The PCF8591 is a single-chip, single-supply low-power 8-bit CMOS data acquisition
device with four analog inputs, one analog output and a serial I2C-bus interface. Three
address pins A0, A1 and A2 are used for programming the hardware address, allowing
the use of up to eight devices connected to the I2C-bus without additional hardware.
Address, control and data to and from the device are transferred serially via the two-line
The functions of the device include analog input multiplexing, on-chip track and hold
function, 8-bit analog-to-digital conversion and an 8-bit digital-to-analog conversion. The
maximum conversion rate is given by the maximum speed of the I2C-bus.
This is an I2C Analog to Digital Converter project. A Raspberry Pi employing the PCF8591 Analog to Digital Converter (ADC). This project show how to read write to the chip's 4 analog inputs (ADC) and one analog output or Digital to Analog Converter (DAC).John's Linux Blog - Wednesday, December 19, 2012 - I2C Analog to Digital Converter: