Shokz OpenFit Air is equipped with DirectPitch directional sound field technology to reduce sound leakage. It is equipped with a 18mmx11mm custom driver and supports professional dynamic low-frequency enhancement algorithm to bring a surging bass experience. It is equipped with dual microphones and supports cVc8.0 call noise reduction to keep the voice clear and stable. It also supports multi-point connection, IP54 dust and water resistance, has a single 6-hour battery life and a comprehensive 28-hour battery life. It supports fast charging function, charging for 10 minutes, and can be used for 2 hours.
We have previously disassembled Shokz products including: Shokz OpenFit, Shokz TREKZ AIR AS650, Shokz AS600 and Shokz TREKZ TITANIUM. Let’s take a look at the detailed teardown report of Shokz OpenFit Air.
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$125 – Shokz OpenFit Air Rview
01/ Shokz OpenFit Air Charging Case Teardown
Remove the charging case shell and take out the charging bin structure. There are magnets at the bottom of the charging bin to fix the earphones and the case lid.
The internal structure of the cavity, the motherboard is fixed by screws, the battery is fixed in the positioning groove by double-sided tape, and the wire is welded to the motherboard.
Remove the motherboard and battery.
The charging case has a built-in rechargeable lithium-ion battery, model: L1267, nominal voltage: 3.85V, rated capacity: 600mAh 2.31Wh, charging limit voltage: 4.4V, manufacturer: EVE Energy Co., Ltd., made in China.
Tear off the insulation protection, the circuit on one side of the battery protection board is equipped with an integrated lithium battery protection IC.
The integrated lithium battery protection IC with silkscreen 192XCAA 3W is responsible for overcharge, over-discharge, and overcurrent protection of the battery.
The circuit on one side of the charging case motherboard.
The circuit on the other side of the charging case motherboard.
The charging case is a Pogo Pin connector for charging earbuds.
A voltage regulator IC with screen printing R3.
A Hall element with screen printing AJ 3Q is used to sense the change in magnetic field when the charging case is opened/closed, and then notify the charging case MCU and earbuds to pair or disconnect with the connected device.
An LED indicator for feedback of charging status.
TPS SY8801 power management chip, in QFN24 package, is a single-chip solution designed for charging bins. The chip integrates charging module and discharge module, and the charging current and discharge cut-off current can be adjusted externally.
SY8801 can realize communication between charging case and earbuds by outputting power and ground. The chip integrates standard I2C interface and interrupt signal to facilitate communication between chip and MCU. At the same time, the chip also provides load detection and load insertion identification. SY8801 is very suitable for charging bin design, which greatly simplifies peripheral circuits and components.
Power management chip peripheral power inductor.
IC with silkscreen VQZA AAAG.
GigaDevice GD32E230C8T6 MCU. The GD32E23xx series is a 32-bit general-purpose microcontroller based on the ARM Cortex-M23 core with a maximum clock speed of 72MHz. It integrates up to 64KB of embedded flash memory and up to 8KB of SRAM memory, as well as various enhanced I/O and peripheral resources connected to two APB buses.
8.0000MHz crystal oscillator provides clock for the MCU.
02/ Shokz OpenFit Air Earphones Teardown
Remove the back cover of the earphone cavity.
Internal structure of the cavity – The battery and speaker are located on both sides of the cavity.
Inner structure of the cover – The hot melt column fixes the mainboard, and the battery and speaker wires are welded to the mainboard.
Take out the mainboard, battery and speaker.
Inner structure of the cover – The microphone pickup holes on both sides are sealed by rubber rings, and the silver in the middle is the LDS bluetooth antenna embedded in the cover and the electrode connected to the mainboard for touch detection.
Internal structure of the cavity – A magnet is set on the left, and the middle wire connects the charging contact.
The circuit on one side of the earphone mainboard.
The circuit on the other side of the earphone mainboard.
MEMS microphone of Laser Engraving N2 39G77, used for voice call function pickup. The two microphones work together to pick up sound, and with the call noise reduction algorithm, provide clear call effects.
Qualcomm QCC3040 BGA package ultra-low power bluetooth audio SoC. QCC304x supports Bluetooth 5.2 and aptX audio coding, integrating enhanced features such as stability, good sound quality, scalability, low latency and low bitrate audio transmission.
The QCC304x chip also supports Qualcomm TrueWireless Mirroring technology, and the left and right earphones can be quickly switched in multiple usage scenarios. Supports cVc call noise reduction technology. Supports touch or button to wake up the phone’s voice assistant. Active noise reduction function can also be integrated.
Bluetooth chip peripheral inductor to power its internal circuit.
32.000MHz crystal oscillator for providing clock for bluetooth chip.
Pogo Pin connector for connecting bluetooth antenna and touch detection electrode.
Bluetooth filter.
IC with silkscreen E63F QAA5.
Lithium battery protection IC with silkscreen 3U Vp.
The earphones are customized with high amplitude and high sensitivity drive unit to provide abundant bass and strong and stable treble effect.
After actual measurement, the drive unit is about 18mm long and about 11mm wide.
The earphones have built-in steel shell button battery, model: M1045S1, nominal voltage: 3.85V, rated capacity: 40mAh 0.154Wh, from MIC-POWER.
All components of Shokz OpenFit Air open-ear bluetooth earphones.
03/ Summary
Shokz OpenFit Air charging case adopts a rounded rectangular design, which is more compact than other ear-hook headphones. Compared with the previous model, the earphones have been further optimized, with slim ear hooks and skin-friendly silicone material, which is comfortable and light to wear. The newly added cavity structure improves the deformation ability of the ear hook and can better adapt to different ear shapes.
The earphones use Qualcomm QCC3040 bluetooth audio SoC, which is responsible for wireless connection and audio data processing. Two MEMS microphones are built in for voice pickup during calls. Custom high-amplitude and high-sensitivity speakers and 40mAh steel shell button batteries are used.
The design of the charging case is simpler than the previous model, and only includes the motherboard and battery. The built-in battery capacity is 600mAh. The motherboard uses the TPS SY8801 power management chip, which integrates the charging module and the discharge module, and supports communication between the charging case and earphones. The GigaDevice GD32E230C8T6 MCU is used to control the entire device.
PS: Translated from 52audio
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