interface with 3 rows of 4 7-segment display using i2c?

Datasheet doesn't make it look too bad. Only a handful of commands, and it doesn't look like it wants you to do any particularly weird stuff. Looks like the module'd be pretty easy to write.

Writing off the top of my head looking at the datasheet, I'd start like

exports.connect = function(i2c,address,) {
    return new HT16K33(i2c,range);
}

function HT16K33(i2c,address) {
  this.i2c = i2c;
  this.a=(address?address:0x70);
}

HT16K33.prototype.send = function(data){
	this.i2c.writeTo(this.a,0x00,data);
}

HT16K33.prototype.setBrightness = function(bright){
	this.i2c.writeTo(this.a,0xE0+E.clip(0,bright,16));
}

HT16K33.prototype.setDisplay = function(on,blink) { //blink - 0 = no blink, 1=2 blink per second, 2=1 blink per second, 3=1 blink per 2 second
	this.i2c.writeTo(this.a,0x80+(on?1:0)+(E.clip(0,blink,3)<<1));
}