I2C what it mean: http://www.ti.com/lit/an/slva704/slva704.pdf address of device seems to be 0x1A and not 0x34 as reported by datasheet via i2cdetect: pi@raspberrypi:~ $ i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: – – – – – – – – – – – – – 10: – – – – – – – – – – 1a – – – – – 20: – – – – – – – – – – – – – – – – 30: – – – – – – – – – – – – – – – – 40: – – – – ...