Datasheet

1.2" 7-segment Backpack

These backpacks drive the massive 1.2" 7-segment modules. With 2 leds per segment these make a gorgeous and

impressive display. The 7-segment displays normally require 16 pins to drive. This backpack uses an I2C constant-

current matrix controller on the back of the PCB, so you only need 2 pins to drive it!

The controller chip takes care of multiplexing all the LEDs in the background. All you have to do is write data to it using

the 2-pin I2C interface. There are three address select pins so you can select one of 8 addresses to control up to 8 of

these on a single 2-pin I2C bus (as well as whatever other I2C chips or sensors you like). The driver chip can 'dim' the

entire display from 1/16 brightness up to full brightness in 1/16th steps. It cannot dim individual LEDs, only the entire

display at once.

When you buy a pack from Adafruit, it comes with the

fully tested and assembled backpack as well as a 7-

segment display in one of the colors we provide (say,

red, yellow, blue or green). You'll need to solder the

matrix onto the backpack but its an easy task.

Remove the parts from packaging and place the LED

matrix OVER the silkscreen side. DO NOT PUT THE

DISPLAY ON UPSIDE DOWN OR IT WONT WORK!!

Check the image below to make sure the 'decimal

point' dots are in the same location as the ones on the

silkscreen.