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DAC Student Design Competition

The PicoCube is a compact 1 cm³ sensor node designed for energy harvesting applications, excelling in low-power radio communication with 10 kbps speed and 10 m range at 0 dBm. Featuring innovative design elements like stacked PCBs and specific power management ICs with high efficiency, the PicoCube employs a custom transmitter with FBAR technology. It integrates multiple power switches, linear regulators, and SPI interfaces for robust performance. This project demonstrates cutting-edge technology suitable for student design competitions.

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DAC Student Design Competition

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  1. 15mah NiMH 1.0 - 1.4v charge pump Shaker < 200mv bias radio PA power enable analog switch power switches linear regulator shunt reg. Radio digital power (GPIO pin) 2.0 – 2.8v 1.0v 0.65v SPI pwr on/off SPI VDD TPMS Sensor SPI serial IF MSP430 uC level shifters PA pwr on/off Tx VDD radio Wakeup SPI serial IF SPI serial IF JTAG external IF Tx data Tx data RF Sensor/Digital Interface DAC Student Design Competition “Picocube: A 1cm3 Sensor Node Powered by Harvested Energy” Yuen-Hui Chee, Mike Koplow, Michael Mark, Nathan Pletcher, Mike Seeman, Fred Burghardt, Dan Steingart, Jan Rabaey, Paul Wright, Seth Sanders

  2. Cube Anatomy on a dime radio COB die • Stacked PCBs • 1cm square switch/power board top/bottom sensor board #1 top/bottom storage board top/blank bottom radio board top/bottom sensor board #2 top/bottom uC board top/bottom

  3. Custom PicoCube Transmitter w/ FBAR 10 kbps, 10 m range at 0 dBm Supports FSK modulation, but useful for OOK Custom 200Ω antenna, matching PA Power Management IC 2 switched-capacitor converters (0.7V, 2.1V) 84% efficient Synchronous Rectifier 88% efficient from shaker Ultra-low-power references and other circuitry Custom Technology

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