PCA8581T/F6L View Datasheet(PDF) - Philips Electronics
Part Name
Description
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PCA8581T/F6L Datasheet PDF : 20 Pages
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Philips Semiconductors
128 × 8-bit EEPROM with I2C-bus interface
Product specification
PCA8581; PCA8581C
To transmit eight bytes in sequential order, begin with the lowest address bits 0 0 0. The data is written after a stop is
detected. The data is only written if complete bytes have been received and acknowledged. Writing takes a time tWR
(6 to 10 ms) during which the device will not respond to its slave address. Note that to write the next row, a new write
operation is required (start, slave address, row address, data and stop).
handbook, full pagewidth
acknowledgement
from slave
acknowledgement
from slave
acknowledgement
from slave
acknowledgement
from master
S SLAVE ADDRESS 0 A X WORD ADDRESS A S SLAVE ADDRESS 1 A
R/W don't
care
at this moment master -
R/W
transmitter becomes
master - receiver and
PCA8581(C) slave - receiver
becomes slave - transmitter
DATA
A
n bytes
auto increment
memory word address
no acknowledgement
from master
MLB891
DATA
1P
last byte
auto increment
memory word address
Fig.9 Master reads after setting word address (WRITE word address; READ data).
handbook, full pagewidth
acknowledgement
from slave
acknowledgement
from slave
acknowledgement
from slave
S SLAVE ADDRESS 1 A
DATA
A
DATA
1P
R/W
n bytes
auto increment
word address
last bytes
auto increment
word address
MBD824
Fig.10 Master reads slave immediately after first byte (READ mode).
An unlimited number of data bytes can be read in one operation. The address is automatically incremented. If a read
without setting the word address is performed after a write operation, the address pointer may point at a byte in the row
after the previously written row. This occurs if, during writing, the three lowest address bits (column) rolled over.
1997 Apr 02
8
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