Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On

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Product Code: 91519
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Product Description
  • Comes assembled and tested
  • Uses the 5V input via Micro-B USB connector on the Pro Trinket
  • For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
  • 100mA charge current, adjustable to 500mA by soldering a jumper closed
$7.00
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Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On info

If you have a Pro Trinket you probably know it's the perfect little size for a portable project. Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On makes it really easy to do. Instead of wiring 2 or 3 boards together to make a charging system, this little PCB sits on top of the Pro Trinket and allows a LiPoly/LiIon battery to plug in. When the Pro Trinket USB port is powered, the battery is recharged automatically. Unplug the USB port and the Pro Trinket will switch over to the rechargeable battery.

Ideally, Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On is for use with the 3.3V Pro Trinket, so that the battery voltage (3.7V-4.2V) will get regulated down to 3.3V on the Pro Trinket board. However, many times, you can run a 5V Pro Trinket + accessories off of the ~4V from the LiPoly battery with no problem. (Technically its overclocking but we've never seen that affect the Pro Trinket itself, AVRs are happy to overclock without complaint).

Solder Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On on with the extra long header so that it can still plug into a breadboard, or clip the long header leads short afterwards for a slim package. There are two LEDs - one red and one green. While charging, the red LED is lit. When the battery is fully charged and ready for use, the green LED turns on. Seriously, it could not get more easy.

If you want to add an On/Off switch, it is also really easy. The two 0.1" holes with a box around them are the battery output line. Carefully cut the trace between them with a hobby knife and replace with two wires from a switch or pushbutton.

Charging is performed in three stages: first a preconditioning charge, then a constant-current fast charge and finally a constant-voltage trickle charge to keep the battery topped-up. The charge current is 100mA by default, so it will work with any size battery and USB port. If you want you can easily change it over to 500mA mode by soldering closed the jumper on the bottom, for when you'll only be charging batteries with 500mAh size or larger.

Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On is for use with Adafruit LiPoly/LiIon batteries only. Other batteries may have different voltage, chemistry, polarity or pinout.

 

Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On - General Specifications

  • Comes assembled and tested
  • Uses the 5V input via Micro-B USB connector on the Pro Trinket
  • For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
  • 100mA charge current, adjustable to 500mA by soldering a jumper closed

 

Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On - Technical Specifications

  • Dimensions: 15mm x 17mm x 2mm
  • Height w/ JST: 7mm
  • Weight: 1.3g

 

Documents

MCP73831 Datasheet

 

References

Adafruit Web Sitehttps://www.adafruit.com/products/2124

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