TWS headset has developed so far and has derived categories such as sports, focused sound quality, sleep, etc. The requirements of users can often lead to the birth of a new category of products. The portability of TWS headphones has been sought after by consumers since its inception, but when users use TWS earphones in games, they find a problem. The excessive delay of the headphone leads to the problem of poor gaming experience.
Lenovo is concerned about the problem of excessive delay when users use TWS headphones to play games, and launched Lenovo LP6 gaming earphones to optimize the user’s gaming experience. Lenovo LP6 has built-in “AAC HD decoding video mode/AGC precise control game mode“. In terms of internal configuration, earphones use a 13mm biological diaphragm with three-band equalization to support automatic equalization adjustment. In terms of battery life, Lenovo LP6 earphones can achieve up to 30 hours of battery life with the charging case. In terms of charging, earphones support fast charging for 10 minutes of charging and 60 minutes of battery life.
52audio recently got the Lenovo LP6 and teardown it to study how it can achieve a cost-effective low-latency game mode and fast charging. Interested friends, let’s take a look.
Previously, 52audio has teardown Lenovo HT38, Lenovo thinkplus Liveods LP40, Lenovo QT83, Lenovo TC03, Lenovo ThinkPlus TrackPods, Lenovo TWS S1, Motorola Verve Ones+, Motorola Verve Buds 200, Motorola Verve Buds 500, Motorola Verve Buds 800 and other true wireless headphones. Let’s take a look at the disassembly report of this product below.
01/ Lenovo LP6 charging case teardown
After reading the cool appearance of Lenovo LP6 earphones, let us enter the teardown part of the product. First perform teardown of the charging case.
First, pry open the earphone cockpit along the parting line, and separate the charging cockpit from the charging case shell.
The front of the charging cockpit is equipped with a Hall element that senses the opening and closing of the charging case.
There is a charging case battery on the back of the charging cockpit.
The charging cockpit has counterweights on both sides.
The mainboard of the charging case is located at the bottom of the charging cockpit.
The mainboard of the charging case is fixed on the charging cockpit by screws.
Remove the screws and separate the charging case motherboard from the charging pod.
The structure of the charging cockpit after the charging case motherboard is removed, there are 3 magnets for attaching the earphones and the charging case cover.
charging case motherboard circuit.
The front circuit of the charging case motherboard.
The circuit on the back of the charging case motherboard.
charging case battery, model SQX701435, rated voltage 3.7V, rated capacity 1.11Wh.
Uncover the insulating tape of the battery, you can see that the battery is equipped with a circuit protection board, and the circuit protection board has ICs and MOS tubes to protect the circuit.
Silkscreen 1KAn Hall element, by sensing the magnetic field change (Hall effect) when the charging case cover is opened/closed, it notifies the charging case control chip, and then informs the earphones to connect/disconnect from the paired device, realizing open the box and pair devices automatically function.
ZIF connector for connecting Hall element FPC cable.
Pogo pin connector for charging earphones.
Type-C female seat.
Injoinic integrated MCU TWS charging case management SoC model IP5518. A multi-function power management SoC integrating 5V boost converter, lithium battery charging management, and battery level indication provides a complete power solution for TWS charging case.
The high integration and rich functions of IP5518 make it only need very few peripheral devices in application, and effectively reduce the size of the overall solution and reduce the cost of BOM. The IP5518 chip has a built-in 5V output, synchronous rectification boost DC-DC, built-in power tube, providing a maximum output current of 300mA, and boosting efficiency as high as 93%. The DC-DC converter switches at 1.5MHz and can support low-cost inductors and capacitors.
The linear charging of IP5518 provides a maximum charging current of 500mA, and the maximum charging current can be flexibly configured. The built-in IC temperature and input voltage intelligently adjust the charging current function. The IP5518 can realize the independent storage detection of earphone by TWS, and automatically enter the earphone charging mode after detecting that the earphone is in the storage. After the earphone is fully charged, it automatically enters the sleep state, and the quiescent current can be reduced to a minimum of 20uA. The earphones can be flexibly customized to judge the full current, and the full current detection accuracy is as high as 1mA.
According to 52audio, a large number of TWS charging cases of Edifier, ZTE, JLab, HiBy, Baseus, Pioneer, PIHEN, BULL, AUKEY, MPOW, BoAt, Nokia, Lenovo, AMOI and other brands have adopted the Injoinic power management solution.
2R2 boost inductor, with the power management chip boost to charge the earphone.
02/ Lenovo LP6 earphones teardown
After teardown charging case, let’s disassemble earphones to see what secrets are inside.
First remove the headphone shell along the parting line.
There is a dynamic driver inside the earphone shell.
The soft pack battery and magnet are designed in the back cavity of the earphone head.
Take out the battery in the back cavity of the headphone head, the dynamic driver and the soft pack battery are connected to the earphone motherboard on the headphone handle through the opening of the back cavity of the headphone head through the wire.
Tuning hole in the back cavity of the earphone head.
Headphone battery information, model SQX451012, rated voltage 3.7V, rated capacity 35mAh/0.1296Wh.
Remove the dynamic driver from the headphone head shell, and use a lot of glue to fix the dynamic driver in the headphone head shell.
The front of the dynamic driver is protected by a metal protective case.
On the back of the dynamic driver, there are tuning holes to improve the acoustic performance.
After actual measurement, the size of Lenovo LP6 earphones dynamic driver is about 13.14mm.
Then let’s take a look at earphone’s motherboard. First remove the case at the bottom of the headphone stem, then pry open the back cover of the headphone stem.
The back cover of the earphone handle is positioned and assembled together through the column hole, and the top of the back cover of the earphone handle is also provided with touch-sensitive copper foil.
The back of the earphone motherboard.
Remove the earphones motherboard from the headphone stem.
The wires of the dynamic driver and the battery are connected to the earphone motherboard by soldering.
Separate the wires of the dynamic driver and the battery from the earphone mainboard, on the front of the earphone mainboard circuit.
The circuit on the back of the earphone motherboard.
The touch IC of silk screen 33C 2039 is used to realize the touch control function of the earphone.
An unmarked inductor.
Connect the pogo pin connector of the capacitive touch detection patch.
2 LED lights for indicating earphone working status.
earphone ceramic bluetooth antenna for wireless signal transmission.
The MEMS microphone of the laser engraving 2113 FX62 is used to provide the earphone with the pickup function of voice calls.
Metal charging post for charging earphones.
The 24.000MHZ crystal oscillator provides the clock for the bluetooth chip.
The main control chip in earphone adopts Actions ATS3015 bluetooth audio SoC, which has the characteristics of high performance, low power consumption and low cost. The kernel adopts RISC32 reduced instruction set structure, built-in large-capacity storage space to meet different bluetooth applications. Support Bluetooth 5.3 dual-mode, support bluetooth audio playback, load sound effects at the same time, support bluetooth hands-free calling, echo cancellation and noise reduction algorithms.
According to 52audio, there are already Baseus, Motorola, HYMALAYA, FUNCL, BULL, UGreen, RODE and other brand products that have adopted the Actions bluetooth audio master chip in large numbers.
All components of Lenovo Live Pods LP6 true wireless bluetooth earphones.
The Lenovo LP6 charging case adopts a long box design with a raised lid in appearance. Two V-shaped arrow indicator holes are designed in the center of the charging case, which is very cool. The appearance of Lenovo LP6 earbuds continues the angular handle in-ear design of the charging case. The appearance material is the same matte black material as the charging case, and the back of the earphone is also equipped with 2 arrow light openings.
In the internal configuration of the charging case, there is a Hall element to realize the “connection of the earphones when the cover is opened, and disconnection when the cover is closed”. The rated capacity of the charging case battery is 1.11Wh, and with earphones, it can achieve up to 30 hours of battery life. In terms of power management, Lenovo LP6 earbuds use the TWS charging case management SoC with Injoinic IP5518 integrated MCU, which provides a maximum charging current of 500mA, and can flexibly configure the maximum charging current.
IP5518 built-in IC temperature and input voltage intelligently adjust the charging current function. The IP5518 can realize the independent storage detection of earphones by TWS, and automatically enter the earphone charging mode after detecting that the earphone is in the storage. After the earphone is fully charged, it automatically enters the sleep state, and the quiescent current can be reduced to a minimum of 20uA. The earphones can be flexibly customized to judge the full current, and the full current detection accuracy is as high as 1mA. In this way, earphones can be quickly turned on after 10 minutes of charging.
On the internal structure of the earphones, there are 2 tuning holes to ensure the quality of the sound output by the earphones. In order to achieve low latency in game mode, the main control chip of earphones adopts Actions ATS3015 bluetooth audio SoC, which has the characteristics of high performance, low power consumption and low cost. Support Bluetooth 5.3 dual-mode, support bluetooth audio playback, load sound effects at the same time, support bluetooth hands-free calling, echo cancellation and noise reduction algorithms.