Motorola MOTO BUDS CHARGE true wireless bluetooth earbuds teardown


The USB Type-C interface supports positive and negative blind plugging, which can avoid component damage caused by incorrect plugging or misplugging, and has strong compatibility, supports high-speed data transmission and high-power power supply. In recent years, it has been widely adopted by smart phones. Familiar to the public, the TWS earbuds charging case is gradually adopting the Type-C interface, which is convenient for users.

What 52audio will disassemble today is a true wireless earbuds with a charging case that comes with a Type-C interface charging cable. The product is called Motorola “MOTO BUDS CHARGE“. Through the charging cable that comes with the charging case, users can not only use the charger for For charging, you can also use a Type-C interface mobile phone to supply power for emergency charging when you are away. Of course, the charging case itself also has a Type-C charging interface, because the charging cable on the body is short, which may not be convenient in some scenarios.

In terms of other configurations, Motorola’s MOTO BUDS CHARGE earbuds has a built-in bluetooth 5.0 chip, supports IPX5 waterproof, and has a battery life of up to 10 hours. Let’s take a look at the detailed disassembly of 52audio.

52audio has disassembled and analyzed Motorola Verve Buds 800 true wireless bluetooth earbudss, Motorola Verve Buds 500 true wireless bluetooth earbudss, Motorola Verve Buds 200 true wireless bluetooth earbudss and Motorola Verve Ones+ true wireless bluetooth earbudss.

| 1. Motorola MOTO BUDS CHARGE unboxing


This time, Motorola adopted a new packaging style, mainly in dark blue. The rendering shows intuitively the use scene of the charging case with its own cable, and it is powered by a mobile phone. The upper left corner of the box is the Motorola brand Logo, the product name is “MOTO BUDS CHARGE” true wireless earbuds, and the bottom has bluetooth certification. There are hooks on the top of the box for easy display in offline stores.

Some product features are introduced on the back of the box.

The legend on the side of the box introduces the selling points of the earbuds, including: 10-hour battery life, IPX5 waterproof, microphone call, bluetooth 5.0, etc.

Product information on the bottom of the box.

The packaging box is designed to open sideways. Inside the box cover is the function promotion page of Lenovo Hubble APP. Use this APP to connect the earbuds to the mobile phone to wake up Amazon’s Alexa voice assistant.

Items in the box, earphones and charging case, charging cable, replaceable eartips and instructions for use.

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

Two pairs of replaceable silicone eartips, the earbuds comes with a medium size.


The charging case is a clamshell design, the sandblasting on the shell is more delicate, the transition part of the shell is relatively round, and the middle area of ​​the box cover has the Motorola brand logo.

The built-in charging cable is stored at the bottom of the charging case and is very mini.

On the front of the charging case, the USB Type-C charging interface and the charging cable interface are on the same side, and there is a charging case status indicator next to it.

52audio used the ChargerLAB POWER-Z KM001C portable power tester to perform wired charging tests on Motorola MOTO BUDS CHARGE, and the charging power was about 0.7W.

52audio uses the ChargerLAB POWER-Z KT002 portable power tester to test the charging cable that comes with Motorola’s MOTO BUDS CHARGE. The input power is about 0.6W. There is not much difference between the input power of the two charging methods. The lower power is because The battery level is high.


The earphones are placed in parallel in the charging case.

Pogo Pin for charging earphones.


Motorola MOTO BUDS CHARGE true wireless bluetooth earbuds.

The earbuds and charging case weigh 38.3g in total.

The single weight of the charging box is 30.4g.

The left and right earphones weigh 8.3g in total. Both the earbuds and the charging box are relatively small and light in weight.

| 2. Motorola MOTO BUDS CHARGE charging case teardown

After unpacking the box, we have a comprehensive understanding of Motorola’s MOTO BUDS CHARGE design. Let’s take a look at how its two power input interfaces are designed and what schemes are adopted through detailed disassembly.

Pry open the charging cockpit and connect it through a physical buckle.

On the inside of the charging cockpit shell, two magnets are used to fix the earphones, and one magnet is used to adsorb the lid.

The layout is displayed in the charging case. The soft pack battery is slender and fixed on the motherboard.

Light guide at the position of the indicator light.

It comes with a Type-C charging cable connected to the main board, and the enameled wire is covered with insulation.

There are no components on the motherboard side.

Circuit display on the other side of the motherboard.

The battery is fixed on the motherboard with double-sided tape.

Near the USB Type-C charging port, there is an overvoltage and overcurrent protection IC with silkscreen 01AHD.

TPS SY8810 is a cost-effective SoC chip specially designed for TWS earbuds charging compartment.

TPS SY8810 adopts QFN-16 package and integrates intelligent battery charging and discharging management functions and charging bin control management functions. Among them, the battery charging and discharging management functions include: switching lithium battery charging management with up to 1A charging current, with an efficiency of up to 93%; built-in NTC temperature protection function, which can realize the temperature protection of the lithium battery and segment charging current adjustment; charging and discharging with intelligence Path management function, when the battery is charged and discharged at the same time, discharge priority; 5V boost discharge output current up to 1A, and DC-DC boost efficiency conversion optimization for the application of TWS earphones, at 0.1A small current output The efficiency is 93%; the independent two-way output ensures the safety, reliability and intelligent control when charging the two TWS earphones.

TPS SY8810 also integrates the intelligent control and management functions of the charging compartment, including key control switches and support for HALL sensor detection of the charging compartment opening and closing the box; dual independent earphone in and out detection functions; the earphone is placed in and automatically starts the charging output- When the earphone is full, it will automatically turn off the output and enter standby mode; a variety of LED indicator UI functions-support 1~4 LED light status indication SY8810 greatly simplifies the product design of the TWS charging compartment, without complicated peripheral circuits, only a single chip and simple peripheral passive components are needed to realize the TWS charging compartment product design.

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, realme, Baidu, 1MORE, and 233621.

MOS tube used to control two power supply inputs.

Silkscreen 5352A9B is a SOT23-5 lithium battery protection IC of Suzhou Saixin Electronic Technology, which has protection functions such as overcharge, overdischarge, short circuit, and overcurrent.

The model of the soft pack battery is BZ501035, with a rated voltage of 3.7V and a rated capacity of 155mAh.

The battery wires are connected to the positive and negative electrodes of the battery, and the battery protection circuit is on the main board.

Pogo Pin for charging earphones.

Two LED indicators.

| 3. Motorola MOTO BUDS CHARGE earbuds teardown

Let’s continue to disassemble the Motorola MOTO BUDS CHARGE earphones, bean-type in-ear design, small size.

The touch area has Motorola’s classic Logo, and below it is the sound pickup hole and indicator opening of the call microphone.

The charging contact area on the inside of the earbuds is slightly concave.

The dust-proof net at the sound hole prevents foreign matter from entering.

Disassemble the earbuds along the parting line.

The internal circuits of the left and right earphones are similar, and the L/R distinction is written on the motherboard with a marker.

The inside of the box cover is displayed, the outer ring is a bluetooth antenna, and the middle position is the touch sensing area. The two are connected to the motherboard through metal contacts.

Connect the bluetooth antenna and the two Pogo Pins of the touch area.

The pickup hole of the microphone is next to the indicator light of the earphone, and the outer ring has foam to prevent light leakage and enhance the airtightness of the microphone.

The soft pack battery is attached to the motherboard with double-sided tape, and the plastic positioning column in the earphone case is used to fix and support the motherboard.

The PCBA where the charging contacts are located is connected to the motherboard through wires. Below is the magnet for the charging cockpit.

The dynamic driver is also connected to the motherboard through wires.

The size of the dynamic driver is about 5mm.

Comparison of the size of the earbuds motherboard and soft pack battery with a dollar coin.

Circuit display on the side of the earbuds motherboard.

Circuit display on the other side of the earbuds motherboard.

The main control chip of Motorola MOTO BUDS CHARGE is JieLi AC6936D, which is a low-power bluetooth audio and BLE integrated chip launched by Jie Li Technology in 2018 and supports bluetooth 5.1 protocol. Built-in 32-bit RISC architecture CPU and professional audio DSP, easy for developers to debug EQ.

JieLi AC6936D adopts 4*4 QFN32pin package, and its no-load working power consumption is only 6 mA. It supports master-slave switching, bilateral calls and smart charging compartment, which is convenient for production.

According to 52audio, a large number of bluetooth audio products from brands such as Lenovo, Xiaomi, Baseus, Sony Ericsson, MEES, and Sheng Gao have adopted JieLi solutions.

Details of JieLi AC6936D.

Laser carving F95M 0012’s MEMS silicon microphone is used to pick up human voices during calls.

Vinka VKD233DH touch sensing IC, used to detect the touch operation of the earbuds.

Details of Vinka VKD233DH.

The earbuds uses a soft pack battery, model: NY581013P, rated voltage: 3.7V, rated capacity: 50mAh/0.19Wh.

A close-up of the battery protection board, providing battery overvoltage, overdischarge and overcurrent protection.

Motorola MOTO BUDS CHARGE all components.

| 52audio summary

Motorola MOTO BUDS CHARGE is convenient for users to charge, the charging box comes with a USB-C interface charging cable, which can be used for emergency power supply by mobile phones, and it is more concealed to be stored at the bottom of the box when not in use. Both the earbuds and charging case are relatively small and the design is relatively simple.

In terms of internal circuits, the charging case also has a Type-C interface for input power. The two charging interfaces have no effect on the charging rate. There are MOS tubes inside to control the two power supply inputs. The charging case adopts TPS SY8810, which integrates intelligent battery charging and discharging management functions and charging compartment control and management functions, which greatly simplifies the product design of the TWS charging compartment; the charging case soft pack battery capacity is only 155mAh, and XySemi XB5332A9B is responsible for battery overcharging Over-discharge protection; TVS inside the charging compartment for protection to prevent electrostatic breakdown.

The bluetooth main control chip of the earbuds is JieLi AC6936D, which supports bluetooth 5.1, and the no-load working power consumption is only 6 mA. It supports master-slave switching, bilateral calls, and lithium battery charging; the earbuds’s touch solution comes from Vinka VKD233DH, and the soft pack battery capacity is 50mAh , A single microphone is used for call pickup.

$44.99 at Amazon US

Make sure it says “ships from and sold by” to avoid counterfeits.

Source: 52audio


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