pca9691 NXP Semiconductors, pca9691 Datasheet - Page 9

• Manufacturer Part Number: pca9691
• Description: 8-bit A/d And D/a Converter
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9691_1
Product data sheet
Fig 8.
protocol
V
AOUT
SDA
SCL
D/A conversion sequence
S
7.3.1 Worst case example
1
ADDRESS
An example of the worst case is shown in
between 8T
When the I
9 s.
The previous AOUT value is valid at least until the rising edge of the acknowledge bit
(8T
The latest start time of the new value is 5.6 s from the rising edge of the acknowledge bit:
(18T
Fig 7.
2
previous value held in DAC register
osc
osc
high-impedance state of
1.23 s).
DAC data and DC conversion characteristics
0
5.6 s) so AOUT is stable after t
8
2
osc
C-bus is driven at 1 MHz (full speed) then the DAC is operating at a rate of
and 18T
A
9
V
CONTROL BYTE
AOUT
V
V
1
AGND
VREF
V
osc
V
Rev. 01 — 8 April 2008
DD
SS
.
00
V
MSB
01 02 03 04
AOUT
D7 D6 D5 D4 D3 D2 D1 D0
8
t
d
= V
A
9
AGND
t
c(DAC)
s(DAC)
Figure
+
DATA BYTE 1
1
V
VREF
previous value held
in DAC register
256
9. The delay time can have a value
2.4 s.
V
AGND
8
i = 0
t
7
d
Di
LSB
A
9
8-bit A/D and D/A converter
2
DAC data
register
i
DAC (hex)
001aag468
t
c(DAC)
FE FF
DATA BYTE 2
1
PCA9691
value of data byte 1
© NXP B.V. 2008. All rights reserved.
8
001aag469
A
time
9
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