QCY is committed to creating technological and innovative smart electronic devices for the new generation of young people. In 2021, QCY ushered in a brand strategy upgrade, designed a brand new LOGO, and created an elephant that loves music and rhythm as its brand image inspired by chips.
QCY T17 true wireless earbuds is a bean-shaped product designed for small ears recently launched. It has a small, lightweight, beautiful appearance design, and provides a comfortable and stable wearing effect. In terms of functional configuration, a new generation of bluetooth technology has brought better transmission and connection performance. It supports low-latency mode and ENC call noise reduction, with a single 7.5 hours, combined with a battery life of 26 hours.
52audio also teardown QCY’s products before: QCY T11, QCY T10, QCY T13, QCY T1C, QCY T1 Lite, QCY T1S (wireless charging version), QCY T4 TWS, QCY T5 , QCY Q5S, QCY T29 and other true wireless headphones. Let’s take a look at the detailed dismantling report of this product.
|1. QCY T17 charging case teardown
After unpacking, we learned about the compact and lightweight design of QCY T17 true wireless earphones. Let’s enter the teardown section to see the internal structure configuration.
The charging case is also fixed between the cockpit and the shell by a buckle structure, and the cockpit can be easily taken out by prying off the buckle.
The internal structure of the charging case.
The Type-C charging interface position is designed with bone support to increase strength.
Indicator light guide.
The main board is fixed by screws at the bottom of the charging case cockpit.
Remove the main board, the bottom structure of the cockpit, and the three square magnets are used to adsorb the charging case cover and earphones.
The main components in the charging case.
The charging case built-in lithium-ion soft pack battery model: 901826PN2, rated voltage: 3.7V, rated capacity: 380mAh/1.406Wh, from VDL.
The charging case front circuit of the motherboard.
The circuit on the back of the motherboard.
The Type-C charging interface female seat adopts sinking plate welding to reduce the thickness of the motherboard.
Pogo pin connector for charging the earphones.
Two LED indicators of different colors.
Winsemi WSDY06 series lithium battery protection chip is a highly integrated solution for the protection of single-cell lithium-ion/lithium polymer rechargeable battery packs. It has the protection functions required by all batteries, such as overcharge, overdischarge, overcurrent, and short circuit.
It is understood that for TWS smart wear, Winsemi provides a complete set of protection solutions, including a small-size DFN1x1 packaged lithium battery protection chip and OVP/OCP protection solution.
According to 52audio, there are already Winsemi lithium battery protection chips used in TWS headset products of Honor, UGreen, Edifier, FIIL, MEIZU, Transsion, BULL and other brands.
TPS SY8812 is a SoC chip specially designed for the charging compartment of bluetooth headsets, in a 3mmx3mm QFN16 package. A charging module and a discharging module are integrated inside the chip. The charging current can be adjusted externally. The discharge module integrates two output current limit switches, provides independent load presence detection and load insertion detection, and supports output current detection. The chip integrates NTC protection function, which can charge and discharge the battery more safely.
TPS SY8812 optimizes the performance of product application design reliability, the input withstand voltage is as high as DC30V, and the chip has passed the IEC62368 safety certification. SY8812 is very suitable for the design of the bluetooth headset charging compartment, which greatly simplifies the peripheral circuits and components, and provides a simple and easy-to-use solution for the application of the bluetooth headset charging compartment.
According to 52audio, the TPS power management chip has been adopted by many well-known brands such as Soundcore, F&D, UGREEN, OPPO, Xiaomi, Baidu, 1MORE, 233621, Transsion, Sabbat, Creative, and OnePlus.
The NTC thermistor that detects the temperature of the battery detects the temperature of the battery and is detected by Siyuan SY8812 to ensure that the battery is charged and discharged within the normal temperature range.
|2. QCY T17 earbuds teardown
Enter the teardown part of the earphone, unlock the shell buckle, and remove the back cover.
The inner structure of the cover is provided with a bluetooth antenna and a touch detection patch at the bottom. On the upper left is the acoustic structure of the microphone, which is used to improve the radio performance. The bottom right is the indicator light guide.
The main board is positioned and fixed on the front cavity through a plastic column.
Take out the motherboard and battery, the internal structure of the cavity.
Take out the speaker, the internal structure of the front cavity, and the magnet is fixed in the card slot by glue. The inside of the tuning hole is protected by a dust-proof net.
The headset uses a lithium-ion soft pack battery, model: 541112, rated capacity: 0.16Wh.
On the back of the earphone speaker, the wire is soldered on the PCB board.
The front of the speaker uses a composite diaphragm dynamic driver.
After actual measurement, the speaker size is about 6.25mm.
The front circuit of the headset motherboard.
The circuit on the back of the headset motherboard.
JL AD6973D4 bluetooth audio SoC, support bluetooth 5.3, built-in 32-bit DSP, support AAC, SBC decoding, support neural network noise suppression and echo cancellation, support multi-band equalizer. Support single/dual microphone noise reduction, support two-way analog microphone amplification, built-in microphone bias. Adopt QFN20-3*3 package.
According to 52audio, the bluetooth audio products of F&D, Tezo, Philips, Motorola, Amazon, boAt, Lenovo, MAOKING, Xiaomi, Baseus, SOAIY, MEES and other brands have adopted the JL solution. JL also released the AC700N series of TWS solutions this year.
Scientic SDHL1608F100MT fully magnetically shielded precision winding inductor, with the built-in step-down circuit of the bluetooth chip to supply power to the bluetooth main control chip.
SDHL series precision wire wound inductors adopt a fully magnetic shielding structure, which reduces radiation and interference to the surroundings, and can optimize the noise and pop sound of TWS earphones. The copper wire is wrapped. Under special circumstances, when inductive howling occurs, the wrapping layer can suppress the vibration of the copper wire, thereby optimizing the inductive howling phenomenon.
The shielding layer of SDHL series precision wire-wound inductors is made of materials with enhanced magnetic permeability, which enhances the performance of the inductor, and at the same time tightens the magnetic line of force, so that the bottom of the inductor can be routed. The bottom copper wire is not exposed, which can avoid high-temperature solder paste sputtering during the production process, thereby improving the quality control of mass products.
Earlier, 52audio has introduced to you in detail which inductors are used in TWS headphones, what are their functions, how to choose suitable inductors for TWS headphones, and the three models and dozens of high-quality inductor products launched by Scientific Electronics in response to the TWS headset market.
The 24.000MHz crystal oscillator provides the clock for the bluetooth chip.
The MEMS microphone of LaserDiao 1054 3071 is used for voice call pickup.
The microphone opening on the motherboard is covered by a dust-proof net to prevent foreign objects from entering.
The metal copper post connector for charging the earphones on the motherboard.
Metal shrapnel connector on the motherboard.
The headset uses the Winsemi WSDF13D2N2H lithium battery protection chip to protect the single-cell rechargeable lithium battery from damage due to overcharge voltage, overdischarge voltage, charge overcurrent, discharge overcurrent, and short circuit.
The peripheral circuit of the WSDF13D2N2H system is simple. The MOSFET is built-in, and the typical equivalent resistance is 52mΩ. It adopts a very small DFN1x1-4 package, which is suitable for space-constrained lithium battery applications.
Two LED indicators of different colors are used to feed back the power of the headset and the bluetooth pairing status.
All components of QCY T17 true wireless bluetooth earbuds.
QCY T17 true wireless bluetooth earbuds adopts a new design in appearance. The charging case is small and slender, making it easier to carry. The earphone adopts a round bean-shaped in-ear design and is equipped with earwings structure to improve the stability of wearing. The earphones have been treated with a bright surface process to enhance the sophistication of the product. With the QCY brand LOGO, it has a high degree of recognition.
In terms of the internal structure, the charging case has a built-in VDL 380mAh lithium battery, and the Winsemi WSDY06 series lithium battery protection chip provides all the protection functions required by the battery such as overcharge, overdischarge, overcurrent, and short circuit. Using Type-C interface input power, the built-in battery is charged by the TPS SY8812 charging compartment SoC, and a boost module is integrated to charge the internal battery of the headset. The chip also integrates NTC protection function to charge and discharge the battery more safely.
The QCY T17 earphones uses a 6.25mm composite diaphragm dynamic driver and a 0.16Wh soft pack battery, which is connected to the motherboard through wires. On the motherboard, a lithium battery protection chip with Winsemi WSDF13D2N2H is provided to protect the built-in battery from charging and discharging. The main control chip is JL AD6973D4 bluetooth audio SoC, built-in 32-bit DSP, and supports single/dual microphone noise reduction. The peripheral is equipped with a Scientific SDHL1608F100MT fully magnetic shielded precision winding inductor for power supply, which greatly reduces interference compared with ordinary winding inductors.
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