"The second generation of Apple Wireless Headset airpods can be called a miracle in the field of a new generation of miniaturized devices. All functions of Bluetooth headset are added to such a light and small body, and the H1 smart chip developed exclusively is introduced. Most importantly, support for wireless charging has been added to the second generation products, and the appearance and volume of the charging box have not changed significantly.
The most intuitive way to understand it is to take a look at its internal structure through disassembly. Let's take a look at how its charging box supports wireless charging function and what's going on with the rumor that "an iPhone 4 is integrated" in the headset.
1、 Apple airpods second generation unpacking
In terms of earphone packaging box, it seems that there is no change compared with the previous generation. It is still a pure white background color. In the middle are two airpods second-generation earphone bodies with earphone handles. In addition, there is no brand model and other information.
The back of the package is the way the headset is placed in the charging box. When charging, half of the headset is exposed, and the indicator light on the front of the charging box is on. At the bottom left is the product name airpods, and below is the "attached wireless charging box" in English, French, German, Italian, Spanish, Japanese and other languages. This wireless charging box is one of the highlights of the second generation upgrade of this headset.
On the other side of the box is the Chinese label of this product, indicating that it is a Guohang Apple product. Trade name: wireless headset, model: a2031, a2032 trade name: headset box, mobile power supply model: a1938, input: 5.2v 2.4a, output: 5V 1a, manufacturer: This product is authorized by apple, USA, address: Building 6, block C, No. 88, Maji Road, China (Shanghai) free trade test zone, Made in China dealer: Apple Computer Trading (Shanghai) Co., Ltd. is compatible with IOS devices, apple watch or Mac with the latest version of software installed. Applicable to airpower charging pillow and Qi certified charger.
Next, unpack the package, including the earphone charging box containing the second generation of airpods, a lightning charging cable, several instructions, etc.
Open the earphone charging box and place the two earphones vertically in the charging box. The edge of the groove dug for the earphone bin on each side is almost filled with earphones. The gap is very small, which can reduce the shaking and collision of earphones in the process of carrying and bring longer service life.
We use chargerlab power-z kt001 for wired charging test, and the charging current is 214.9ma.
We use chargerlab power-z kt001 for wireless charging test, and the charging current is 305.2ma.
2、 Disassembly of Apple's airpods second generation headset charging box
Now start to disassemble the headphone charging box. First, remove the internal frame from side C, that is, the entrance of the headphone bin.
Light guide of work indicator light.
After removing the earphone bin, a large part of the space is left inside. The sleeve structure in the box, the main board and other components are fixed on the plastic inner cylinder. The inner cylinder is fixed with the shell with glue. It can be seen that the earphone bin, battery and motherboard each occupy nearly 1 / 3 of the space in the charging box.
Remove the battery with Chinese logo, model a1596, made in China, charging limit voltage 4.35vdc, made by Xinpu Technology Co., Ltd.
The built-in battery model of the headset charging box is fg9837525b, and the battery capacity is 1.54wh.
There is a black circuit protection board on the battery, with the number 63900687 bzaa8337w on it.
The main board in the battery box is connected with the battery bin. A 90 degree metal sheet is fixed with screws on the cable socket.
After removing the screws, separate the headphone compartment from the motherboard.
Pry the heating shell out of the inner cylinder, so that the internal structural parts of the charging box can be seen at a glance.
Let's take a look at the wireless charging part. The coil responsible for wireless charging and the key module on the back of the headset charging box are fixed on the inner side behind the fuselage.
When the two modules are removed, the wireless charging coil and the pairing button in the middle can be seen on this side.
There are four metal contact areas behind one of the white plastic parts. The airpods generation key module has only two rectangular gold contacts, and the airpods generation 2 key module adds two wireless coil contacts.
Remove this button. Below is a micro key.
There is a gasket between the middle frame and the shell. The earphone bin extends below a column. The charging contact at the lowest part is an independent module. The cable is separated from the main board into two parts. One part is connected to the charging contact and the other part is connected to the indicator light / Hall sensor.
Three LED indicators indicate different colors.
This end is a Hall element to detect the opening and closing state of the box cover.
The bottom end of the earphone bin is an independent module, and the cable is adhered to its bottom.
There are four copper contacts in total. It can be seen that the contact area with the headset is large, which can ensure the continuous and stable charging.
The two magnets will adsorb the earphone and assist in positioning when the earphone is about to be put into the earphone charging box.
Next, take a look at the inner cylinder of the earphone motherboard. The motherboard is fixed on the front. There are four elastic metal contacts on the motherboard, which are the most conspicuous.
On the other side, there is basically a plastic frame (the battery has been removed in advance) and a lightning interface board is fixed with screws.
After removing the lightning interface board, the lower lightning interface cable is also fixed on the motherboard with screws.
Close up of lightning interface.
On the back is an 88zda numbered inkjet.
The motherboard is covered with soft and transparent waterproof glue, which can effectively increase the mechanical strength of these micro components and achieve the purpose of protection.
Next, after removing the motherboard, there is basically only a plastic frame left in the middle.
Close up of the front of the main board of the headset charging box.
Close up on the back of the main board of the earphone charging box, there are many test points and two cable outlets. The upper left is the battery connection socket, and the lower is the lightning interface connection socket.
Four metal contacts on the back of the motherboard are used to contact the wireless charging coil and key module.
Eight NPO capacitors are arranged next to the contact.
NXP s10a38 n94s25 USB logic and charging IC charging chip.
IC of silk screen 3D F7.
IC of silk screen printing DP BM.
IC of silk screen CET.
Silk screen 3441 tbsn IC.
Screen printed t5ax JKD IC.
Silk screen SDG IC.
Ti Texas Instruments bq25116a charging management chip.
The IC of l476mgy6 is actually the MCU model stm32l476mgy6 – arm cortex-m4 microcontroller of St STMicroelectronics.
IC of silk screen printing 7Ag.
Silk screen printing 86mi OEH IC.
Screen printed HTL La IC.
IC of silk screen 86e1 1a8.
Broadcom bcm59356 wireless charging management IC.
Disassembly list of headset charging box.
3、 Disassembly of Apple's airpods second generation headphones
According to Apple's official page, the second generation of airpods knows when you speak. Here is the voice acceleration sensor, which can recognize when you are talking, and cooperate with a pair of microphones using beamforming technology to filter out external noise and clearly lock your voice.
Also, airpods II knows when you start listening. The optical sensor and motion acceleration sensor cooperate tacitly, which can automatically control various audio experiences, such as activating the microphone for voice and using Siri, and allowing airpods to be played in one ear.
In addition, it's up to you to wear only one headset or use both headphones at the same time. When listening to music, tap airpods twice to start playing or jump forward to the next track.
Cmiit ID and product model are printed on the bottom of the two earphone cavities. They are made in China. It seems that the clamping line is somewhat obvious.
The charging contacts of the headset are cleverly arranged at the bottom. They are two semicircular metal contacts separated by a plastic fault in the middle. In the middle is a call microphone with a metal mesh to prevent dust.
Noise reduction microphone hole.
An acceleration sensor on the outside of the headset.
Here is a large inverted hole with dust screen.
In the earphone part, the long strip is the air pressure balance hole, and the dot below is the sensor.
There is a metal dust net at the sound outlet.
Next, we began to disassemble the earphone. Our experienced disassembly specialist cut it vertically from the side this time.
In this way, the back cover is removed to visually see the interior.
The internal structure of the two earphones is basically the same.
The charging contact is located at the bottom, and the dust net of the microphone is in the middle.
The metal contacts behind can be seen on the back.
On the back of the cut earphone shell, there is a sensor window on the inner wall.
The L-shaped inverted hole is an independent plastic module.
Removing the earphone of the whole shell, you can intuitively see the compact stacking structure of the hardware.
The earphone battery is covered with the earphone antenna.
The bottom microphone is covered with a white translucent dust net.
Remove the upper layer, and the lower layer is the solder joint of the negative row of the battery.
Battery positive wire solder joint.
The call microphone at the bottom is protected by white glue.
Next, start to look at the components on the headset. The corresponding position of the noise reduction microphone hole behind the headset is wrapped with a layer of black glue.
Lift off the black surface, behind which is also a MEMS patch silicon wheat.
The independent phase inversion hole module also carries the noise reduction microphone.
The other side of the module.
The second generation communication antenna of airpods is half wrapped on the surface of the battery.
There is a coaxial socket at the end of the back of the antenna.
Close up of coaxial socket.
The acceleration sensor on the back of the headset is integrated on the flat cable.
Remove the earphone cover, there is a layer of gray protective shell below, and the gold part also acts as the function of sensor antenna.
The sensor on the inside of the earphone cover is provided with a window and a dust net.
The antenna of the sensor is printed on this plastic cover. There is a sensor in the middle of the plastic cover and a sound hole on the other side.
After removing the sensor, the following is the complete antenna area.
The earphone has three PCBs: large, medium and small. The black tape on one side of the battery still belongs to the wiring area, extending from the earphone motherboard to the end microphone.
The speaker is firmly fixed on the other side of the motherboard.
The battery is compared with a dime.
QR code is at the left end of the battery and + goky93mwha1604 is at the right, so the battery capacity is 93mwh.
There is no information such as earphone parameters printed on the T iron on the back of the speaker.
The speaker structure is a moving coil speaker, which adopts metal ball top and plastic diaphragm. Combined with their respective advantages, it can play well in high and low frequency.
A very small PCB sub board connected to the end of the battery cable is covered with very hard resin glue.
The other side of the small PCB sub board.
On the left is the main PCB, and on the right is the medium PCB sub board.
The other side of these two PCBs.
There are no components on the back of the main PCB, and these many test points are evenly distributed.
Bone conduction sensor.
Screen printed KNv La IC.
Apple 338s00420, presumably a low-power stereo audio processing chip.
IC of silk screen printing BW A09.
Silk screen 25sl 128A 1829 IC.
Silk screen + IC of AAF 834.
Apple 343s00290 chip, presumably this is apple H1. It is understood that the chip integrates cypress SOC, Maxim audio codec, Bosch ma280 accelerometer, St triaxial accelerometer, St calibrator, Ti Texas Instruments data converter and other components. In terms of Bluetooth, it supports Bluetooth 5.0, with lower power consumption than the previous generation.
In order to make you more intuitively feel how small and integrated this chip is, let's mark the size.
The apple H1 chip is the size of a dime.
Disassemble the family photo.
Disassembly summary
In terms of charging box, the appearance of this second-generation earphone charging box of airpods has not changed much compared with the previous generation products. The wireless charging function is added in a similar volume, which can greatly improve the user experience without affecting the user's use habits.
In terms of headphones, the biggest highlight is the new H1 chip of apple. It integrates so many components such as SOC, audio decoder, various sensors and Bluetooth functions. It can be said that it has a high degree of integration unprecedented and unprecedented.
Not much has been changed in terms of headphones and speakers, that is, the sound style is still the same as apple headphones, and it can also allow users to replace the new headphones without changing their habits., Read the full text“
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