Power Pins

  • VIN - The chip can safely run from 3-5VDC. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V
  • GND - common ground for power and logic
The LC709203F is powered by the connected battery, not by VIN or the STEMMA/QT connector. If no battery is plugged in, or the battery is too low, the LC709203F will not respond to I2C scans or commands.

I2C Logic Pins

  • SCL - This is the I2C clock pin SCL, connect to your microcontroller's I2C clock line. There's a 10K pullup on this pin.
  • SDI - This is the I2C data pin SDA, connect to your microcontroller's I2C data line. There's a 10K pullup on this pin.
  • STEMMA QT - These connectors allow you to connect to dev boards with STEMMA QT connectors or to other things with various associated accessories

JST Ports

Theres are two JST ports, they are equivalent. Connect the battery to either one, then the load/charger to the other. Watch out for battery polarity if not using an Adafruit battery!

The two ports simply connect together, and to the battery. You can use/charge the battery while connected by having the battery on one port, and then connecting a charger/project to the other

Other Pins

  • INT - Interrupt signal out, you can set this up to pull low when the voltage or percentage drops below a threshold. Pulled up to VIN with a 10K resistor
  • Therm - Connect a 10K thermistor to the THERM pin to read the battery pack temperature - our packs do not come with a built in thermistor but many do. The other side of the thermistor goes to ground.

LED Trace on the Back of the Breakout

There are two pads connected by a trace on the back of the board, labeled LED. If you want to conserve power when running only on battery, you can cut this trace to disable the LED on the breakout.

This guide was first published on Sep 09, 2020. It was last updated on Jul 13, 2024.

This page (Pinouts) was last updated on Mar 08, 2024.

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