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crwdns2936045:0crwdne2936045:0 crwdns2933505:0crwdne2933505:0 Jeff Suovanen

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[title] Explore the PCB
[* black] Now let's see what kinds of ICs are being used:
[* light_blue] Nordic [https://www.nordicsemi.com/eng/Products/ANT/nRF51422|nRF51422] low power RF SoC. Used for Bluetooth LE.
[* orange] Cypress [http://www.cypress.com/file/130051/download|CY8C20767]capacitive touch controller.
[* red] Maxim [https://www.maximintegrated.com/en/products/power/battery-management/MAX14676.html|14676B] wearable charge management IC.
- [* yellow] Assumed to be an ARM Cortex-M microcontroller. Freescale, the manufacturer, is no longer in business, as it was purchased by NXP recently - this makes it hard to look up the marking.
+ [* yellow] Freescale Kinetis KL26 Sub-Family Cortex-M0+ Based Microcontroller. Probably [http://cache.nxp.com/files/microcontrollers/doc/data_sheet/KL26P121M48SF4.pdf?fpsp=1&WT_TYPE=Data%20Sheets&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=pdf&WT_ASSET=Documentation&fileExt=.pdf|MKL26Z256VMP4] labeled as M26P8V.
[* black] There are all kinds of test points visible on the back. Garmin must do a pretty thorough QA.
[* black] Looking side-on, you can see that the flex circuitry is sandwiched between two sets of rigid PCB.