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    The AT8591 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 bidirectional I2C-bus.

    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.


  • Single power supply

  • Operating supply voltage 2.5 V to 6.0 V

  • Low standby current

  • Serial input and output via I2C-bus

  • I2C address selection by 3 hardware address pins

  • 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.


  • Supply monitoring

  • Reference setting

  • Analog control loops

Block diagram