MEES A5 true wireless bluetooth earphones teardown

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MEES is the audio brand of Shenzhen MEES Technology Co., Ltd. Founded in 2011, it is a manufacturer specializing in the design, research, development, production and sales of TWS earphones. Its products are mainly sold to overseas markets. I have disassembled MEES T3 true wireless bluetooth earphones and MEES Fit1C true wireless bluetooth earphones.

The MEES A5 true wireless bluetooth earphones to be disassembled today is functionally focused on male and female voice-changing calls and dynamic surround audio. It can be turned on/switched by touch function when making calls and listening to music, which adds to the fun of using the product. Sex.

In terms of configuration, the MEES A5 true wireless bluetooth earphones uses a bluetooth 5.0 main control chip, which supports master-slave switching and single earphones use; the earphones has a battery life of about 6 hours in a fully charged state, and the charging case provides an additional 30 hours of battery life. The earphone adopts a bean-type in-ear design, and each ear weighs about 4.4g, which is relatively small. Let’s take a look at the complete dismantling of 52audio.

| 1. MEES A5 TWS earphones unboxing

The packaging box is in the shape of a small square box with black lettering on a white background and only the brand name “MEES” on the front.

The MEES brand logo is printed on the side of the box, and the product name is “MEES A5 True Wireless Bluetooth Earphones——Black” below.

The contents of the box, earphones and charging case, silicone eartips, charging cable and instruction manual.

The charging cable is a USB-A to USB Type-C interface.

Two pairs of replaceable silicone eartips, the default on the earphones is M size, to adapt to the size of the ear canal of different people.

The surface of the box cover has been treated with a bright surface, the corners have a stepped texture, and the middle of the box cover is the brand name “MEES”.

The side of the charging case is frosted, and there is a groove at the opening of the lid for easy opening.

The body shell can transmit light, and the indicator light is a hidden design.

The USB Type-C charging interface is located on the back of the charging case.

Use the ChargerLAB POWER-Z KM001C portable power tester to test the MEES A5 true wireless bluetooth earphones for wired charging test. The charging power is about 1.3W.

The state of the earphones in the charging case, the left and right earphones are placed symmetrically, and the L/R logo is on the charging cockpit shell.

The position of the headphone indicator light.

Pogo Pin for charging earphones.

The lid is also light-transmissive, and the use of this material can reduce weight.

The earphones and charging case weigh a total of 32.3g.

MEES A5

The charging case alone weighs 23.6g.

MEES A5

The left and right earphones weigh 8.7g in total.

MEES A5

MEES A5 true wireless bluetooth earphones.

| 2. MEES A5 earphones charging case teardown

After unpacking the box, we have a comprehensive understanding of the appearance of the MEES A5 true wireless bluetooth earphones. The earphones and charging case are small in size and light in weight. Next, we will enter the disassembly process to see its internal structure and chip information.

Pry open the charging cockpit to see the internal structure, and there is a physical buckle connection on the side.

Inside the charging cockpit, there is a magnet on each of the left and right earphone sound chambers to magnetically fix the earphones, and a longer bar magnet is used to attract the box cover at the opening of the box cover.

The internal structure of the charging case, the battery is at the bottom.

There is a highly integrated power management chip on the circuit on the motherboard side.

Remove the battery, there are no components on the back of the motherboard.

LPS LP7802A is a six-in-one single-chip solution that supports 1A linear charging, synchronous rectification boost discharge, load identification, control, status indication, and dual-channel independent discharge functions.

LPS LP7802A supports dual-channel independent output of charging status. It is a six-in-one charging bin dedicated chip. The input terminal has a built-in 30V over-voltage protection that meets vehicle-level standards. The standby power consumption is as low as 23uA. It supports Hall switches and can be full of cut-off current. Adjusted to 1mA, the left and right ears can be independently identified and charged independently. The whole warehouse does not require MCU minimalist design. The SSOP16 package saves area, making the design of the TWS charging case time-saving and worry-free.

According to 52audio, audio products from brands such as Xiaomi, OPPO, Huawei, Lenovo, Motorola, Realme, Edifier, QCY, JLab, Skullcandy, Boltune and other brands have adopted a large number of LPS power management chips.

The soft pack battery used in the charging case comes from ST (Shenzhen Shentong Tianxia Technology Co., Ltd.), model ST602030, with a rated voltage of 3.7V, a rated capacity of 300mAh, and an energy of 1.11Wh.

The battery protection board is responsible for the overcharge, overdischarge and overcurrent protection of the battery.

Gold-plated Pogo Pin for charging earphones.

A two-color LED indicator.

| 3. MEES A5 earphones teardown

Let’s continue to disassemble the earphone part. The MEES A5 true wireless bluetooth earphone adopts a bean-type in-ear design, which is small in size and light in weight.

The touch area has a brushed texture, and the earphones supports single, double, and three-touch, and long-press control modes. The long-press control also sets an audio reminder.

The microphone pickup hole is also an indicator light hole, which is designed to be more concealed.

There are two charging contacts on the inside of the earphones, as well as the L/R logo.

The fine dust-proof net of the sound mouth and the metal net cover on the outside provide double protection to prevent foreign matter from entering.

Disassemble the earphone along the parting line, you can see the internal structure.

Inside the earphone shell, the outer ring is a bluetooth antenna, the middle is a touch-sensitive foil, the microphone protective cover and the light guide of the indicator light are combined into one.

The internal structure of the left and right earphones is basically similar, and the product name “A5” is affixed to the main control chip.

The internal structure of the earphone is designed to be stacked layer by layer.

The speaker unit, soft pack battery, and main board are arranged in order from the inside to the outside, from low to high. The Pogo Pin on the main board can be connected at the same time, which greatly improves the efficiency of assembly and production.

The internal structure of the front cavity.

A conductive sponge is attached to one side of the speaker unit for better contact.

The dynamic speaker unit size is about 9mm.

The size comparison of soft pack battery and RMB coin.

The soft pack battery in the earphone is also from ST, model ST501015, with a rated voltage of 3.7V and an energy of 0.19Wh. The positive and negative contacts are also covered with conductive sponges.

The size comparison of the earphones motherboard and RMB coin.

Circuit on the motherboard side.

Circuit on the other side of the motherboard.

The main control chip model of MEES A5 true wireless bluetooth earphones is TWS100, which is a smart audio SOC that supports bluetooth V5.0 launched by SmartLink (Zhuhai SmartLink Technology Co., Ltd.), which is mainly used in bluetooth wireless audio and smart voice product. It integrates two high-performance RISC processors, bluetooth dual-mode radio frequency modules, high-performance audio ADC/DAC, advanced power management unit, lithium battery charging module, embedded flash memory, and flexible peripheral interfaces.

TWS100 is a high-performance solution for TWS products, combined with SmartLink’s 3D sound effects and AI voice-changing algorithm, to provide customers with a better music experience and entertainment experience.

Screen printing 2610 touch IC.

Screen printing 0mA3 battery protection IC.

A MEMS silicon microphone is used for call pickup.

An LED indicator.

Cylindrical Pogo Pin for powering earphones.

Two sets of thimble-type Pogo Pins, one high and one low, are respectively connected to the speaker unit and the battery.

Connect the bluetooth antenna and the thimble-type Pogo Pin of the touch foil respectively.

All components of MEES A5 true wireless bluetooth earphones.

Summary:

The charging case of the MEES A5 true wireless bluetooth earphones adopts a light-transmitting shell, which can reduce weight. The indicator light is designed to hide; the box cover is treated with a bright surface, and the corner transition has a stepped texture; the earphones adopts a bean-shaped in-ear shape, touch control The area has a brushed texture, and the microphone pickup hole is also an indicator light hole, which is designed to be more concealed. The detail treatment reflects the brand’s degree of care for the product.

In terms of internal circuits, the charging case inputs power through the USB Type-C interface. The circuit integration is high. LPS LP7802A supports 1A linear charging, synchronous rectification boost discharge, load identification, control, status indication, dual-channel independent discharge functions, etc. MCU minimalist design; the soft pack battery comes from ST with a capacity of 300mAh.

The MEES A5 true wireless bluetooth earphones has a highly modular internal design. The speaker unit, soft-pack battery, and motherboard are arranged from the inside to the outside, from low to high. The Pogo Pin on the motherboard can be connected at the same time, which greatly improves the assembly and production. effectiveness.

MEES A5 true wireless bluetooth earphones features male and female voice-changing calls and dynamic surround audio functions, derived from the TWS100 smart audio SOC launched by SmartLink, with high integration and simplified peripheral circuits. It can also be applied to other bluetooth wireless audio and smart voice products; Using the capacitive touch solution, the soft pack battery also comes from ST, with an energy of 0.19Wh.

Source: 52audio

 


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