NXP Semiconductors
PCF8591
8-bit A/D and D/A converter
The conversion result is stored in the ADC data register and awaits transmission. If the
auto-increment flag is set, the next channel is selected.
The first byte transmitted in a read cycle contains the conversion result code of the
previous read cycle. After a POR condition, the first byte read is 80h. The protocol of an
I
2
C-bus read cycle is shown in
The maximum A/D conversion rate is given by the actual speed of the I
2
C-bus.
HEX
code
FF
FE
V
REF
−
V
AGND
256
V
lsb
=
04
03
02
01
00
0
1
2
3
4
254
255
V
AIN
−
V
AGND
V
lsb
mbl830
Fig 9.
A/D conversion characteristics of single ended inputs
PCF8591
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© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 7 — 27 June 2013
9 of 31
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