Datasheet

We have multiple tri-color displays. They have black and red ink pixels and a white-ish background. Using our Arduino

library, you can create a 'frame buffer' with what pixels you want to have activated and then write that out to the

display. Most simple breakouts leave it at that. But if you do the math, using even the smallest 1.54" display: 152 x 152

pixels x 2 colors = 5.7 KBytes. Which won't fit into many microcontroller memories. Heck, even if you do have 32KB of

RAM, why waste 6KB?

So we did you a favor and tossed a small SRAM chip on the back. This chip shares the SPI port the eInk display uses,

so you only need one extra pin. And, no more frame-buffering! You can use the SRAM to set up whatever you want to

display, then shuffle data from SRAM to eInk when you're ready. The library we wrote does all the work for

you (https://adafru.it/BRK), you can just interface with it as if it were an Adafruit_GFX compatible

display (https://adafru.it/BRK).