Zephyr Power Management for Wearable Devices
summary
A working smartwatch demo on NXP RT500 runs under Zephyr’s PM subsystem and shows concrete knobs: device-tree PM nodes and kconfig flags drive tickless deep sleep, the PCN9420 PMIC exposes four regulator states, and a PVT sensor enables DVFS via PVT sensor. Measured results: enabling PM cuts analog-face power ~95%, GPU offload (LVGL + 2D) saves ~14%, using SRAM instead of external flash saves ~8%, and disabling unused SRAM partitions saves ~18%. Demo firmware and code live on GitHub and the video/demo operate as described.
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chapters (12)
- 0:00Zephyr power management
- 1:49Smartwatch demo overview
- 6:27Live smartwatch demo
- 9:18Power optimization techniques
- 13:18RT500 MCU power management
- 15:45Power management deep dive
- 17:12Power in active/idle modes
- 19:46Dynamic voltage scaling
- 21:51Display power optimization
- 25:02Memory optimization for battery
- 30:05Power savings summary
- 32:16Q&A
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