A few Android Wear smartwatches have been released lately, and we decided to take a look inside the Moto 360 from Motorola. As usual with the small, water resistant devices we've been taking apart lately, the Moto 360 uses adhesives, flex PCB connectors, and other methods to keep the product compact, so some creativity is necessary to find your way inside. We took inspiration from iFixit's Moto 360 teardown but did not take care to be able to put it back together.
The Moto 360 comes in a round box, mimicing its round screen.
Inside the box is the watch, manual, and charger.
Inside the puck is the main PCB with a battery on the back, and a plastic frame containing the bluetooth antenna. The matte grey shape pictured above is a ferrous sticker that improves the charging efficiency of the Qi charging circuit underneath.
Removing the ferrous sticker ruins the Qi charging coil but reveals the back of the pulse oximetry sensor and cool flex PCB connector.
The chips on the main PCB are underneath a protective can. The flat part of the can came out easily but the frame was soldered to the board.
To remove the frame, we set up the board in a panavise and carefully heated it at a hot air rework station while tugging on the frame with tweezers. One side at a time the can lifted, revealng the rest of the chips!
The chips on the board we could identify:
- TMS320 - DSP
- AFE4490 - pulseOx AFE
- MxT112S - captouch controller
- ssd2848 - solomon systech MIPI graphics buffer
- 2SB28 D9QRM 512MB RAM - PoP above, Ti Processor underneath
- Toshiba 4B MMC flash
- WL1831 Ti WiLink - Wifi/BT/BTLE radio
- wm7132 - bottom port microphone
- wm7121 - top port microphone
- tps659120 PMU (dc/dc, linear, brownout, etc)
- TUSB1211 - USB PHY
- bq5105 - Qi LiPoly charger
- CS53L30 - Cirrus Logic CS53L30 Quad-Channel Microphone ADC
This was a fun and challenging teardown revealing some design and engineering behind this early-wave smartwatch.