Philips Semiconductors
Product specification
8-bit A/D and D/A converter
5
BLOCK DIAGRAM
PCF8591
handbook, full pagewidth
SCL
SDA
A0
A1
A2
EXT
VDD
VSS
OSC
I
2
C BUS
INTERFACE
PCF8591
STATUS
REGISTER
DAC DATA
REGISTER
ADC DATA
REGISTER
POWER ON
RESET
OSCILLATOR
CONTROL
LOGIC
AIN0
AIN1
AIN2
AIN3
ANALOGUE
MULTIPLEXER
SAMPLE
AND
HOLD
COMPARATOR
SUCCESSIVE
APPROXIMATION
REGISTER/LOGIC
AOUT
SAMPLE
AND
HOLD
DAC
VREF
AGND
MBL821
Fig.1 Block diagram.
6
PINNING
SYMBOL
PIN
1
2
handbook, halfpage
DESCRIPTION
analog inputs (A/D converter)
AIN0 1
AIN1 2
16 VDD
15 AOUT
14 VREF
13 AGND
AINO
AIN1
AIN2
AIN3
A0
A1
A2
V
SS
SDA
SCL
OSC
EXT
AGND
V
REF
AOUT
V
DD
3
4
5
6
7
8
9
10
11
12
13
14
15
16
negative supply voltage
I
2
C-bus data input/output
I
2
C-bus clock input
oscillator input/output
external/internal switch for
oscillator input
analog ground
voltage reference input
analog output (D/A converter)
positive supply voltage
hardware address
AIN2 3
AIN3 4
PCF8591P
A0 5
A1 6
A2 7
VSS 8
MBL822
12 EXT
11 OSC
10 SCL
9
SDA
Fig.2 Pinning diagram (DIP16).
2003 Jan 27
4
PHILIPS [ NXP SEMICONDUCTORS ]
