MEIZU POP2s true wireless bluetooth earbuds teardown

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On October 20, 2020, Meizu Technology released its new true wireless earbuds Meizu POP2s, which continued Meizu’s 17 years of profound experience in the acoustic field. Its appearance follows the spiral curve design of the previous generation product Meizu POP/Meizu POP 2 true wireless bluetooth earbuds, and the audio design and hardware configuration are fully upgraded.

Meizu POP2s true wireless earphones use a new double-layer structure composite diaphragm, combined with a new audio design resolution has been greatly improved. POP2s is Meizu’s first product that supports “Flyme wonderful connect”. It can be quickly connected to the mobile phone by opening the charging case, with a pop-up display; built-in bluetooth 5.0 low-latency chip, the earbuds supports call noise reduction, touch control, wake up voice assistant and other functions , Battery life data is 6h+24h, IPX5 waterproof and sweatproof. Let’s take a look at the upgrades of its materials and structural design through disassembly.

Previously, 52audio disassembled many Meizu audio products: Meizu HD60 earbuds noise reduction bluetooth earbuds, Meizu HD60 earbuds bluetooth earbuds, Meizu Gravity suspension audio, Meizu HALO laser bluetooth earbuds, Meizu EP63NC neck-mounted noise reduction earbuds, Meizu HiFi decoding Headphone amplifier, Meizu HiFi decoding headphone amplifier PRO, Meizu bluetooth speaker A20.

| 1. Meizu POP2s true wireless earbuds unboxing

The box is designed with upper and lower lids, the style is the same as that of the previous generation, and it is relatively simple, but without the blue decoration that is the iconic Meizu. The upper left corner is the brand name of Meizu, the middle area is the rendering of the earbuds and charging case, and the product name “Meizu POP2s true wireless earbuds” at the bottom.

There are four product features on the back of the box: binaural dual transmission, master-slave switching; open the cover and connect without feeling pairing; IPX5 waterproof, all sports are available; the earbuds with charging case can last up to 24 hours.

The bottom of the box is the company information and some product certification information, Zhuhai Meizu Technology Co., Ltd.

The product label at the top, Meizu POP2s true wireless earbuds, white.

The contents of the box, Meizu POP2s earphones and charging case, additional silicone eartips and user manual.

Two pairs of silicone eartips are included, which are convenient for people with different ear canal sizes. The earphones come with a medium size.

The charging case is displayed on the front. The appearance is the same as that of the previous generation. The top and bottom are flat and can be placed on the desktop. There are grooves, battery indicator and Meizu brand name at the front opening.

On the back of the charging case, the box cover is connected to the body through a metal hinge, and there is a quick pairing button below.

The USB Type-C charging port is still on the bottom side of the charging case, with some product information next to it. Meizu POP 2s true wireless earbuds, earbuds battery rated capacity 3.7V/55mAh, 0.222Wh×2, input 5V⎓55mA. Charging case battery rated capacity 3.7V/350mAh, 1.295Wh, input 5V⎓350mA.

52audio used the ChargerLAB POWER-Z KM001C portable power tester to perform a wired charging test on Meizu POP2s true wireless earbuds, and the charging power was about 1.6W.

The state of the earbuds in the charging case.

Two golden Pogo Pins for charging earbuds.

MEIZU Meizu POP2s true wireless bluetooth earbuds.

The earbuds and charging case weigh 46.9g in total.

The charging case unit weighs 36.7g.

The left and right earphones weigh 10.3g.

| 2.Meizu POP2s charging case teardown

After unpacking the box, we have got a preliminary impression of the appearance of the Meizu POP2s true wireless earbuds. Compared with the previous generation, it has not changed much. Let’s take a look at its internal structure and power management system through disassembly.

Pry open the charging cockpit to see the internal structure.

The PCBA where the charging interface at the bottom of the charging case is located is connected to the motherboard through a wire.

The inside structure of the metal hinge is displayed.

The internal structure of the charging case is displayed on the front.

The internal structure of the charging case is shown on the back.

The main PCBA of the charging case is fixed on the housing with four screws, and there is a thick foam between the main board and the battery.

Remove the main board and display the inside of the charging cockpit. The four openings are the light guide structure of the indicator light. The round magnets on the upper left and upper right are used to adsorb the cover, and the four magnets in the earphone position are used to adsorb and fix the earphone.

The PCBA where the Type-C charging interface is located.

The other side of the PCBA is displayed and connected to the motherboard through wires.

The charging input wire is connected to the main board through a connector.

The main PCBA circuit of the charging case is displayed, mainly the power management system. The lower right corner is the solder joint of the battery wire. The solder joint is full. The interface of the charging box has TVS for electrostatic protection.

The charging case shows the circuit on the other side of the main PCBA, with MCU related circuits.

The SY8801 chip designed by TPS specifically for the TWS earbuds charging compartment is designed to ensure safe and highly reliable performance (support 28V input withstand voltage, built-in full-featured charging and discharging overvoltage, overcurrent, overtemperature, short circuit protection and other functions) , It also integrates I2C communication function and internal communication isolation function. Through the I2C interface, the MCU of the system can read and configure the internal functions of the power supply and the parameters of battery charging and discharging management, and easily realize such as NTC protection, segmented adjustment of battery current, TWS earphone storage, storage detection, and automatic power output. And other functions.

The internal communication isolation module integrated by TPS SY8801 greatly optimizes the functional design of the smart TWS charging compartment. No complicated peripheral circuits are required. The MCU can be connected to control the SY8801. Not only can it realize the function of charging the earphones, but also the data communication transmission can be carried out through the power source POGO PIN connected with the earphones, which includes functions such as uploading the power of the charging compartment, clearing the pairing of the earphones in the charging compartment, restoring factory settings, and upgrading the earphone software.

According to 52audio, the TPS earbuds charging case power management chip of TPS has been adopted by many well-known brands such as OPPO, Xiaomi, Baidu, 1MORE, 233621, and OnePlus.

Nuvoton N76E003AQ20 8051 core single-chip microcomputer, QFN-20 package, used for charging case control.

According to 52audio, OPPO Enco W51 true wireless noise reduction earbuds, vivo TWS Neo true wireless bluetooth earbuds, vivo TWS Earphone true wireless bluetooth earbuds also use Nuvoton’s microcontroller.

Battery information, model 552035, rated voltage 3.7V, rated capacity 350mAh.

A close-up of the battery protection board, an integrated IC provides battery protection.

Pogo Pin for charging earphones.

Silk screen 4002 9pAG Hall element. The magnetic field changes when the charging box cover is opened and closed will be sensed by the Hall element, and the charging box MCU and earphones will be notified to pair or disconnect with the connected device.

Four LED indicators are used to display power and charging box status.

The jog button is welded on the motherboard.

| 3. Meizu POP2s earphone teardown

Let’s continue to disassemble the earphone part. The appearance of Meizu POP2s true wireless earphones continues the classic design of the POP series. The earphone shell follows the golden ratio, and the spiral design fits the auricle better, enhancing the stability and comfort of wearing.

The earphone shell supports touch control and has the Meizu brand name on it. The outer ring is still the iconic halo design of the Meizu POP series. This time the white halo is used instead of blue. The official promotion is more consistent with the white indicator light of the charging box.

The light guide rod and the call microphone opening on one side of the shell.

The contact point for charging the earbuds battery has the product name “MEIZU POP2s” printed nearby.

A metal dust-proof net is used at the sound hole of the earphone to prevent foreign objects from entering.

Disassemble the earphone shell along the mold line to see the internal structure.

The inside of the earphone shell is displayed, and the metal foil in the middle is used to sense touch operations; the transparent material of the outer ring can transmit light to form an aperture effect.

The internal structure of the left and right earphones is basically the same.

There is a white bracket inside the earbuds to fix the motherboard and battery.

FPC is welded on the main board on one side of the shell.

The nickel plates of the positive and negative electrodes of the battery are welded to the main board.

Open the solder joints and remove the motherboard.

The size comparison of the motherboard circuit and a coin.

The circuit is shown on one side, and the connector holder connecting the charging contact FPC to the motherboard is on the bottom.

The circuit on the other side shows the bluetooth master chip under the QR code label.

The main control chip of Meizu POP2s true wireless earbuds is BES WT230-U. WindTunnel is a bluetooth chip brand under BES.

WT230-U is a highly integrated SoC with bluetooth 5.0 dual-mode and high-performance Cortex-M4F, suitable for audio and voice applications; WT230-U uses a highly integrated RF transceiver, high-performance audio codec and coverless earbuds The driver minimizes the cost of external components and BOM.

WT230-U is manufactured using advanced low-power CMOS process and is packaged in a 4 * 6mm 40-pin QFN package; bluetooth version 5.0, power consumption 8mA. WT230M/S/U, corresponding to WT200M/S/U respectively, can support mono/stereo/TWS bluetooth earbuds solutions.

According to 52audio, a large number of true wireless earbuds from brands such as Huawei, Samsung, Xiaomi, OPPO, JBL, 1MORE, Honor, Baidu and OnePlus have adopted BES solutions.

The integrated battery protection IC of silk screen 13A.

Silk screen VIA IC.

Laser carving 0067 2231 MEMS silicon microphone, used for call pickup.

The protective cover for the microphone pickup hole on the other side of the motherboard.

Connect the Pogo Pin of the touch sensing area.

TONTEK TTP 233DP single-channel touch chip, used to detect touch operations.

An LED indicator.

Take out the button battery, you can see the structure in the sound cavity.

The size comparison of button battery and holder with a coin.

Remove the bracket that secures the battery and motherboard.

Button battery comes from MIC-POWER, model M1254S2, diameter 12mm, thickness 5.4mm, rated voltage 3.7V, rated capacity 0.222Wh, 60mAh.

According to 52audio, there are already 2336321, Edifier, Vivo, Klipsch, Meizu, JEET, iQiyi, VIDVIE and other brands of earbuds products that use a large number of micro-electric new energy button batteries.

The layout in the sound chamber is displayed, the speaker unit is independently sealed, and two magnets are used to adsorb the charging cockpit. The charging contacts are connected to the main board through the FPC.

The Hall IC of silk-screened AGOV has TVS electrostatic protection on the soft board.

Remove the cover outside the speaker unit.

The speaker unit is connected to the main board through an FPC, which also integrates a bluetooth antenna for data transmission.

The cover plate is positioned by the plastic column and fixed by glue.

The location of the speaker unit.

The size of the dynamic driver is approximately 6mm.

All internal components of Meizu POP2s true wireless earbuds.

| 52audio summary

From the perspective of hardware disassembly, the structure of Meizu POP2s true wireless earbuds is not much different from the previous generation products. In terms of materials, the charging case uses a more integrated IC. The earbuds officially promotes a new double-layer structure composite diaphragm. The bluetooth master chip is replaced from the previous generation BES2300L to WT230-U, and the new support is opened and connected. And mobile phone pop-up window function.

Meizu POP2s charging case adopts Type-C interface input power, TPS SY8801 chip supports 28V input voltage, built-in full-featured charging and discharging overvoltage, overcurrent, overtemperature, short circuit protection and other functions, responsible for battery charging and discharging; TPS SY8801 also Integrating I2C communication function and internal communication isolation function, Nuvoton N76E003AQ20 MCU can read and configure the internal functions of the power supply and the parameters of battery charge and discharge management, and is responsible for the control of the whole machine. The opening and connecting function is realized by the Hall element, and the capacity of the soft pack battery is 350mAh, which is the same as the previous generation.

For the earphone part, the appearance of Meizu POP2s continues the classic design. The earphone shell follows the golden ratio, and the spiral design is more suitable for the auricle. However, this time the halo design is white. The official claim is that the white indicator light of the charging case is better. Unite. There is a plastic bracket inside the earphone to fix the battery and the motherboard, and the sound cavity is independently sealed to reduce noise. The structural design is the same as the previous generation. The touch solution comes from TONTEK 233DP, and the button battery supplier comes from MIC-POWER, with a capacity of 0.222Wh and about 60mAh.


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Source: 52audio

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