Philips Semiconductors
Product specification
8-bit A/D and D/A converter
PCF8591
handbook, full pagewidth
msb
D7
D6
D5
D4
D3
D2
D1
lsb
D0
DAC data
register
MBL827
VAOUT
VDD
VREF
VAOUT = VAGND
+
VREF - VAGND 7
∑
Di
×
2i
256
i=0
VAGND
VSS
00
01
02
03
04
HEX code
FE
FF
Fig.7 DAC data and DC conversion characteristics.
handbook, full pagewidth
MBL828
PROTOCOL
S
ADDRESS
0
A
CONTROL BYTE
A
DATA BYTE 1
A
DATA BYTE 2
A
SCL
1
2
8
9
1
9
1
9
1
SDA
VAOUT
high impedance state or
previous value held in DAC register
previous value held in
DAC register
value of data byte 1
time
Fig.8 D/A conversion sequence.
2003 Jan 27
8