one side of the headphone motherboard.
The circuit on the other side of the headphone motherboard, the cable is soldered to the motherboard.
BES BES2600IHC3 bluetooth Audio SoC. BES2600IHC series adopts dual-core Arm MCU, supports Bluetooth 5.3, and integrates BES self-developed AI noise reduction call algorithm, hybrid ANC algorithm and ANC self-calibration algorithm. Integrated Charge, power consumption as low as 4.5mA, is a low-cost, cost-effective product.
According to Audio, BES solutions have been adopted in true wireless earphones of OPPO, Xiaomi, Samsung, vivo, Honor, Redmi, IQOO, JBL, 1MORE, OnePlus and many other brands.
The MEMS microphone of laser carving ME45 D127 is used for voice call function to pick up human voice, from MEMSensing.
iCM CM1126B-WAC is a two-in-one single-cell battery protection IC with shipping mode, built-in high-precision voltage detection circuit and delay circuit. By detecting the voltage and current of the battery, the overcharge, overdischarge and overcurrent protection of the battery can be realized. The protection circuit is suitable for single-cell lithium-ion/lithium polymer rechargeable batteries, and it also has a shipping mode, so that the small-capacity battery pack can meet the needs of sea transportation and long-term storage.
Three metal dome for connecting the bluetooth antenna and the touch detection sensor.
HYNITRON HK31BP high-performance self-capacitance touch chip for touch control function. HK31BP has a built-in voltage regulator module/low voltage reset module, supports hardware dejitter/environment adaptive algorithm, etc., has strong anti-interference performance, and can be configured into multiple modes through pins.
The 26.000MHz crystal oscillator provides the clock for the bluetooth audio SoC.
Another MEMS microphone of laser engraving ME45 D127 is used for active noise cancellation and call noise reduction to pick up external environmental noise.
Disassemble the earbud head cavity. The internal structure of the front cavity, the battery is fixed on the black frame, isolated from the sound cavity.
Take out the battery and black frame.
The structure on one side of the frame fixes the battery through card slots and glue.
The structure on the other side of the frame is fixed with a magnet, which is used to absorb the charging case and fix it.
Disconnect the cable and remove the battery.
The inside of the earbud uses a soft pack button battery, model: 1058, voltage: 3.8V, capacity: 41mAh 0.166Wh, from Ganfeng Lithium.
Loudspeaker unit structure.
Take out the speaker. The internal structure of the front chamber, two metal connectors for charging the earbuds are fixed on the wall of the chamber, and the tuning hole is protected by a fine dust-proof net.
The front diaphragm of the dynamic driver uses a titanium-plated composite diaphragm.
On the back of the dynamic driver, there is a tuning hole on the edge, protected by a dust filter, and connected to the cable by welding.
All components of OnePlus Buds Ace true wireless earphones.
In terms of appearance, OnePlus Buds Ace adopts the same design as OnePlus Buds N. The “runway-type” charging case adopts two different crafts to collide and assemble, which has personalized characteristics. The handle-shaped in-ear earbuds and headset stem also adopt the oval “runway” design, which is highly recognizable. The touch area uses decorative sheets and CD textures with different textures from the body to make the product look more refined.
In terms of internal structure and configuration, the charging case includes a battery and a motherboard unit. Built-in battery capacity 480mAh, from VDL. The motherboard is equipped with a TPS SY8801 power management chip, which integrates a charging module and a discharging module, responsible for battery charging and discharging management. The iCM CM1112-WAE lithium battery protection IC is responsible for charging protection. TPS SY8702 low-side overvoltage protection (OVP) IC, Cmsemicon CMS8S5889 MCU microcontroller, etc. are also used.
The earbud is equipped with a titanium-plated composite diaphragm dynamic driver and two MEMSensing MEMS microphones. The main control chip is BES BES2600IHC3 bluetooth audio SoC, designed with low power consumption, supports Bluetooth 5.3, and integrates BES self-developed AI noise reduction call algorithm and hybrid ANC noise reduction algorithm. Touch detection uses HYNITRON HK31BP chip. The earbud has a built-in Ganfeng Lithium 41mAh soft-pack button battery, and is equipped with an iCM CM1126B-WAC two-in-one single-cell battery protection IC with shipping mode.