Adafruit LiPo Board for Trinket

  • Brand: Adafruit
  • Product Code: AF2124
  • Stock

    Warehouse Stock Status Location
    Centurion In Stock UR164
    Stellenbosch In Stock 634
  • R98.00 (price excl. VAT)


Adafruit LiPo Board for Trinket

This LiPoly backpack is great for the ItsyBitsy and Trinket boards. Instead of wiring 2 or 3 boards together to make a charging system, this little PCB sits on top of the PCB and allows a LiPoly/LiIon battery to plug in. When the Pro Trinket or ItsyBitsy USB port is powered, the battery is recharged automatically. Unplug the USB port and the microcontroller will switch over to the rechargeable battery.

AF2124-003

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

Solder the backpack 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.

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.

Quick Spec

  • 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
  • Dimensions: 15 x 17 x 2mm
  • Weight: 1.3g

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Tags: adafruit, lipo, board, trinket, itsybitsy, packback, psu, ups