Philips TAT1285 true wireless bluetooth earphones teardown


Royal Philips of the Netherlands is a large multinational company that has launched many home speakers, headphones and wireless speakers for the audio market. At present, there are more than a dozen models of Philips true wireless earphones, each with its own characteristics. 52audio has disassembled two types of Philips TAT2205 and Philips SHB4385 before.

Today is the Philips TAT1285 true wireless bluetooth earphones. Both the earphones and charging case of this product adopt a lightweight design and are very light. The earphones uses a bluetooth 5.1 chip, which supports the voice assistant of the phone to wake up the phone. The single battery life of playing music is about 6 hours, the charging case can add 12 hours of playing time; the earphones supports touch control, built-in 6mm neodymium magnet drive unit, IPX5 splash-proof for sports wear, and the microphone supports echo cancellation to ensure clear calls. Let’s take a look at the structure design and materials of this new Philips true wireless earphones.

| 1. Philips TAT1285 true wireless bluetooth earphones unboxing

The packaging box is the elegant style of the Philips brand, from color matching to layout. There is a product label in the upper left corner: PHILIPS earphones, 1000 series, comfort fit, 18 hours playtime, IPX5 splash proof. The renderings of the earphones and charging case are in the lower position, and the color of the picture is the color of the product inside. At the top is the product category “True Wireless earphones”, and the bluetooth certification mark is in the lower left corner.

The back of the box gives a brief introduction to the features of the product: Philips TAT1285 in-ear true wireless earphones, great sound, snug-fit, IPX5 splash and sweat resistant, touch control, charging case for extra 12hours playtime, smart pairing.

Feature highlights on the side of the box: bluetooth 5.1, touch control, 6+12 hours, IPX5 splash proof, comfort fit, mic and control.

The other side of the box introduces some of the technical specifications of the earphones, including: frequency range 20Hz-20KHz; sensitivity 98dB (1KHz); impedance 16Ω; maximum input power 3mW; speaker 6mm; bluetooth transmitter frequency range 2.402-2.480GHz; bluetooth transmission Power <9dBm; bluetooth transmitter range <10 meters.

The packaging box is designed with a side opening lid, and the inside shows the correct way to wear the earphones, the name and content of harmful substances in the product.

What’s in the box, earphones and charging case, silicone eartips, charging cable and quick guide.

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

Two pairs of replaceable silicone eartips, M size on the earphone, to adapt to the size of the ear canal of different people. The color of eartips is consistent with the earphone and charging case.

The charging case has the PHILIPS brand name in the middle area of ​​the lid.

The bottom is a flat surface, which is more stable when placed. Product information: Model TAT1285, input 5V⎓500mA, energy 1.29Wh. Made in China, MMD Shanghai Electronics Trading Co., Ltd.

On the front of the charging case, the lid of the charging case is raised slightly to increase the internal space; there is a groove at the opening of the lid for easy opening; the indicator light below can show the charging status of the charging case.

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

52audio used the ChargerLAB POWER-Z KM001C portable power tester to perform a wired charging test on the Philips TAT1285 true wireless bluetooth earphones. The charging power is about 1.9W.

The state of the earphones in the charging case. The charging cockpit is a sloped design, and the position of the earphone is marked with L/R.

Pogo Pin for charging earphones.

The earphones and charging case weigh a total of 37.3g.

The charging case alone weighs 28.2g.

The left and right earphones weigh 9.1 grams. The weight of the earphones and the matching charging case are very light.

Philips TAT1285

Philips TAT1285 wireless earphones——Red version.

| 2. Philips TAT1285 charging case teardown

After unpacking the box, we have a comprehensive understanding of the appearance of Philips TAT1285. 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.

First disassemble the charging case and pry open the charging cockpit to see the internal structure.

There is a circle of black foam on the outside of the light guide at the position of the indicator to avoid light leakage.

Internal structure of charging case, “hamburger” stacking.

The soft pack battery is pasted on the main board, and the main board is fixed on the shell by screws.

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

Charging case internal circuit.

On the other side of the internal circuit of charging case, the battery is pasted with double-sided tape..

The motherboard circuit has a MCU power management chip with high integration.

On the other side of the motherboard circuit, heat dissipation is through holes at the MCU main control chip.

Sinhmicro SS809 is an AD-type microcontroller with integrated charge and discharge management, with built-in rich interface functions, flexible configuration modes and different low-power options. Mainly used in portable electronic devices that require charging and intelligent control, bringing streamlined peripheral costs, excellent performance and convenient development. Shengsheng Micro SS809 has a built-in linear charging unit to charge the lithium battery, and has a dedicated earphones communication interface to achieve two-way communication between the charging case and the earphones. There is also the QW series that supports wireless charging to meet different product specifications.

Sinhmicro SS809 integrates MCU microprocessor and embedded flash memory, which makes it easier to upgrade its firmware, which is convenient for engineers to add personalized customization functions. Especially in terms of power display, in addition to controlling the display of 1-5 lights, it also supports RGB lighting effects, LED 188 digital tubes, customized patterns, etc., providing engineers with free programming space.

According to 52audio, many TWS earphones charging cases, including Skullcandy, Edifier, 1MORE, FIIL, Astrid, Kugou, Nubia, etc., all adopt Sinhmicro’s solutions.

The silk screen A1SHB is LPS LPM2301 2.6A PMOS, which is the larger current version in the industry, with enough margin to ensure safety; the silk screen A2SHB is LPS LPM2302 3.0A NMOS, with a voltage resistance of 20V; both are in SOT-23 package, used to charge the earphones switch.

Boost IC of silk screen W8TD and a 47μH inductor.

The charging case uses a soft pack battery, from PATL, model PATL622029, with a rated capacity of 350mAh, an energy of 1.3Wh, and a rated voltage of 3.7V.

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

Gold-plated Pogo Pin for charging earphones.

An LED indicator is covered with a layer of black foam to avoid light leakage.

| 3. Philips TAT1285 earphone teardown

Let’s continue to disassemble the Philips TAT1285 earphone part. The earphone is a bean-type in-ear design and has a mini size. It can be put into the auricle when worn.

The earphone shell supports touch control, and the design is similar to the charging case. The center area has the Philips brand name.

The status indicator of the earphones.

The pickup hole of the call microphone.

The two charging contacts of the earphones, below is the L/R logo of the earphones.

The pressure relief hole on the sound cavity shell balances the internal and external air pressure.

The fine dust-proof net of the sound mouth prevents foreign objects from entering. The speaker unit on the inside can be vaguely seen.

The earphone is composed of a three-part shell, and the middle frame has obvious color difference.

First look at the structure of the outside of the earphones.

The earphone shell is embedded in the middle frame and sealed with glue to improve dust and water resistance.

Inside the shell. The outer ring is a bluetooth antenna, and the middle part is a metal foil for touch sensing.

The light guide at the position of the indicator light and the pickup hole of the call microphone. A black rubber cover simultaneously achieves the two functions of avoiding light leakage from the indicator light and improving the microphone’s pickup capability.

The motherboard is fixed on the middle frame with glue.

The components in the sound cavity are connected to the main board through FPC and connectors.

Disconnect the connector and separate the middle frame and the housing of the sound cavity part. The battery is fixed on the other side of the motherboard.

Remove the battery to see the inside of the motherboard.

The internal structure of the earphones is complete.

Comparison of the size of the earphones motherboard and battery with RMB coin.

The circuit on the side of the earphones motherboard.

Circuit on the other side of the motherboard.

Philips TAT1285 true wireless bluetooth earphones uses JL AC6956A bluetooth audio SoC. Support bluetooth 5.1, support SBC/AAC audio coding, support single and double microphone ENC, adopt QFN32 4×4 package.

Details of JL AC6956A.

Charging IC for silk screen T50A.

Laser carving R035 A51D’s MEMS silicon microphone is used to pick up the human voice during a call.

Two gold-plated Pogo Pins, the left one is connected to the FPC antenna, and the right one is connected to the touch sensor foil.

PT2042 single-channel touch detection chip, from PinTeng Technology Co., Ltd. The chip has a built-in voltage regulator circuit to provide a stable voltage for the touch sensing circuit. At the same time, the integrated touch detection algorithm makes the chip have a stable touch detection effect.

Lithium battery protection IC with silk screen 0dB3.

Two LED indicators.

There is a wire on the battery tape to connect to the main board to protect the ground.

The earphone uses a button-type soft-pack battery, and the positive and negative nickel sheets are on the same side, and are connected to the main board through wires.

Battery model MLA1254, rated voltage 3.7V, rated capacity 60mAh, energy 0.222Wh.

Finally, let’s take a look at the layout of the sound cavity. The wire of the speaker unit is soldered to the PCB, the charging contacts of the earphone are also soldered to the PCB, and the PCB is connected to the motherboard through the FPC.

The PCB in the sound cavity is fixed by rubber hot melt. The magnet next to it is used to attract the charging cockpit.

Speaker unit side.

The speaker unit size is 6mm, consistent with the publicity.

Philips TAT1285 true wireless bluetooth earphones has components.


The Philips TAT1285 true wireless bluetooth earphones has a small body size, a compact internal space, and a relatively simple exterior design, with the main goal of lightness and practicality.

The Philips TAT1285 earphone is a bean-shaped earphone design and consists of a three-part shell. The shells on both sides of the inner and outer sides are embedded in the middle frame, and there is a sealant inside to achieve better dust and water resistance. The main control chip of the earphones is JL AC6956A, supports bluetooth 5.1, and supports single-microphone environmental sound cancellation; the earphones uses a capacitive touch solution with PinTeng PT2042 touch detection chip; the earphones uses a soft-pack button battery with a rated capacity of 60mAh.

The charging case inputs power through the USB Type-C interface. The power management chip is Sinhmicro SS809, which integrates charging and discharging management functions. At the same time, there is a dedicated earphones communication interface to achieve two-way communication between the charging case and the earphones; the LPS MOS tube is used to charge the earphones Switch; the soft pack battery comes from PATL with a capacity of 350mAh.

Source: 52audio


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