Huawei M-Pencil stylus is disassembled to see which domestic chips are used?
Latest update time：2023-01-10
Reads：
M-Pencil is Huawei's first-generation stylus, which supports wireless charging and 4096 levels of pressure sensitivity. The shell is made of plastic with a metallic texture, and the pen tip is replaceable. Some tablets support magnetic wireless charging, so you can directly attach the M-Pencil to the edge of the tablet to charge. Devices that do not support magnetic wireless charging need to be equipped with a Huawei type-c wireless charger as shown below.
After disassembling the M-Pencil, I found that it is actually very easy to disassemble, and it is impossible to disassemble it without damage, because the cap part is glued. The ideal way to disassemble it is to make a ring in front of the letter H of HUAWEI. It's relatively easy to cut and put back together. But irreversible lossy disassembly is more enjoyable.
Just disconnect the adhesion between the pen core and the shell at the cap part to take out the pen core directly. This side is its wireless charging part, the middle is its wireless charging coil, and there is a magnet on each side for adsorption and positioning.
Below are its 2 magnets.
The main circuits are concentrated on the other side of the PCB.
A domestically produced Gaoyun GW1NZ-LV1 FPGA.
There is also an NXP LPC802 Cortex-M0+ microcontroller.
A
domestic Goodix Technology GT9685
chip
is quite magical. It is attached to an FPCB, and then the FPCB is welded to the motherboard.
According to the data, it is a 5-point touch chip.
There is also a CSP packaged chip model called DT33TS. This chip is said to be ST's wireless charging chip on a certain website. However, no information can be found on ST's official website. It may be a customized product.
There is a pressure sensing chip in the pen dust. It has 4 pads and is connected to the motherboard through 4 metal sheets. Many touch pens will later have the problem that they can be connected but have no pressure sensing. Basically, these 4 pads are soldered. As a result, sometimes you have to press hard to get it to work properly.
The back of the removed pressure sensor is shown in the figure.
There is a small dot in the middle of a square chip on the front. I have not found any information and am not sure what the reason is.
Capacitive touch detection is also integrated on the pen tip. From the side, there are three metal strips welded directly to the motherboard, and the colors are white, blue, and black.
There are 7 pads on the right side of the motherboard, 3 on the left are pads corresponding to the three colored metal strips for touch detection, and 4 on the right are soldered metal sheets and connected to the pressure sensor.
Touch detection corresponds to 3 components respectively. They are nested together one by one. I don’t know what the principle is.
The lower metal component is placed in the pen tip and should be used with the pressure sensor to detect pressure. There may be something like a spring inside, but it flew away the moment I took it apart.
Finally, there is this pen-shaped lithium battery, a trademark of Huawei.
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