Nokia E3101 true wireless earphones teardown

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With the addition of the active noise reduction function, most high-end products on the current TWS headset market adopt an in-ear design, which can provide users with the best noise reduction effect. The semi-in-ear headphones are also loved by many users due to their lightweight body and comfortable wearing experience. At present, many brands are also doing this market and launching corresponding products.

The Nokia E3101 true wireless earphone is one such product. The weight of the whole machine is less than 40g, which is very small and portable. The earphone adopts a handle-shaped semi-in-ear design. The official weight of the earphone is only 3.4g. With an ergonomic in-ear curve and angle, it provides a light and comfortable wearing experience.

In terms of configuration, Nokia E3101 uses 13mm dynamic driver, bluetooth 5.1 chip, supports ENC call noise reduction, supports open cover connection, single and double ear use and touch operation. Such a lightweight body has a single battery life of 6.5h, and the overall battery life is 29 hours. 52audio also disassembled the NOKIA P3600 hybrid bluetooth earphones before. Let’s take a look at the design and internal structure of this product today.

|1. Nokia E3101 true wireless headset unboxing

Nokia E3101 earphones

The packaging box is designed in a simple Nordic style, and the overall appearance of the product is displayed in a large area on the front, as well as the NOKIA brand LOGO and the product name of the Nokia E3101 true wireless earphones.

The graphics on the side of the box show 5 product features, including more than 20 hours of battery life, bluetooth 5.1, dynamic bass, lightweight design, and comfortable fit to wear.

The back of the box is a picture of the product model wearing scene.

The other side also introduces the product features, Morandi color, mini body, battery display, 24/7 communication assistant, etc.

The items in the box include earphones, charging cables and product manuals.

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

Nokia E3101 earphones

The overall appearance of the Nokia E3101 true wireless earphones this model is a fast blue color.

Nokia E3101 earphones

On the front of the charging case, there is a chamfer at the opening of the cover, and there are four indicators below to display the remaining power of the charging case.

Nokia E3101 earphones

There is a function button on the back of the headset to display the battery.

The USB Type-C charging port is located at the bottom of the charging case.

The top is designed with “NOKIA” brand LOGO.

The headset is placed vertically in the charging case, and the L/R logo is set on the cockpit.

The metal thimble for charging the headset is located at the bottom of the cockpit.

Nokia E3101 earphones

The overall appearance of the Nokia E3101 earphones.

The raised oval point on the earphone handle does not have a physical button, but to improve the accuracy of blind control, there is an indicator light above it.

The NOKIA brand LOGO on the earphone handle.

L/R logo is designed on the inside.

At the bottom of the headset handle are the charging contacts and the call microphone.

There is a large pressure relief hole on the inside of the earphone, which is protected by a dust-proof net inside.

A smaller pressure relief hole is also provided on the top of the earphone.

The sound mouth of the earphone is covered by a fine dust-proof net to prevent foreign objects from entering the sound cavity.

After actual measurement, the overall weight of the Nokia E3101 true wireless earphone is about 34.1g, which is very small and light.

A single earphone weighs about 3.5g and is light and comfortable to wear.

Use a portable power tester to perform a wired charging test on the Nokia E3101 true wireless headset. The input power is about 1.5W.

|2. Nokia E3101 true wireless earphones teardown

After unpacking, we learned about the overall design of this product. Let’s enter the dismantling part below to take a look at the internal structure of this product.

Charging case teardown

Pry open the charging case and take out the charging cockpit.

On the front of the charging cockpit, the battery unit is located in the middle position for protection. The motherboard is fixed to the bottom of the cockpit by screws.

The back of the charging cockpit.

The main board unit at the bottom of the cockpit is fixed by positioning posts and screws, and the charging interface is welded on the main board.

Remove the screws and take off the motherboard.

There are three magnets at the bottom of the cockpit, two rounds are used to absorb the earphones, and the squares are used to absorb the charging case.

The front of the main circuit in the charging case.

On the back of the main circuit in the charging case, there is a double-sided tape to fix the battery on the back of the motherboard.

The battery unit is connected to the motherboard through the socket.

Lithium-ion polymer soft pack battery model ST 901530, rated voltage: 3.7V, rated capacity: 350mAh/1.3Wh.

The battery is equipped with a circuit protection board, which is responsible for the protection functions of the battery such as overcharge, overdischarge, and overcurrent.

The circuit on the front of the motherboard.

The circuit on the back of the motherboard.

The Hall element FPC cable is soldered on the motherboard.

The Hall element of HEAV with silk-screen printing. Charging case The magnetic field changes when the lid is opened and closed will be sensed by the Hall element, and the charging case will be notified that the MCU and headset are paired or disconnected with the connected device.

There are a total of four LED indicators, which are used to feedback the remaining battery power.

Pogo Pin for charging earphones.

Function buttons on the motherboard.

Type-C charging interface female socket.

Injoinic IP5516 charging case management SoC, integrating MCU, boost converter, lithium battery charging management, battery power indicator, 5V one-way communication and other functions, provides a complete power solution for the TWS bluetooth headset charging bin.

IP5516 supports 300mA synchronous boost output, 500mA linear charging, adaptive input current, supports high-voltage platform battery, built-in ADC to calculate battery power, supports 1-4 LEDs or 5-6pin 188 digital tube power display. The high integration and rich functions of IP5516 enable it to require very few peripheral components during application, and effectively reduce the size of the overall solution and reduce the BOM cost.

According to 52audio, TWS headset charging cases of Edifier, JLab, Hiby, Baseus, Pioneer, PIHEN and other brands have adopted Injoinic power management solutions.

2R2 boost inductor, used to boost the battery output to charge the earphones.

The main board is connected to the battery wire socket.

The input uses ETAsolutions ETA7008 low-side overvoltage protection chip for input overvoltage protection, ETA7008 withstand voltage 36V, built-in 34mΩ NMOS power switch, protection voltage and opening speed can be adjusted.

ETAsolutions ETA7008 details.

Headset teardown

Pry open the earphone cavity along the clamping line, and connect the speaker and battery to the main board through wires.

On the front of the speaker, the diaphragm is covered with a layer of wool fiber.

On the back of the speaker, there is a tuning hole around it, which is protected by a dust-proof net.

After actual measurement, the speaker size is about 13mm, which is consistent with the official publicity.

The internal structure of the front cavity of the earphone, the pressure relief hole is covered by a fine dust-proof net.

The inside of the pressure relief hole on the top of the earphone is also covered by a fine dust-proof net.

Magnet used to attract the charging cockpit.

The front of the earphone soft pack battery is wrapped with insulating tape.

The battery is provided with a protective plate.

The soft pack battery and charging case are from the same manufacturer, model ST 501012, rated voltage: 3.7V, capacity: 0.15Wh.

The integrated lithium battery protection IC of silk screen G60.

Pry open the back panel of the earphone handle.

The inner side of the back plate is provided with a conductive sponge for touch operation.

Take out the motherboard and print the Nokia-E3101 model on the motherboard.

The opening of the call microphone at the bottom of the earphone handle is also provided with a dust-proof net.

The circuit on the front of the motherboard.

The circuit on the back of the motherboard.

Cylindrical contact used to connect the charging case to charge the earphone.

Laser carving G133 1ZQC MEMS microphone is used for voice call pickup.

The crystal oscillator of the laser carving YL240 provides the clock for the bluetooth chip.

Ceramic bluetooth antenna for bluetooth signal transmission.

JL AD6973D4 bluetooth audio SoC, built-in 32-bit DSP, supports AAC, SBC decoding, supports neural network noise suppression and echo cancellation, and supports multi-band equalizer. Support single/dual microphone noise reduction, support two-way analog microphone amplification, built-in microphone bias. Adopt QFN20-3*3 package.

Details of JL AD6973D.

A black sponge is arranged around the LED indicator to prevent light leakage.

The left side of the indicator light is a metal contact connecting the conductive sponge, and the right side is a touch detection IC with a silk screen 8323QK.

Nokia E3101 earphones

All components of the Nokia E3101 true wireless earphones.

|3. Summary

The Nokia E3101 true wireless headset is a product with a lightweight design. In terms of appearance, both the charging case and the volume of the headset are very small and light. With the ergonomic handle-shaped semi-in-ear earphone design, it provides a more comfortable, lighter and more stable wearing experience. The charging case has four indicator lights and the blind spot of the headset touch area is raised, which enhances the actual user experience.

In terms of internal circuits, the built-in lithium-ion battery has a capacity of 350mAh, the charging case uses a Type-C interface input power supply, and the input terminal is used by ETAsolutions ETA7008 low-side overvoltage protection chip for input overvoltage protection. The main control chip is the INJOINIC IP5516 charging case management SoC. A single chip integrates MCU, boost converter, lithium battery charging management, battery power indicator and other functions. Only a few peripheral devices are required for application, and the overall solution is effectively reduced. The size of it reduces the BOM cost.

The Nokia E3101 headset uses a 13mm large-size dynamic driver inside, and the 0.15Wh soft pack battery is equipped with an integrated lithium battery protection IC with silk screen G60. On the motherboard, the main control chip uses JL bluetooth audio SoC, supports bluetooth 5.1, supports neural network noise suppression and echo cancellation. The touch detection IC of screen printing 8323QK is used for touch operation. And a MEMS microphone for voice call functions.

Source: 52audio


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