An intelligent power board for the smôl ecosystem that boosts the voltage from one or two AAA or AA cells up to 3.3V. Features a TPS61200 boost regulator and an ATtiny43U microcontroller that enables deep sleep for the entire smôl stack — drawing just 12 µA in sleep mode.

The processor board can instruct the power board to put the entire stack into deep sleep for intervals ranging from tens of milliseconds to several days, making battery life measurable in months rather than days.

Key Features

• TPS61200 Boost Regulator – Steps up 1–3 V input to 3.3 V output
• ATtiny43U Microcontroller – Manages intelligent sleep/wake cycles (4 KB Flash, 256 B SRAM, 64 B EEPROM)
• 12 µA Deep Sleep Current – Ultra-low power consumption in power-down mode
• I²C Interface – Default address 0x50
• smôl FPC Interconnect – 16-way 0.5 mm pitch flexible printed circuit stacking

Specifications

• Output Current (max) – ~550 mA at V_IN = 1.5 V; ~1500 mA at V_IN = 3.0 V
• Regulator Quiescent Current – 55 µA
• Dimensions – 40.6 × 10.7 × 7.4 mm (L × W × H max)
• Weight – 1.6 g
• PCB Thickness – 0.8 mm

Resources

• Power Board AAA Hookup Guide
• smôl Hookup Guide
• Arduino Library (with examples)
• Hardware Design Files (GitHub)
• Schematic
• TPS61200 Datasheet
• ATtiny43U Datasheet