Smart Watches and Fitness Trackers

Engineering selection notes

Low power

Review current and timing in run, standby, shutdown and wake-up states. Calculate average power using the actual duty cycle.

Size

Check package, pinout and layout against PCB constraints, including decoupling, routing and manufacturability.

Time reference

Define accuracy and resynchronization intervals, then review reference, temperature error and power-loss behavior in the full timekeeping chain.

From requirements to validation

1. Record frequency, stability, interface, supply, package and temperature requirements.
2. Filter local catalog models and download the manufacturer datasheet to verify full test conditions.
3. Confirm configuration, qualification and lead time for the ordering code, then validate schematic, layout and prototype.