Fidelio is a high-end series launched by Philips in 2011, including four series of X, L, M and S. Recently, two wireless headphones of the Philips Fidelio series were released, including Philips Fidelio L3 over-earnoise cancelling headphones, and the first true wireless noise cancelling headphones of the new “T” series——Philips Fidelio T1.

Philips Fidelio T1 true wireless noise cancelling earbuds continue the exquisite design of Fidelio’s high-end series, using a metal body with leather material, presenting a low-key luxury atmosphere. In terms of functional configuration, it is equipped with knowles armature+10mm dynamic driver, supports bluetooth 5.2, LDAC transmission, and has obtained Hi-Res AUDIO WIRELESS high-resolution audio certification.

Support mixed active noise cancelling, with three modes: high, low, and reduce wind noise. Support custom adjustment of transparency mode and noise cancelling of three-microphone ENC call. Other aspects also support wear sensing, multipoint connection, touch control, IPX4 waterproof, wireless charging and so on. In terms of battery life, the noise cancelling mode has a single 9-hour, comprehensive 34-hour long-lasting battery life. Under normal mode, it can achieve a comprehensive battery life of 13h+35h.

Before 52audio teardown – PHILIPS TAH9505, Philips TAT2205, Philips SHB4385 and Philips TAT1285. Let’s take a look at the detailed teardown report of this product.


|1. PHILIPS Fidelio T1 charging case teardown

From unpacking, we learned about the exquisite design of this product. Now enter the teardown part to see the internal structure configuration information.

Pry open the charging case shell and take out the headphone cockpit structure.

The internal structure of the charging case. In addition to the outer metal body, a layer of structure is set inside to fix the internal components of the charging case.

One side structure of the earphone cockpit. There is a bracket for fixing the wireless charging receiving coil on the top. The main board is set on the main board under the bracket, and the battery is located in the abdomen of the cockpit.

The structure on the other side of the cockpit.

The side structure of the cockpit is provided with a small board for charging the earphones, which is connected to the main board through a flat cable.

Cockpit bottom structure.

Remove the wireless charging receiver coil bracket.

The main board unit structure at the bottom of the cockpit is fixed by screws.

The function button small board and the small board cable for charging the earphones are both connected to the main board through the ZIF connector.

The battery is fixed on the other side of the bracket under the motherboard, and at the same time it plays a role in protecting the battery.

Remove the battery unit, the bottom structure of the cockpit. The function key board is fixed by screws, and is connected with the flat cable through the ZIF connector.

Remove the small board of the function buttons and the bottom structure of the cockpit.

Remove the screws, take off the small board for charging the earphones, and set a magnet underneath to absorb the earphones.

After removing all components, the cockpit bottom structure.

The charging case is the small board for charging/communication of the earphone and the cable connected to the motherboard.

There are three Pogo Pin connectors on one side of the small board, which are used for charging and communicating with the earphones.

A ZIF connector is set on the other side.

Function buttons and indicator light board circuit.

Two LED indicators of different colors.

MagnTek MT8691 unipolar, micro-power Hall-effect switch IC is used to sense the magnetic field changes when the charging case cover is opened and closed, and notify the charging case MCU and earphones to pair or disconnect with the connected device.

Function buttons for bluetooth pairing and connection.

The LED indicator that provides the light source for the external indicator light of the charging case is used for the charging status feedback of the charging case.

One side of the main board, wireless charging receiving coil and battery circuit in the charging case.

The other side of the circuit.

The wireless charging receiving coil is fixed on the magnetic shielding sticker and used for charging case wireless charging function.

The charging case uses a soft pack lithium-ion battery, model: PATL102429, capacity: 2.41Wh/650mAh, voltage: 3.7V, from PATL.

The battery is equipped with an independent circuit protection board, and the protection board is equipped with a lithium battery protection IC and MOS tube.

The circuit on the front of the motherboard.

On the back of the motherboard, single-sided devices, corresponding to the back of the chip through holes exposed copper for heat dissipation.

Two ZIF connectors for connecting other components.

Connect to the ZIF connector of the headphone charging board.

Type-C charging interface female socket.

MOS tube with silk screen 8205A.

The single-chip microcomputer of silk screen 052626.

TPS SY8801 TWS headset charging compartment SOC, specially designed for TWS headset charging compartment, based on the design to ensure safe and high reliability (support 28V input withstand voltage, built-in full-featured charging and discharging overvoltage, overcurrent, overtemperature, and short circuit Protection and other functions), I2C communication function and internal communication isolation function are also integrated. 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 in TPS SY8801 greatly optimizes the functional design of the intelligent TWS charging compartment, without complicated peripheral circuits, and the MCU can be realized by connecting and controlling 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 power management chip has been adopted by brands such as Xiaomi, OPPO, OnePlus, Realme, Transsion, MEIZU, 1MORE, Baidu, Edifier, JBL, HARMAN, Lenovo and other brands.

The IC of MicrOne S6UB.

TPS SY5320 overvoltage and overcurrent protection IC is a highly integrated protection IC with input undervoltage and overvoltage protection, lithium battery front-end overvoltage protection, load current abnormal protection, and overtemperature protection. Support 28V input withstand voltage, overvoltage shutdown protection is less than 1uS, support high-precision battery overvoltage protection function, adopt DFN-2×2-8L package.

COPO CP2022 is a single-chip, advanced and flexible wireless charging receiver chip. It can provide up to 3W of power for portable applications, has the advantages of high integration, high efficiency, low power consumption, etc., and meets the Qi V1.2.4 standard. On the outside of the chip are the resonant capacitors and filter capacitors used for wireless charging and receiving.

According to 52audio, the COPO wireless charging receiving solution has been widely adopted by TWS headphones of brands such as Xiaomi, OPPO, Edifier, Baseus, Sabbat, realme, omthing, iWALK, TOZO, etc.


|2. PHILIPS Fidelio T1 earbuds teardown

Enter the earphone teardown section. Pry open the back cover of the earphone along the mold line. The microphone cable is connected to the motherboard on the inside of the cover.

Open the BTB connector and take out the microphone.

A microphone acoustic structure is provided at both ends of the inner side of the cover. In the middle is the indicator light guide, on the right side there is a touch detection patch and a bluetooth antenna, which are connected to the motherboard through contacts.

The noise cancelling microphone unit is equipped with a silicone cover to improve the radio performance.

Laser carving 2128 7X03’s MEMS noise cancelling microphone is used for active noise cancelling and call noise cancelling functions to pick up external environmental noise. According to 52audio, this is the XINGANG SA2718T381-NB01-10-D21 analog MEMS microphone.

The microphone cable is connected to the motherboard through the BTB connector.

Take out the earphone motherboard, the battery is fixed on the back of the motherboard.

The internal structure of the cavity, you can see the speaker and optical sensor.

Take out the dynamic speaker and the infrared sensor, and an inward microphone and an armature driver are also installed inside the sound cavity.

Disassemble the internal components of the front chamber.

Laser carving R134 A12D MEMS microphone is used for noise cancelling function to pick up the internal noise of the ear canal.

Dynamic driver, connected to the infrared sensor cable through a wire.

The earphone optical infrared sensor is used for wearing induction function, realizes the function of automatically pausing music when picking up, and automatically resuming playback when wearing.

The flat cable is also connected to the motherboard through the connector.

The front of the headphone dynamic driver.

On the back of the dynamic speaker, the armature driver wire is soldered to the small board on the back.

After actual measurement, the speaker size is about 10mm, which is consistent with the official publicity.

The armature driver in the earphone, the laser engraving model 62462, comes from Knowles.

The earphone uses a soft-pack button lithium-ion battery, model: 1254, voltage: 3.7V, capacity: 60mAh/0.222Wh.

The circuit on the side of the earphone motherboard.

On the other side of the earphone motherboard circuit, the left side microphone is provided with a rubber cover to improve the radio performance.

The three metal copper pillars for charging/communication of the earphones are provided with rubber pads for sealing and waterproofing.

AIROHA AB1565AM bluetooth audio SoC. AB1565x is Dafa’s new generation bluetooth advanced audio solution, equipped with the latest BT5.2, capable of supporting LE audio. The latest multi-point for TWS, you can connect a laptop and a mobile phone at the same time and switch easily. Provides ultra-low power consumption and ultra-low latency performance, with an average power consumption of ~4.x mA, which is currently the leading power consumption level in the bluetooth audio market. It also has a stable bluetooth connection, clear sound quality and Hybrid active noise cancelling function, providing rich and powerful performance for bluetooth headphones.

Airoha AB1565x has built-in CM4 processor and Tensilica HiFi mini DSP on the hardware, embedded 4MB/8MB flash memory, integrated lithium battery charge controller and power management integrated circuit, and provides a variety of flexible package sizes and other options. In terms of software, it supports Google/AMA/Siri, etc., and provides IOS and Android reference APP development and design.

According to 52audio, bluetooth headsets on the market including Sony, Zepp Health Corporation, 1MORE, realme, FIIL, Edifier, Plantronics, earsopen and other brands have adopted Airoha solutions.

The crystal oscillator that provides the clock for the bluetooth chip.

Bluetooth filter.

Laser carving 2128 7X06 MEMS microphone is used for voice call pickup. The XINGANG SA2718T381-NB01-10-D21 analog MEMS microphone is also used.

Silkscreen 0aY IC.

Two LED indicators of different colors are used to feed back the status of the headphone.

The touch detection IC of the silk screen SP223D is used for touch operation.

Two female BTB connectors.

Metal dome connector used to connect the touch detection sensor.

The lithium battery protection IC of the silk screen 1UC3 is responsible for the protection functions of the battery such as overcharge, overdischarge, and overcurrent.

All components of PHILIPS Fidelio T1 true wireless noise cancelling earbuds.


|3. Summary

PHILIPS Fidelio T1 true wireless noise cancelling earbuds in appearance, the charging case adopts an oval cylindrical design, through the combination of metal body and leather soft and hard materials, it effectively enhances the sense of refinement of the product. The in-ear earphones are designed with clear structure and rich layers. The products are processed with aluminum alloy material and brushed polishing process, so that the product has a strong sense of texture and recognition.

Internal structure design. The charging case components are all connected to the motherboard through a flat cable and a BTB connector, with a built-in PATL 650mAh high-capacity battery. Support wired and wireless two ways to charge the battery. Wired adopts TPS SY8801 charging warehouse SOC, integrated I2C communication function and internal communication isolation function. Wireless uses the COPO CP2022 wireless charging and transmission chip, which complies with the Qi V1.2.4 standard and provides up to 3W of power. The main board adopts TPS SY5320 overvoltage and overcurrent protection IC, etc.

PHILIPS Fidelio T1 earbuds are equipped with a 10mm dynamic+knowles armature driver. Built-in 60mAh soft-pack button battery, single earphone is equipped with three MEMS microphones for noise cancelling and call function pickup, and infrared sensor is used for wearing detection. The headset main control chip uses AIROHA AB1565AM bluetooth audio SoC, supports bluetooth 5.2, has a stable bluetooth connection, clear sound quality and Hybridactive noise cancelling function, providing powerful and rich performance for the headphones.

Source: 52audio


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