PCF8591 8 bit AD or DA converter
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It has 4 analog inputs and one analog ouput and an I2C interface for interfacing to embedded systems. 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 bidirectional I2C-bus.