LOOP-T6 is a 2-in-1 product with a power bank and a true wireless headset. The appearance design is unique, and the charging case uses a high-density aluminum alloy shell, which makes it feel smooth and delicate. The earphone is a semi-in-ear design, and the earphone handle is painted with metal to provide a metal texture similar to the charging case. The earphone uses a 30° ergonomic ear angle to provide a comfortable wearing experience.
The LOOP-T6 charging case is not only the earphone charging compartment that can charge the earphones, but also a power bank that can charge other devices. The charging case adopts a hidden cabin structure design. Double-click the touch area to automatically pop up, and double-click again to rebound and hide. The charging case is equipped with independent power indicator lights for the two earphones and the charging case, so that the user can learn the remaining power status.
The headset supports bluetooth V5.0, supports AAC audio decoding, and supports binaural high-definition calls. The built-in 60mAh battery provides a battery life of about 5 hours per time. It supports IPX6 waterproof, can be washed and cleaned, without fear of sweat and rain. Let’s take a look at the design and internal structure of this product in detail.
|1. LOOP-T6 charging case teardown
Through unpacking, we learned the unique design of the two-in-one power bank and headset of the LOOP-T6 smart headset. Let’s enter the dismantling part below to take a look at the internal structure configuration.
Remove the snap-fit ​​fixing cover from the top of the charging case.
The metal patch on the inside of the cover is used for touch control of the pod.
Remove the metal casing.
The front structure of the internal cavity of the charging case.
Open the cavity and take out the internal hanging cabin structure. A cylindrical lithium ion battery is set in the cavity.
The inner structure of the cavity, the key position is the rack lifting structure of the nacelle.
Hanging compartment and battery unit.
Cylindrical 18650 lithium battery, wrapped in blue plastic skin.
An insulating barley paper is arranged at one end of the battery.
The other section is also protected by insulating barley paper.
Remove the plastic cover, there is no silk screen information on the internal battery.
The micro switch for detecting the position of the hanging cabin is fixed on the shell through a small plate.
Open the pod, the internal structure.
A small motor with a reduction gear is installed at the bottom of the pod, which is used for lifting and lowering the pod. Wires and sockets are used to connect to the main board.
Hanging cabin lifting motor.
The inner structure of the earphone cockpit is provided with two magnets for attracting earphones. The charging board is connected with the main board through the contacts.
Inside structure of the headset cockpit.
The PCB board for charging/communication of the earphone has three pogo pin connectors on the top.
It is used to fix the buckle structure when the pod is raised and lowered.
Two micro switches are used to detect the position of the pod in conjunction with the slide rail structure on the pod.
The circuit on the side of the charging case indicator board is provided with a ZIF connector and a touch detection IC.
Another test circuit of the indicator light board is provided with 14 indicator lights on the edge, and two metal dome connectors connected to the touch patch in the middle.
The touch detection IC of the silk screen 8233LK.
The charging case front circuit of the motherboard.
The charging case circuit on the back of the motherboard.
The end of the motherboard is welded with a Type-C female socket for power input and a USB-A female socket for power output.
The INJOINIC IP5333 chip is a multifunctional power management SOC with integrated boost converter, lithium battery charging management, battery power indicator and TYPE-C protocol, providing a complete solution for TWS charging bays. The high integration and rich functions of IP5333 enable it to require very few peripheral components in application, and effectively reduce the size of the overall solution and reduce the BOM cost.
IP5333 only needs one inductor to realize charging and boosting functions. Can support low-cost inductors and capacitors. The IP5333 synchronous boost system provides a rated output current of 1A, and the conversion efficiency is as high as 92%. When the load is light, it will automatically enter the dormant state, and the quiescent current will drop to less than 20uA. IP5333 uses switching charging technology to provide a rated charging current of 1A, with a charging efficiency as high as 91%. The built-in IC temperature protection and input voltage intelligently adjust the charging current. IP5333 built-in 12bitADC, can accurately measure battery voltage and current. Support 1/2/3/4 LED power display.
According to 52audio, there are already a large number of TWS headset 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 inductance of the silk screen 1R0 is matched with IP5333 to realize switch charging and synchronous boost.
TC118S motor driver is used to drive the deceleration motor forward and reverse.
A non-standard single-chip microcomputer chip detects the touch operation and outputs control signals.
The integrated lithium battery protection IC of silk screen R3028.
The metal dome used to connect the charging board on the main board.
ZIF connector used to connect the indicator light board.
Socket used to connect the motor.
|2. LOOP-T6 smart earphones teardown
Enter the headphone teardown part and pry open the headphone along the mold line.
Then pry off the back cover of the earphone.
In the internal structure of the cavity, there is also a layer of bracket inside, on which the touch FPC cable and the bluetooth antenna are fixed.
Uncover the cable and antenna patch to expose the bracket.
Remove the internal bracket of the earphone and the internal structure of the cavity.
The bluetooth antenna is connected to the headset main board through metal contacts, and a microphone acoustic sealing structure is also provided on the bracket to improve the radio performance.
Take out the motherboard and battery inside the headphone handle.
The earphone speaker wire and the cable are soldered on the motherboard.
The internal structure of the earphone handle cavity is provided with a black shielding sticker in the middle, and the earphone magnet is used to absorb the cockpit underneath.
Three pogo pin connectors for charging/communication of the headset.
The internal structure of the back cavity of the earphone, the opening of the wire on the other side of the shell is sealed with glue.
Take out the loudspeaker, the internal structure of the front cavity, and the tuning hole is covered with a dust-proof net to prevent foreign matter from entering the sound cavity.
The front diaphragm of the dynamic speaker inside the earphone.
On the back of the speaker, the word KWT is engraved in the middle, and there are tuning holes around it, protected by a dust-proof net.
After actual measurement, the speaker size is about 14mm.
The internal motherboard and battery unit of the headset.
Conductive cloth is arranged on the FPC cable for touch control.
On the other side, there is a touch detection IC with silk-screen 3308, and two LED indicators of different colors.
Circuit on the motherboard side.
Circuit on the other side of the motherboard.
Laser carving G464 0B54 MEMS microphone is used for voice call pickup.
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.
The crystal oscillator that provides the clock for the bluetooth chip.
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.
Metal dome used to connect the bluetooth antenna.
The headset has a built-in lithium-ion soft pack battery model XYT601015, rated capacity: 60mAh/0.222Wh, rated voltage: 3.7V.
The battery is equipped with a circuit protection board, which is equipped with DW01 lithium battery protection IC and 8205 MOS tube.
All components of the LOOP-T6 2-in-1 smart earphones.
|3. Summary
The LOOP-T6 two-in-one smart headset has a unique charging case design. At first glance, everyone should think it is a power bank. Then by touching the switch, the hidden pod structure automatically rises, giving people a sense of surprise. In terms of earphones, the headphone head is compact and comfortable to wear. The volume of the earphone handle is relatively large, but the metal-like craftsmanship and the smooth lines of the indicator window also have certain characteristics.
In terms of internal structure design, the charging case is relatively complicated. The cabin is designed with a sliding rail structure and a fixed structure, which are driven by a small motor. The internal components are connected through sockets and ZIF connectors. There are 14 indicator lights and touch switches on the small indicator light board on the top of the charging case. The motherboard adopts INJOINIC IP5333 power management SOC, which integrates functions such as boost converter, lithium battery charging management, battery power indicator and TYPE-C protocol, and provides support for various functional applications of charging case.
The LOOP-T6 earphones uses a 14mm dynamic driver and a 60mAh lithium battery. The main control chip is JL AD6973D4 bluetooth audio SoC, built-in 32-bit DSP, supports AAC decoding, supports neural network noise suppression and echo cancellation, supports single/dual microphone noise reduction, and matches with MEMS microphones to improve the clarity of voice calls.
Source: 52audio