The PCF8591 is a singlechip, singlesupply, lowpower data acquisition device featuring four analog inputs, one analog output, and a serial I2Cbus interface. Built in CMOS technology, it provides 8bit data resolution across its input and output channels. Key benefits Flexible I2C addressing: A0, A1 and A2 pins configure the hardware address, enabling up to eight devices on the same I2C bus without extra hardware. Simple serial communication: All address, control, and data transfer occurs over the twoline bidirectional I2C bus, simplifying interconnection with microcontrollers. Compact, lowpower design: A single power supply powers the device, making it suitable for compact and batterypowered applications. Multichannel capability: Four analog inputs plus one analog output support a variety of sensing and control tasks with minimal component count. Key attributes Function: 4 analog input channels and 1 analog output with 8bit data resolution. Compatibility: I2Cbus interface with standard twowire serial communication; supports up to 8 devices on the bus via address pins A0A2. Size and form: singlechip CMOS device with a single power supply, designed for easy integration into compact systems. Performance: lowpower operation suitable for embedded and portable applications; serial data transfer facilitates straightforward microcontroller integration. Specifications at a glance Resolution: 8bit Analog inputs: 4 Analog output: 1 Interface: I2Cbus (twoline serial) Addressing: A0, A1, A2 pins allow up to 8 devices on the I2C bus Power: single power supply How it works The PCF8591 uses a 3bit hardware address selected by A0, A1, and A2 to form its I2C address. Address, control commands, and data to and from the device are transferred serially via the twoline I2Cbus. The device remains a singlechip CMOS solution with low power requirements, suitable for inclusion in microcontrollerbased systems. Use scenarios Multisensor data acquisition: Connect four sensors to the analog input channels and read results via I2C from a microcontroller while optionally using the analog output for reference or calibration signals. Expanded I2C sensing on a microcontroller project: Deploy multiple PCF8591 devices on the same I2C bus (up to eight total) to scale input channels without additional hardware or complex decoding logic. Prototyping and test benches: Use the PCF8591 to quickly convert analog signals for rapid testing and development, enabling a compact, lowpower measurement interface for embedded systems.