smôl Power Board LiPo

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Our RedBoards are great. But don't they sometimes seem a little BIG?!

Enter smôl, a new range of boards which are both small in size and small on current draw. It's a smôl world!

The smôl Power Board LiPo is an intelligent power board for the smôl ecosystem. You would expect this board to have an MCP73831 Li-Ion and Li-Polymer charger on it, and indeed it does. You would also expect this board to have a MAX17048 I2C fuel gauge on it, and indeed it does. But you probably wouldn't expect it to have an AVR ATtiny841 microcontroller on it. So why have we included one?

This is an intelligent power board for smôl. The power board takes control of the 3.3V power for the whole smôl stack. The processor board can then instruct the power board to put the entire smôl stack into deep sleep for a pre-defined interval. Sleep intervals of 10's of milliseconds to several days are possible. In deep sleep, the only device left powered is the ATtiny841 and that reduces the current draw to 6µA. Yes, you read that right, 6 microamps! smôl makes it possible for your battery life to be measured in months not days! We used the fantastic Otii Arc Power Analyzer to help us reduce the sleep current as much as possible.

Our smôl Power Board Arduino Library has examples to get you started.

smôl is an ecosystem of miniature processor boards, peripheral boards, power boards and accessories. Designed to be both physically small and to have the smallest possible current draw, smôl is the perfect choice for applications like wildlife tracking or discrete long-term monitoring. smôl boards are designed to stack one on top of the other, using 16-way 0.5mm-pitch Flexible Printed Circuits (FPCs) to provide the interconnect from one board to the next. Looking for a really compact solution for your next project? This is it!

We will be adding new smôl boards over the coming months. Don't see the board you need for your application? Reach out to us via the SparkX Forum and tell us which board(s) we should add next!

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.

Li-Ion / Li-Polymer Charger:

  • MCP73831
    • Charge current: 100mA (when USB power is connected)

Battery Fuel Gauge:

  • MAX17048

On-Board Microcontroller:

  • ATtiny841 8-bit AVR Microcontroller
    • 8KBytes Flash
    • 512Bytes EEPROM
    • 512Bytes SRAM

Power Regulation:

  • smôl 3.3V:
    • AP2112K-3.3V
    • IOUT (max): 600mA
    • IQ: 55µA
  • ATtiny841 3.3V:
    • STLQ015-3.3V
    • IOUT (max): 150mA
    • IQ: 1.4µA

Sleep Current Draw:

  • 6µA (with ATtiny841 in Power-Down Mode) (measured by Otii Arc)

smôl Specifics:

  • Interface: I2C
    • ATtiny841 Default Address: 0x50
    • MAX17048 Fuel Gauge Address: 0x36
    • The power board pulls PROC_PWR_EN low to disable the regulator on the processor board


  • Length: 1.60" (40.6mm)
  • Width: 0.42" (10.7mm)
  • Height: 0.29" (7.4mm) max.
  • Weight: 1.4g (0.05oz)
  • PCB thickness: 0.8mm

smôl Power Board LiPo Documentation:

Li-Ion / Li-Polymer Charger:

Battery Fuel Gauge:


smôl Documentation:

smôl Power Board LiPo Product Help and Resources

smôl Power Board LiPo Hookup Guide

October 21, 2021

Small in size, small on current draw. It's a smôl world! This guide will get you up and running with the smôl Power Board LiPo.

smôl Hookup Guide

October 19, 2021

Small in size, small on current draw. It's a smôl world! This guide will get you up and running with the smôl ecosystem.

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Competent - You might need to break out the power tools. Nothing beyond a power drill or rotary tool should be required, but you might have a hard time with just a screwdriver and hammer. Cutting holes into plastic or metal might be required.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

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