Xiaomi Buds 5 is equipped with dual magnetic drive unit, which provide a wide-band response range of 16~40kHz and a large amplitude of 0.5mm. It supports Qualcomm Snapdragon Sound technology and aptX Lossless audio transmission, with a transmission rate of up to 2.1Mbps, and has obtained Hi-Res audio certification.
Xiaomi Buds 5 supports intelligent dynamic bass function, monitors ear canal structure and wearing method, and adjusts low-frequency compensation coefficient in real time. With the new bass tube system, the low-frequency quantity is greatly enhanced. It supports independent spatial audio function to provide more immersive surround sound. Joint tuning with Harman brings Harman AudioEFX mode to provide a better listening experience.
Xiaomi Buds 5 supports ANC mode, which improves the comfortable noise cancelling ability by 40% compared with the previous model. It supports AI call noise cancelling function, with a built-in three-microphone system for accurate sound pickup, and with the AI noise cancelling algorithm, it greatly reduces ambient noise, while improving the wind noise resistance by 33%.
In other aspects, the Buds 5 supports multipoint connection and 50ms low latency mode. A new earbud independent recording function is added, and the recording can be converted into text through the Xiaomi Headphones App. The single battery life is up to 6.5 hours, and the total battery life is about 39 hours.
We have previously teardown the Xiaomi products including: Xiaomi Buds 4, Xiaomi Buds 3 Pro, Xiaomi FlipBuds Pro, Redmi Buds 5 Pro, Redmi Buds 4 Pro, Redmi Buds 4 Lite, Xiaomi Watch S3, Redmi Watch 4, Xiaomi Band 8, Redmi Band 2, Xiaomi Sound, Xiaomi Sound Move, etc. Let’s take a look at the detailed teardown report of Xiaomi Buds 5.
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$110 – Xiaomi Buds 5 Review
01/ Xiaomi Buds 5 Charging Case Teardown
Disassemble the bottom shell of the charging case.
Charging bin front structure, LED indicator is sealed by the hood.
The charging bin back structure, battery is inside the cavity.
Remove the screws, take out the battery and motherboard.
The circuit on one side of the charging case motherboard, with a Type-C charging port in the middle.
The circuit on the other side of the charging case motherboard.
LPS LP7811 has a built-in switch charging PMIC, supports 4.1V to 6.0V input voltage, and a maximum input withstand voltage of 30V. IIC programmable output, charging current up to 1.7A, efficiency up to 95%, and charging current accuracy up to 5%. Voltage accuracy up to 0.5%, with path management, priority earphone charging. Synchronously built-in high-current LDO function, can meet the power supply of MCU and various indicator lights.
LP7811 supports intelligent discharge voltage management function, and maximizes the charging efficiency of the charging case to the earbuds through the ultra-low voltage difference voltage follower charging solution, thereby improving the battery life. When used with the companion charging chip (LP408X) in the earbuds, the VOL and VOR outputs automatically track the earbuds’ battery voltage, minimizing power loss.
The Chipsea CS32F031K8V6 MCU is responsible for charging case control.
XySemi XB5225J2SZ integrated lithium battery protection chip is responsible for overcharge, overdischarge, overcurrent and load short circuit protection of the battery.
WillSemi ESD56241D TVS protection tube. The ESD56241DXX series is a transient voltage suppressor designed to protect the power interface. It has high surge capability and is suitable for replacing multiple discrete components in portable electronic devices. It adopts DFN2x2-3L package, and the standard product is lead-free and halogen-free.
Prisemi P14C2N overvoltage and overcurrent protection IC is used to protect the subsequent devices.
Remove the bottom bracket of the charging bin.
Remove the FPC fixed on the charging bin. There are three magnets at the bottom of the charging bin to fix the earbuds and the charging case lid.
FPC circuit.
Three LED indicators of different colors are used to feedback bluetooth pairing and charging status.
Pogo Pin connector for charging earbuds.
The Hall element with silkscreen “AR4H” is used to sense the change in magnetic field when the charging case lid is opened/closed, thereby notifying the charging case MCU and earbuds to pair or disconnect with the connected device.
The charging case has a built-in rechargeable lithium-ion battery, model: BW50, rated capacity: 480mAh/1.824Wh, nominal voltage: 3.8V, charging limit voltage 4.35V, manufacturer: Chongqing VDL Electronics Co., Ltd.
02/ Xiaomi Buds 5 Earbuds Teardown
Disassemble the earbud head – the right side is the speaker unit structure, and the left cavity is sealed by the cover.
Take out the speaker.
The bottom structure of the cavity, the backfeed noise cancelling microphone is set on the bracket. The capacitive in-ear detection sensor is fixed under the bracket.
The MEMS microphone of the laser carving R45R is a backfeed noise cancelling microphone, which is used to pick up sound from the inside of the ear canal to further enhance the noise cancelling effect.
The front of the earbud speaker. According to the official introduction, a customized dual magnetic unit is used to support an ultra-wide frequency response range of 16~40kHz and an ultra-large amplitude of 0.5mm.
After actual measurement, the speaker diameter is about 10.88mm.
Remove the back cavity cover and set the battery inside.
Take out the battery and you can see the circular motherboard at the bottom of the back cavity.
Remove the back cover of the earbud-stem.
The inner structure of the cover is equipped with a bracket and an LDS laser antenna. FPC is a pressure sensor module.
The pressure sensor supports pressing, long pressing and sliding control. The FPC BTB connector is from OCN, model: OK-114GM008-35.
The internal structure of the earbud-stem, the PCB board is fixed by hot melt pins.
Take out the internal battery and motherboard.
There is a charging connector and magnet at the bottom of the earbud-stem.
The main circuit inside the earbud, all components are connected in series on a cable.
The circuit on one side of the earbud motherboard.
LPS LP4081 ultra-low power linear charger supports 16V withstand voltage, programmable charge current up to 1A, programmable float voltage accuracy of 0.3%, and programmable trickle charge and termination current. LP4081 has an ideal diode mode for high efficiency and low heat operation. LP4081 integrates power path management to support SoC power-up even with a deeply discharged battery. LP4081 has a low Rds on of 150mΩ from the battery to the system’s BAT_FET, which enables high discharge efficiency and low heat over the full load range.
LP4081 provides an I2C interface to enable device programmability and flexibility. LP4081 provides rich protection, including input undervoltage lockout protection (UVLO), input overvoltage protection (OVP), and system short circuit protection (SCP). The typical quiescent current of LP4081 is 0.6µA, and the battery current drops to 0.4µA in shipping mode.
Qualcomm QCC3081 bluetooth audio SoC, with an extremely low power design. Supports Bluetooth 5.4 and Qualcomm TrueWireless mirroring technology to provide stable connection. Supports LE Audio and Auracast broadcast audio functions. Supports Qualcomm aptX Adaptive and active noise cancelling (ANC).
Snapdragon Sound is a complete set of audio technologies from Qualcomm, including aptX audio technology, aptX Adaptive adaptive audio technology, aptX Lossless audio technology, aptX Voice voice call technology, cVc echo cancellation and noise suppression technology, and Qualcomm ANC technology, which can support up to 24-bit 96kHz high-resolution bluetooth streaming.
Metal dome connected to the bluetooth antenna.
The circuit on the other side of the motherboard.
The 6-axis gyroscope with screen printing I467P, model: ICM-42670-P, from TDK, used for spatial audio function to collect user head movement data.
The crystal oscillator used to provide clock.
Built-in steel shell button battery in the earbuds, model: 1042Q1, capacity: 35mAh. The steel shell button battery comes from Xiaomi Technology Japan Co., Ltd., made in China.
The circuit on one side of the earbud-stem.
The circuit on the other side of the earbud-stem.
MEMS microphone of the laser carving R45R is a call microphone, used for voice call function to pick up human voice, from RAYKING. The one on the right is the BTB connector for connecting the pressure sensor module, from OCN, model: OK-114GF008-35.
Metal dome connected to the bluetooth antenna.
The MEMS microphone of the laser carving R44E is a feedforward noise cancelling microphone, which is used for the noise cancelling function to pick up external environmental noise. It comes from RAYKING.
Two Sunlord SDCL0603Q series multilayer ceramic inductors. Through the carefully designed coils and electrodes, high Q value and high self-resonant frequency (SRF) are achieved. Made by the laminated dry process, it can provide high-precision and high-consistency products to meet the stringent requirements of precision electronic components.
All components of Xiaomi Buds 5 true wireless noise cancelling earphones.
03/ Summary
Xiaomi Buds 5 continues the design language of the previous model, the overall compact and lightwight. The open charging case structure is very convenient to use. The earbuds are designed in a semi-in-ear musical note shape with a circular tuning hole, which is highly recognizable.
The charging case has a built-in 480mAh lithium battery, and the earbud has a built-in 35mAh steel shell button battery. The power management system uses the LPS LP7811+LP4081 combination solution, which supports the voltage follow charging function, thereby minimizing the power loss of the charging case battery to the earbud battery conversion, thereby improving the overall battery life of the product. And there is no need for MCU participation in the whole process, making the application more simple and convenient.
The charging case uses Chipsea CS32F031K8V6 MCU, XySemi XB5225J2SZ lithium battery integrated protection chip, WillSemi ESD56241D TVS protection tube and Prisemi P14C2N overvoltage and overcurrent protection IC. The earbuds is equipped with dual magnetic drive units and 3 MEMS microphones, Qualcomm QCC3081 bluetooth audio SoC, TDK ICM-42670-P 6-axis gyroscope and Sunlord SDCL0603Q series multilayer ceramic inductor.
PS: Translated from 52audio
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