MAX6959 and I2C

Using Arduino Networking, Protocols, and Devices
2

You can use the following code to set the value of every digit:

byte d[] = { 0x7e, 0x60, 0x6d, 0x79, 0x33, 0x5b, 0x1f, 0x70, 0x7f, 0x7b };
void set_digit(byte digit, byte value) {
  Wire.beginTransmission(0x38);
  Wire.write(0x20 + digit);
  Wire.write(d[value]);
  Wire.endTransmission();
}