ZTE’s performance in the TWS headset market is silent and has only launched a few products so far. At the Axon30 series conference in the middle of this year, ZTE released ZTE LiveBuds Pro and ZTE Buds true wireless headphones. The former is a product that supports active noise reduction. It also supports transparent transmission mode, six-mic call noise reduction, game mode, and has a 24-hour overall battery life.
In terms of acoustic configuration, ZTE LiveBuds Pro uses a combination of 10mm dynamic driver + polymer composite diaphragm. At the same time, an independent sound cavity structure and ZTE’s unique adjustment algorithm are also designed to achieve balanced performance of high, medium and low frequencies, presenting a dynamic low frequency and a clear and bright high frequency sound quality. Let us take a look at the internal structure configuration information of this product.
|1. ZTE LiveBuds Pro charging case teardown
After unpacking, we learned about the overall design of this product. Let’s enter the teardown section to see the internal structure configuration information.
Pry open the charging case and take out the cockpit structure.
The internal structure of the charging case.
The charging case motherboard is fixed on the bottom of the cockpit by screws.
A battery unit is fixed on one side of the cockpit.
On the other side of the cockpit, there is a vertical PCB board with indicator lights and Hall elements.
Remove the screws and remove the main components from the cockpit.
The bottom structure of the cockpit is provided with multiple magnets for absorbing the charging case cover and earphones.
The circuit on the side of the main component in the charging case.
The other side of the main assembly.
The charging case uses a lithium-ion soft pack battery, model: TMB 801435, rated voltage: 3.7V, rated capacity: 420mAh/1.55Wh, from Zhongshan Tianmao Battery Co., Ltd.
The battery is equipped with a circuit protection board and an integrated lithium battery protection IC.
iCM CM1102B-GD lithium battery protection IC. The CM1102B series has a built-in high-precision voltage detection circuit and delay circuit. By detecting the voltage and current of the battery, it can protect the battery from overcharge, overdischarge, and overcurrent. It is suitable for the protection circuit of single-cell lithium ion/lithium polymer rechargeable batteries.
The charging case front circuit of the motherboard.
On the back of the charging case main board, there is a sponge pad for protection at the junction with the cockpit.
The vertical small board is welded vertically on the main board, and the indicator light is provided with a sponge wrap to prevent light leakage.
The LED indicator is used to feed back the power information of the charging case.
A Hall element with silkscreen 201A is set at the end of the small board to sense the magnetic field changes when the charging case cover is opened and closed, and notify the charging case MCU and earphones to pair or disconnect with the connected device.
Type-C charging interface female socket.
INJOINIC IP5513 TWS headphone charging compartment management SoC, using SOP16 package, is a multifunctional power management SoC integrating 5V boost converter, lithium battery charging management, battery level indicator, providing a complete power solution for TWS bluetooth headphone charging compartment .
The high integration and rich functions of IP5513 enable it to require very few peripheral components in application, and effectively reduce the size of the overall solution and reduce the BOM cost. To
According to 52audio, there are already a large number of TWS headphone charging cases of Edifier, JLab, HiBy, Baseus, Pioneer, PIHEN, BULL, AUKEY, MPOW, BoAt, Nokia, Lenovo and other brands that use INJOINIC power management solutions.
The 2R2 boost inductor is used with the power management chip to boost the headphone for charging.
The IC of the silk screen 14C1S.
The TVS of the silk screen BZ-V is used for overvoltage suppression.
Pogo pin connector for charging the earphone.
|2. ZTE LiveBuds Pro earphones teardown
Enter the teardown part of the earphone and pry open the cavity along the parting line.
A battery unit is arranged inside the back cavity.
Speakers in the front cavity.
Take out the battery unit, the internal structure of the rear cavity, connect the battery wire to the speaker cable, and then connect it to the main board through the hole.
Open the earphone handle, the internal structure of the cavity.
The back of the earphone handle is provided with a bluetooth antenna and a touch detection patch.
The acoustic structure of the noise reduction microphone, and the sound pickup hole is protected by a dust-proof net.
The noise reduction microphone corresponding to the opening is also provided with a rubber acoustic sealing structure to reduce the influence of wind noise and improve the sound reception performance.
The call microphone at the bottom of the earphone is also equipped with a rubber cover.
Remove the earphone tail plug.
Pick up the connector and take out the motherboard and the circuit on the motherboard side.
Circuit on the other side of the motherboard.
Two LED indicators of different colors.
EShine CT8323F one-button touch IC, used to detect the touch operation of the earphone.
LeDiao IA071 2217’s MEMS noise reduction microphone is used for noise reduction function to pick up external environmental noise.
Pogo pin connector used to connect the touch detection patch.
A pogo pin connector for connecting a bluetooth antenna.
BES BES2300 bluetooth audio SoC, BES2300 has multiple versions and different configurations with different suffixes. The BES2300 series is a fully integrated adaptive active noise reduction solution that supports bluetooth 5.0, IBRT bluetooth monitoring technology and dual-mode bluetooth 4.2. It also supports the third-generation FWS full wireless stereo technology, dual microphones, etc., using 28nm HKMG CMOS process, BGA package. BES2300 supports high-performance adaptive active noise reduction technology, which allows high-end active noise reduction headphones to use a fully integrated chip to achieve high sound quality and active noise reduction.
In addition, BES2300 also supports external sensor devices such as heart rate sensors and acceleration sensors. BES2300 can output sound to headphones and home audio, and can also record from an external microphone.
According to 52audio, there are already a large number of true wireless headphones from Samsung, Xiaomi, OPPO, JBL, 1More, Honor, Baidu, OnePlus, Transsion, Realme, Anker and other brands that have adopted the BES solution.
The crystal oscillator that provides the clock for the bluetooth chip.
A metal pillar for charging the earphones is welded on the end of the motherboard.
Laser carving IA071 2217 MEMS microphone is used for voice call pickup.
LPS LP4055QVF linear lithium-ion battery charging IC, using TDFN-6 small-volume package, the charging voltage is fixed at 4.2V, the charging current can be programmed through a resistor, and the maximum current can reach 800mA.
According to 52audio, audio products under well-known brands such as Xiaomi, OPPO, OnePlus, realme, Transsion, MEIZU, Lenovo, Edifier, 1MORE, QCY, Baidu, JBL, Marshall, etc. have adopted a large number of LPS power management solutions.
Three precision winding inductors around the bluetooth chip.
BTB connector used to connect the components inside the headphone head.
In the internal structure of the rear cavity, a dust-proof net is arranged inside the pressure relief hole.
Take out the loudspeaker unit, and an inward microphone is arranged in the lower sound-out tube.
The tuning hole of the sound cavity is protected by a dust-proof net inside.
The components inside the headphone head are connected to the male BTB connector of the motherboard.
The headphone uses a soft-pack button battery, model: SP1254D, voltage: 3.7V, capacity: 55mAh/0.20Wh.
The front of the headphone dynamic driver.
The back of the dynamic driver.
After actual measurement, the speaker size is about 10mm.
Laser carving 12906 2211 MEMS microphone, used for noise reduction function to pick up the internal noise of the ear canal.
The back of the microphone is provided with a metal plate for reinforcement.
The left and right components of ZTE LiveBuds Pro true wireless noise reduction earphones.
ZTE LiveBuds Pro true wireless noise reduction headphones have an oval design in the charging case, which is small and round, light and portable. The earphone adopts a handle-shaped in-ear design. The earphone handle and the headphone head adopt a similar interspersed structure design, and the paragraph is designed with a ring-shaped colorful coating, which has a fashionable look and strong recognition.
In terms of internal circuit, the charging case uses Type-C charging interface input power, built-in battery capacity of 420mAh, equipped with circuit protection board and iCM CM1102B-GD lithium battery protection IC. Using INJOINIC IP5513 TWS headphone charging compartment management SoC, a single chip integrates functions such as 5V boost converter, lithium battery charging management, battery power indicator, etc., only a few peripheral components are required for application, and the overall solution size is effectively reduced. Reduce BOM cost. To
The ZTE LiveBuds Pro earbuds uses a 10mm dynamic driver, a 55mAh button-type soft-pack battery, and three MEMS microphones for calls and active noise reduction. The main control chip is the BES BES2300 bluetooth audio SoC, which integrates an adaptive active noise reduction solution, supports bluetooth 5.0, supports the third-generation FWS full wireless stereo technology, dual microphones, etc. It also uses LP4055QVF linear lithium-ion battery charging IC, EShine CT8323F touch detection IC and so on.
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