The appearance design of SONY INZONE Buds is very cool and has an e-sports style. The earbuds is equipped with an 8.4mm X driver unit with the same specifications as Sony WF-1000XM5, providing low distortion and clearer sound quality. They uses Sony L1 low-power processor and supports 2.4GHz wireless connection with a delay as latency as 30ms. The single battery life is about 12 hours.
Sony INZONE Buds supports 360 game spatial sound effects and can virtually output sound into 7.1 channels, bringing more accurate soundstage positioning and a more immersive experience. New spatial sound personalization functions, including soundstage personalization and tone personalization, provide a spatial audio listening experience that is more suitable for you. INZONE Buds also uses dual noise sensor technology, supports active noise cancellation function and 20 levels of adjustable ambient sound. Equipped with deep neural network learning (DNN) technology, it supports AI call noise cancellation, and game voice calls make the voice clearer.
We have previously disassembled SONY products including: Sony WF-1000XM5, Sony LinkBuds S, Sony WF-1000XM4, Sony WF-H800, Sony WF-SP900, Sony WH-CH720N, Sony INZONE H9, Sony WH-XB910N, Sony WH-1000XM5, Sony WH-1000XM4, Sony WH-1000XM3, Sony PlayStation 5 PULSE, Sony Float Run, Sony LinkBuds, Sony XPERIA Ear Duo, Sony SRS-XB100, Sony SRS-XB13 and Sony HT-S40R.
01/ SONY INZONE Buds Charging Case Teardown
Disassemble the charging case shell and take out the charging bin structure.
The front structure of charging bin.
The structure on the back of the charging bin.
The bottom structure of the charging bin secures the motherboard and battery through brackets. The battery is covered with sponge pad protection.
Remove the screws, unhook the connectors, and remove the motherboard and battery unit.
The bracket structure under the motherboard is fixed with screws and charging bin.
Remove the bracket and take out the small plate fixed at the bottom of the charging bin.
The bottom structure of the charging bin is equipped with four magnets for fixing earbuds, adapters and charging case covers.
The circuit on one side of the small board, solder the small board wires for charging the earbud.
The circuit on the other side of the small board is connected to the mainboard FPC through a connector.
LED indicator light for feedback of bluetooth pairing and charging status.
Silk screen DA IC.
Silk screen A9 3W IC.
Two small pads for charging earbuds.
The other side of the small board is soldered to the wire.
Pogo pin connector for charging earbuds.
The circuit on the side of the charging case motherboard.
The circuit on the other side of the charging case motherboard.
The bluetooth pairing function button.
Silk screen 20401 IC.
Receptacle for connecting battery wire.
TI BQ25618 charging IC integrates switching charging, synchronous boost converter and voltage protection functions. It supports 22V withstand voltage and can reduce battery leakage to 6uA in transport mode, which is used to charge the built-in lithium battery and earbuds.
Silk screen 2201 IC.
Connect the FPC connector to the small board.
The NXP K32 L2B series microcontroller has a built-in ARM Cortex-M0 core and is used to implement functions such as charge and discharge module management, battery power management, indicator light control, and headset communication.
Silk screen 6N30P9 IC.
Silk screen 306 Z9 IC.
Silk screen A33 IC.
Silk screen 75 UU IC.
The charging case has a built-in rechargeable lithium-ion battery pack, model number: 731734, rated capacity: 450mAh 1.733Wh, nominal voltage: 3.85V, charging limit voltage: 4.4V, manufacturer: Chongqing VDL Electronics Co.,Ltd.
Tear off the outer label and make sure the information on the battery core is consistent with the outer label.
The circuit on one side of the battery protection board.
Silk screen 530 920 lithium battery protection IC is responsible for battery overcharge, overdischarge, overcurrent, etc. protection.
Silk screen 2003 VL MOS tube.
BOURNS battery circuit breaker for battery overheating and overcurrent protection.
02/ SONY INZONE Buds Earphones Teardown
Remove the back cover of the headphones. There are bluetooth antennas and touch detection electrodes printed on the inside of the cover.
The internal structure of the cavity is set to connect the motherboard and FPC through the BTB connector.
Take out the motherboard, which is protected by a shielding cover.
Remove the shielding cover and the circuit on one side of the motherboard.
The circuit on the other side of the motherboard.
The MEMS microphone of Laser Engraving M3 37612 is used for voice calls and active noise cancellation function.
Silk screen D3277 Sony L1 low power processor.
The laser-engraved D32324 crystal oscillator provides the clock for the processor.
Connect to the BTB connector of the FPC.
The metal dome that connects the bluetooth antenna and touch detection electrodes.
Silk screen 11 21102 IC.
Silk screen 37 02 IC.
Silk screen 20401 IC.
Silk screen 75 UU IC.
Silk screen 73 3N IC.
The internal structure of the middle frame of the earbud is fixed with a battery, which is connected to the FPC, an internal component of the earbud cavity, through a BTB connector.
Open the connector, remove the middle frame, and take out the battery and FPC.
The internal structure of the middle frame is equipped with magnets and charging cases at the end for adsorption and fixation.
The earbud is equipped with a steel-shell button battery. The negative electrode is screen-printed with parameter information. Model: Z55FH, nominal voltage: 3.85V, capacity: 0.366Wh, from ZeniPower.
The Circuit on the FPC side of the battery.
The circuit on the other side of the battery FPC.
The metal copper pillar connected to the charging case.
Connect the BTB connector of the speaker FPC.
Connect to the motherboard’s BTB connector.
The speaker structure inside the front cavity of the earbud.
Take out the speaker and FPC, and set the microphone at the end of the FPC.
On the front of the 8.4mm X driver unit, the diaphragm is protected by a plastic cover, and the sound hole is protected by a wire mesh.
The back of the X driver unit.
One end of the speaker FPC is provided with a BTB connector to connect to the battery FPC.
The other end of the FPC is equipped with an in-ear detection sensor and a microphone.
Laser-engraved M3 37696 MEMS microphone is used to pick up sound from inside the ear canal. The two microphones work together to provide more accurate active noise cancellation and clearer voice call effects.
Infrared distance sensor is used for the in-ear detection function, which automatically pauses music playback when the earbuds are taken off, and automatically resumes playback when the earbuds are put on.
03/ Dongle Teardown
Disassemble the dongle casing and take out the internal motherboard.
The circuit on one side of the motherboard is dongle, and the wireless SoC is protected by a shield.
The circuit on the other side of the motherboard.
Remove the shielding cover and see the wireless module circuit below. AIROHA AB1565D bluetooth audio SoC. The AB1565x series is Airoha’s advanced bluetooth audio solution, supporting Bluetooth 5.3 and LE audio. The latest multi-point for TWS can connect laptops and mobile phones at the same time. Provides ultra-low power consumption and ultra-low latency, with average power consumption up to ~4.x mA. AB1565x also has stable bluetooth connection, clear sound quality and Hybrid ANC function.
The precision wound inductor on the periphery of the bluetooth audio SoC supplies power to the internal circuit.
The crystal oscillator that provides the clock for the bluetooth chip.
Silk screen 73 ee IC.
Silk screen L05 IC.
Switch button for mode switching.
Function button for reset.
LED indicator for feedback of working status.
All components of SONY INZONE Buds wireless noise cancellation gaming earphones.
04/ Summary
SONY INZONE Buds charging case has a compact design and accommodates earbuds and dongle inside. The earbuds is treated with gloss + matte technology, which is highly textured and recognizable. The new in-ear structure designed based on long-term wearing requirements reduces contact with the ears. Equipped with four sizes of eartips, it provides a personalized and comfortable wearing experience.
The charging case has a built-in VDL 450mAh rechargeable lithium-ion battery pack. Use the TI BQ25618 charging IC, which integrates switching charging, synchronous boost converter and voltage protection functions – used to charge lithium battery and earbuds. The NXP K32 L2B series microcontroller is used to control the charging case.
The earbud is equipped with a ZeniPower 0.366Wh steel shell button battery, an 8.4mm X driver unit and two MEMS microphones. An infrared distance sensor is used for in-ear detection function. Using Sony L1 low-power processor for wireless connection and audio data processing. The internal wireless module of the dongle uses AIROHA AB1565D bluetooth audio SoC, which is used for 2.4G wireless communication with earbuds and support LE audio audio technology.
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