Description

      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.

Features

• 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 V_SS to V_DD

• On-chip track and hold circuit

• 8-bit successive approximation A/D conversion

• Multiplying DAC with one analog output.

Applications

• Supply monitoring

• Reference setting

• AnalogTEK control loops

Block diagram