Dac student design competition
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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

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DAC Student Design Competition

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Dac student design competition

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


Dac student design competition

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


Custom technology

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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