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PCA8581P Datasheet(PDF) 7 Page - NXP Semiconductors

Part # PCA8581P
Description  128 x 8-bit EEPROM with I2C-bus interface
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA8581P Datasheet(HTML) 7 Page - NXP Semiconductors

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1997 Apr 02
7
Philips Semiconductors
Product specification
128
× 8-bit EEPROM with I2C-bus interface
PCA8581; PCA8581C
7.5
I2C-bus protocol
Before any data is transmitted on the I2C-bus, the device which should respond is addressed first. The addressing is
always carried out with the first byte transmitted after the start procedure. The I2C-bus configuration for the different
PCA8581 WRITE and READ cycles is shown in Figs 7, 9 and 10.
After the word address, one-to-eight data bytes can be sent. The address is automatically incremented, but the four
highest address bits (row) are internally latched. Therefore all bytes are written in the same row.
An example of writing eight bytes with word address X 0 0 00000 and six bytes with word address X 0010101 is
shown in Fig.8.
Fig.7 Master transmits to slave receiver (WRITE) mode.
handbook, full pagewidth
S
0A X
SLAVE ADDRESS
WORD ADDRESS
A
A
DATA
P
acknowledgement
from slave
acknowledgement
from slave
acknowledgement
from slave
WRITING
R/W don't
care
auto increment
memory word address
MLB889
n bytes
t WR
Fig.8 Writing eight and six bytes with different word addresses.
(1) X = don’t care.
handbook, full pagewidth
MLB890
Word Address
(1)
Row
0
1
2
3
column
1
4
2
5
3
6
4
5
6
1
7
2
8
3
01
23
45
67
X0000000
X0001...
X0010101
X0011...


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