Datasheet

0.8" 8x8 Matrix

This version of the LED backpack is designed for these very cute miniature 8x8 matrices. They measure only 0.8"x0.8"

so its a shame to use a massive array of chips to control it. This backpack solves the annoyance of using 16 pins or a

bunch of chips by having an I2C constant-current matrix controller sit neatly on the back of the PCB. The controller

chip takes care of everything, drawing all 64 LEDs in the background. All you have to do is write data to it using the 2-

pin I2C interface. There are two address select pins so you can select one of 4 addresses to control up to 4 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 8x8

matrix in one of the colors we provide (say, red, yellow

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. It can go 'either way' -

the matrix is symmetric so as long as it goes onto the

front it will work in any orientation. Do not solder the

matrix over the chip on the back of the backpack - it will

not work then!

These instruction apply to the 0.8" Matrix only! If you have a Bi-Color or 1.2" square matrix, follow the links on

the left side of the page.