Datasheet

1. General description
The PCF8591 is a single-chip, single-supply low-power 8-bit CMOS data acquisition
device with four analog inputs, one analog output and a serial I
2
C-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 I
2
C-bus without additional hardware.
Address, control and data to and from the device are transferred serially via the two-line
bidirectional I
2
C-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 I
2
C-bus.
2. Features and benefits
 Single power supply
 Operating supply voltage 2.5 V to 6.0 V
 Low standby current
 Serial input and output via I
2
C-bus
 I
2
C address selection by 3 hardware address pins
 Max sampling rate given by I
2
C-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.
3. Applications
 Supply monitoring
 Reference setting
 Analog control loops
PCF8591
8-bit A/D and D/A converter
Rev. 7 — 27 June 2013 Product data sheet