PCF8591P

Philips Semiconductors Product specification
8-bit A/D and D/A converter PCF8591
1 FEATURES
• Single power supply • Operating supply voltage 2.5 V to 6 V • Low standby current • Serial input/output via I2C-bus • Address by 3 hardware address pins • Sampling rate given by I2C-bus speed • 4 analog inputs programmable 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.
2 APPLICATIONS
• Closed loop control systems • Low power converter for remote data acquisition • Battery operated equipment • Acquisition of analog values in automotive, audio and TV applications.
3 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 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.
4 ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME DESCRIPTION VERSION
PCA8591P DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 PCA8591T SO16 plastic small outline package; 16 leads; body width 7.5 mm SOT162-1
1998 Jul 02 4
Philips Semiconductors Product specification
8-bit A/D and D/A converter PCF8591
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5 BLOCK DIAGRAM
Fig.1  Block diagram.
1998 Jul 02 5
Philips Semiconductors Product specification
8-bit A/D and D/A converter PCF8591
6 PINNING
SYMBOL PIN DESCRIPTION
AINO 1
analog inputs (A/D converter)
AIN1 2 AIN2 3 AIN3 4 A0 5 hardware addressA1 6 A2 7 VSS 8 negative supply voltage SDA 9 I2C-bus data input/output SCL 10 I2C-bus clock input OSC 11 oscillator input/output EXT 12 external/internal switch for oscillator input AGND 13 analog ground VREF 14 voltage reference input AOUT 15 analog output (D/A converter) VDD 16 positive supply voltage
Fig.2  Pinning diagram.