Huawei WATCH GT 3 Sports Smartwatch Teardown

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Huawei released the HUAWEI WATCH GT 3 late last year. This GT 3 upgrades the hardware and software experience. Compared with the HUAWEI WATCH GT 2, the GT 3 has a larger screen-to-body ratio. Upgraded BES BES2500 series chips, adding blood sugar management, fall monitoring, body temperature detection, support for wireless charging and reverse charging of mobile phones. The eight-channel heart rate monitoring and dual-frequency five-star precise positioning have been upgraded, and the TruSport scientific exercise system has been independently developed to provide professional exercise evaluation and advice.

The appearance of the HUAWEI WATCH GT3 smartwatch continues the classic circular dial design of the GT series. The front is equipped with a 1.32-inch AMOLED screen, and the body uses a stainless steel front shell and a polymer fiber composite rear shell. The typical mode battery life of the 46mm dial version is 14 days, and the typical mode battery life of the 42mm version is 12 days.

Qucox has shared the HUAWEI WATCH GT 3 review with friends before. Next, let’s enter the teardown section of the watch and see what components have been upgraded in the watch.


|1. Huawei WATCH GT 3 Smartwatch Unboxing

The overall packaging of the HUAWEI WATCH GT3 is a minimalist design style in white tones. The product name “HUAWEI WATCH GT 3” is printed on the front of the outer package, and the dial size is 42mm, powered by HarmonyOS. The font is streamer and colorful, and you can see different colors when you change the angle under the light. Combined with the minimalist outer packaging, it creates a simple but not simple sense of luxury.

The box has a top and bottom cover design with a label on the back. Label information, product name: HUAWEI WATCH GT3; model number: MIL-B19; device name: smart watch; case type: black stainless steel case; wristband type: black fluororubber strap, quality inspection mark.

The base is a customized magnetic wireless charging base with an arc design to fit the bottom of the fuselage.

Information on the back of the base. HUAWEI WATCH wireless charging base. Model: CP8101; Input: 5V⎓2A; Huawei Terminal Co., Ltd.; Made in China; 10-year recycling logo.

Huawei WATCH GT 3

The watch dial uses a 3D curved screen, which will have a streamer-like effect under the light, bringing a better look and feel.

The strap of the watch is connected to the watch using a connecting shaft. The watch case is connected to the dial by screws.

Toggle the slider to remove the watch strap.

The word 20M is printed on the inside of the strap. If you want to replace the strap, remember to buy a strap with a width of 20mm.

The strap hoop, one of which is provided with a protrusion on the inside of the strap hoop for fixing the position of the strap.

Watch buckle, imprinted with “STAINLESS STELL E”. Unlike the smooth outer side of the clasp, the inner side of the clasp is matte, and the overall look has a high-quality texture.

The sensor module at the bottom of the watch passes through eight photoelectric sensors arranged in a ring under the Fresnel lens and two sets of light sources. The Fresnel lens can diffuse the light emitting area for better sensitivity.

A microphone pickup hole is set in the middle of the other side at the bottom of the case for voice pickup.

There are speakers at the bottom of the case for sound to come out.

The air pressure sensor hole of the watch.

There is a rotating crown and a function button on the right side of the watch.

The crown of the watch has the words “HUAWEI WATCH GT” on the crown.

When the watch sensor is working, the LED light on the bottom lights up green.

The bottom case of the watch is fixed to the middle frame of the watch with Torx screws.

The watch adopts the magnetic absorption wireless charging method. When charging, the dial will have a prompt message to prevent the adsorption of metal foreign objects and cause abnormal charging.

Use a portable power tester to test the wired charging of Huawei WATCH GT 3 smartwatch, the charging voltage is about 5.05V, the charging current is about 0.62A, and the input power is about 3.20W.


|2. Huawei WATCH GT 3 Charging Dock Teardown

After reading the appearance of the product, let’s enter the teardown link. First perform teardown of the charging dock.

Uncover the sticker on the charging base to see two screws hidden under the sticker.

Unscrew the screws to disassemble the bottom case of the charging base.

The wireless charging base is in the middle, attracting the magnet of the watch.

The motherboard in the wireless charging base uses a lot of white glue to fix components.

After cleaning the white glue, the motherboard circuit.

The resonant capacitor on the main board of the charging base, 0.3μF 63V is used for wireless charging of the watch.

Four MOS tubes form a full bridge for wireless charging and silkscreen SNA.

MOS tube, silk screen SNA.

The wireless charging main control chip on the main board of the charging base, model QP5601GQ. This wireless charging master is also used in Huawei’s multi-device smart wireless charging pad.

Take out the main board, there is a magnetic isolation plate of ferrite material between the main board and the coil.

The coil of the charging base is also fixed with a lot of white glue.


|3. Huawei WATCH GT 3 Smartwatch Teardown

Next, enter the teardown section of the watch.

Unscrew the screws that fix the screen and the middle frame of the watch, and remove the screen.

The watch screen is connected to the watch motherboard through the FPC cable and fixed with a metal spacer.

Remove the metal gasket that fixes the screen cable. The position of the gasket corresponding to the cable plug is covered with buffer foam.

Inside the bottom cover of the watch, the watch’s battery is installed on the back of the screen.

The speaker is connected to the reed via metal contacts.

The air pressure sensor is held in place using metal spacers.

The built-in linear motor of the watch has an air pressure balance hole below it.

The watch battery is connected to the watch motherboard using a BTB connector. And there are metal gaskets fixed.

Unscrew the metal gasket that fixes the BTB connector of the watch battery. There is conductive tape and cushioning cotton on the gasket.

Remove the watch battery, which is fixed in place with a lot of white glue.

battery information. Model: HB522025EFW, rated capacity: 292mAh, nominal voltage: 3.87V, charging limit voltage: 4.45V.

There is a protection circuit on the side of the battery.

On the back of the battery, there is also a cotton pad for shock resistance.

Uncover the battery label, the internal information of the battery, rated capacity: 1.13Wh, nominal voltage: 3.87V, from ATL. The battery has a stainless steel casing.

Uncover the rubber on the other side of the battery, there is no other information on the surface of the battery, there is an arc pressure relief groove.

The bottom case of the watch has an L-shaped motherboard and the circuit at the bottom of the case.

There is a waterproof gasket in the groove in the middle of the bezel.

Inside the crown of the watch, the front is a micro-motion button that senses the pressing of the crown.

There is a Hall sensor at the bottom of the crown, which is used to sense the rotation of the crown and realize the function of rotation adjustment.

The circuit on the bottom of the watch is connected to the L-shaped motherboard via the BTB connector.

Connect to the BTB connector of the watch screen.

Metal spacers for fixing the L-shaped motherboard.

Unscrew the L-shaped motherboard screws and remove the motherboard.

An FPC is connected to the L-shaped motherboard through a BTB, and there is also a shielding cover on the FPC soft board.

Remove the circuit from the L-shaped motherboard.

There is an IC under the metal shield, model 894B, and three external inductors are used to power the AMOLED screen.

On the back of the L-shaped motherboard, there are a lot of cushioning sponges on the back. Important components are provided with metal shields, and copper foils are provided on the metal shields to assist heat dissipation.

Remove the L-shaped motherboard shield.

Remove the shield on the back.

IC for NXP 110TB2G.

Renesas ‎P9415 Single-Chip Wireless Power Receiver for 30W Applications. The device can be configured to receive or transmit AC power signals via magnetic induction. When the device is configured as a wireless power transmitter, it uses an on-chip full-bridge/half-bridge inverter, PWM generator and modulator/demodulator for communication, and a microcontroller to generate the AC power signal to Drive external LC tank to Watthar. As a receiver, the P9415 receives an AC power signal from a wireless transmitter and converts it to a rectified output voltage, which can then be used to power a mobile device or power a charger input in a mobile application. ‎

‎The P9415 features multi-time programmable (MTP) non-volatile memory for easy updating of control firmware and device functionality. The P9415 receiver tolerates onboard LDO voltages up to 20V and has the ultra-accurate current sensing capability required for high power applications. Compatible with IDT’s existing P9382A 15V receiver, it offers an attractive upgrade option for faster charging times. ‎

‎The device includes overheating and robust overvoltage protection. Fault conditions related to power delivery are managed by the industry-leading 32-bit ARM® Cortex-M0® processor, providing a high level of programmability while consuming extremely low standby power. The processor can also control GPIOs to indicate operation and failure modes. The P9415 is housed in an ultra-small WLCSP-53 package. ‎

Silkscreen DB IC.

Silkscreen LE37’s highly linear LNA for low noise amplification.

Silkscreen E7 IC.

Dialog bluetooth wireless chip, the model is wrapped in glue and cannot be seen clearly.

A chip with scraped information.

BES BES2500L smart watch SoC integrates storage, audio and connectivity. Integrated BT5.2 dual-mode bluetooth, can support BLE data transmission, bluetooth calling and music playback functions. Built-in multi-core heterogeneous CPU, integrated 2MB SRAM. The ultra-low power sensor hub system makes the standby power consumption of the terminal lower.

ST LSM6DSOWTR 3-axis accelerometer & gyroscope for motion detection function.

ST 32U5A9BJ6Q’s MCU, Ultra Low Power, with FPU Arm Cortex-M33, with Trust Zone, MCU 160 MHz, with 2MB Flash‎.

HiSilicon Hi3861V100 is a highly integrated 2.4GHz SoC WiFi chip that integrates IEEE 802.11b/g/n baseband and RF circuits. The RF circuits include power amplifier PA, low noise amplifier LNA, RF balun, antenna switch and power management modules. It supports 20MHz standard bandwidth and 5MHz/10MHz narrow bandwidth, providing a maximum physical layer rate of 72.2Mbit/s.

Hi3861V100 WiFi baseband supports Orthogonal Frequency Division Multiplexing (OFDM) technology, and is backward compatible with Direct Sequence Spread Spectrum (DSSS) and Complementary Code Keying (CCK) technology, and supports various data rates of IEEE 802.11 b/g/n protocol . Hi3861V100 chip integrates high-performance 32bit microprocessor, hardware security engine and rich peripheral interfaces. up to 50MHz. The chip has built-in SRAM and Flash, which can run independently and support running programs on Flash. Hi3861V100 supports HUAWEI LiteOS and third-party components, and provides an open and easy-to-use development and debugging environment. The Hi3861V100 chip is suitable for the field of IoT smart terminals such as smart home appliances.

Circuit on the back of the watch screen.

Silkscreen “622 133 25E” IC.

Silkscreen 1553A IC.

A sensor that detects ambient light intensity.

The internal structure of the watch bottom case, there is a plastic cover just above the sensor.

Remove the plastic cover.

After removing the plastic cover, the circuit inside the watch bottom case.

The air pressure sensor is held in place using metal spacers.

Remove the sensor retainer.

The air pressure sensor of the watch.

The MEMS microphone of the laser engraved “113 TWM6” is used to provide pickup function for voice calls.

The watch has a built-in microphone waterproof and breathable structure.

The breathable structure of the watch to balance the air pressure is also fixed with a metal gasket.

Take out the sensor module, the bottom case of the watch has a Fresnel lens structure. The black coil surrounding the lens is the wireless charging coil.

Take out the sensor circuit, a total of two layers. The lower layer is the wireless charging receiving coil, and the upper layer is the sensor assembly.

Sensor module, with 8 sensors to detect human heartbeat and so on.

Silkscreen “000APD” IC.

There is cushioning foam on the inside of the speaker fixing plate.

On the back of the speaker, silkscreen information “GTK-SBS 18E11”.

All components of HUAWEI WATCH GT 3 smart watch.


Summary:

HUAWEI WATCH GT3 smartwatch adopts a classic circular dial design in appearance. The front is equipped with a 1.32-inch AMOLED retina screen, and the body uses a stainless steel front shell and a polymer fiber composite rear shell.

In terms of circuit, the watch battery comes from ATL with a rated capacity of 292mAh, providing the watch with a battery life of up to 12 days. Wireless charging uses the Renesas ‎P9415 single-chip wireless power receiver for 30W applications, the device can be configured to receive or transmit AC power signals via magnetic induction, allowing easy updating of control firmware and device functionality.

In terms of wireless connection, the watch uses Huawei’s Hisilicon Hi3861V100 highly integrated 2.4GHz SoC WiFi chip, integrated IEEE 802.11b/g/n baseband and RF circuit, RF circuit includes power amplifier PA, low noise amplifier LNA, RF balun, antenna Switches and power management modules. It supports 20MHz standard bandwidth and 5MHz/10MHz narrow bandwidth, provides a maximum physical layer rate of 72.2Mbit/s, and provides super stability for the wireless connection of the watch.

HUAWEI WATCH GT3 smartwatch SoC adopts BES BES2500L, which integrates storage, audio and connection. Integrated BT5.2 dual-mode bluetooth, can support BLE data transmission, bluetooth calling and music playback functions. Built-in multi-core heterogeneous CPU, integrated 2MB SRAM.

Source: 52audio


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