At the end of 21, at the launch of the Xiaomi Mi 12, not only released the mobile phone, but also released a smart watch Xiaomi Watch S1, according to the official description of the S1 model in the S, taken from the abbreviation of "Super", representing powerful. It also represents that the S1 is a product facing the high-end market. Is that what the name suggests?
As with the above configuration information, S1 adopts a new design in appearance, sapphire glass material plus 316L austenitic stainless steel frame, the watch is thin and light, and the appearance is very high. Inside, we have to look at the teardown below.
dismantle
The Xiaomi Mi Watch S1 features a detachable strap that can be retrieved by pressing the clip inward. The back cover of the watch is fixed by four screws, it should be noted that the BTB interface on the back cover is fixed to the motherboard by screws, and the interface needs to be disconnected first before removing the back cover. There is also a black rubber ring around the back of the case to make it waterproof.
Put the case part aside for the time being, first process the device on the back cover, which integrates the heart rate module, speaker, vibrator, sensor flex board, capacitive flex board and wireless charging coil, and remove it in turn. The black heart rate sensor cover is secured by snaps; the sensor flex board, capacitive flex board, and wireless charging coil are fixed to the heart rate sensor board by solder joints; the vibrator and speaker are fixed by glue, and a waterproof rubber ring is covered around the speaker.
There is a magnet on each side of the back cover for adsorbing the charger, and the microphone and pressure relief hole are also designed with a waterproof film. Remove the sensor flex board, capacitive flex board, and wireless charging coil. The microphone on the sensor's flex board is dispensed, and the barometer is also waterproof with a black rubber ring.
The rear cover has been disassembled and transferred to the case section, where the motherboard, battery, screen, NFC coil and side key flex board are all integrated in the case section. The NFC coil is glued to the screen module. Unscrew the screw to remove the entire motherboard module, and the battery and side key flex board are fixed by glue and the motherboard.
analyse
Among the main devices of the Xiaomi Watch S1, the battery is a 470mAh lithium polymer battery from Sunwoda. On the screen was selected the Visionox 1.43-inch, resolution 466x466 AMOLED screen.
▼Then let's look at the main ICs on the motherboard:
1: BES-BES2500BP-Bluetooth Audio SOC
2：Toshiba- -4GB Flash
3：Dialog- -WiFi SOC
4: SGMICRO--AMOLED display power chip
5: NXP--NFC control chip
6: Broadcom--GNSS chip
7: Dialog- -DC-Battery management chip
8: CellWise- - Fuel gauge chip
9: Bosch-gyroscope + accelerometer
10: AKM- - Electronic compass
Xiaomi Watch S1 uses BES2500BP Bluetooth audio SOC, in the past disassembled devices, BSE2500 series has appeared many times in one plus headphones, Huawei headphones, OPPO headphones. It was also the first time it appeared in the eWisetech database in a watch.
summary
Xiaomi Watch S1 uses a total of 13 screws, the internal structure is clear, sapphire glass mirror + stainless steel frame greatly improves the fall resistance and scratch resistance of the whole machine. The watch is waterproof and is waterproof on the screen, back cover, speakers, barometer, microphone, pressure relief hole, buttons, etc. All BTB connectors are protected by a protective cover. The NFC coil is fixed on the back of the screen, which is more space-saving, which is also the current mainstream solution of watches.