FLASH SALE!   🛍️   Get a stonking 40% off Inventor 2040 W – an all-in-one board for making contraptions that can move, sense things, make noise, and talk to the internet!!

A/D D/A Converter Module PCF8591

by Velleman

This PCF8591 module is a monolithically integrated, low-power, 8-bit CMOS data acquisition device. The PCF8591 has four analog inputs, one analog output and a serial I2C bus interface.

For testing purposes, the module contains a phototransistor, NTC and a trimmer which are connected to the PCF8591 by 3 jumpers.


  • single power supply
  • operating supply voltage 2.5 V to 6.0 V
  • low standby current
  • serial input and output via I2C-bus
  • max sampling rate given by I2C-bus speed
  • 4 analog inputs configurable as single ended or differential inputs
  • auto-incremented channel selection
  • analog voltage range from VSS to VDD
  • on-chip track and hold circuit
  • 8-bit successive approximation A/D conversion
  • multiplying DAC with one analog output